Quotes & Sayings


We, and creation itself, actualize the possibilities of the God who sustains the world, towards becoming in the world in a fuller, more deeper way. - R.E. Slater

There is urgency in coming to see the world as a web of interrelated processes of which we are integral parts, so that all of our choices and actions have [consequential effects upon] the world around us. - Process Metaphysician Alfred North Whitehead

Kurt Gödel's Incompleteness Theorem says (i) all closed systems are unprovable within themselves and, that (ii) all open systems are rightly understood as incomplete. - R.E. Slater

The most true thing about you is what God has said to you in Christ, "You are My Beloved." - Tripp Fuller

The God among us is the God who refuses to be God without us, so great is God's Love. - Tripp Fuller

According to some Christian outlooks we were made for another world. Perhaps, rather, we were made for this world to recreate, reclaim, redeem, and renew unto God's future aspiration by the power of His Spirit. - R.E. Slater

Our eschatological ethos is to love. To stand with those who are oppressed. To stand against those who are oppressing. It is that simple. Love is our only calling and Christian Hope. - R.E. Slater

Secularization theory has been massively falsified. We don't live in an age of secularity. We live in an age of explosive, pervasive religiosity... an age of religious pluralism. - Peter L. Berger

Exploring the edge of life and faith in a post-everything world. - Todd Littleton

I don't need another reason to believe, your love is all around for me to see. – Anon

Thou art our need; and in giving us more of thyself thou givest us all. - Khalil Gibran, Prayer XXIII

Be careful what you pretend to be. You become what you pretend to be. - Kurt Vonnegut

Religious beliefs, far from being primary, are often shaped and adjusted by our social goals. - Jim Forest

We become who we are by what we believe and can justify. - R.E. Slater

People, even more than things, need to be restored, renewed, revived, reclaimed, and redeemed; never throw out anyone. – Anon

Certainly, God's love has made fools of us all. - R.E. Slater

An apocalyptic Christian faith doesn't wait for Jesus to come, but for Jesus to become in our midst. - R.E. Slater

Christian belief in God begins with the cross and resurrection of Jesus, not with rational apologetics. - Eberhard Jüngel, Jürgen Moltmann

Our knowledge of God is through the 'I-Thou' encounter, not in finding God at the end of a syllogism or argument. There is a grave danger in any Christian treatment of God as an object. The God of Jesus Christ and Scripture is irreducibly subject and never made as an object, a force, a power, or a principle that can be manipulated. - Emil Brunner

“Ehyeh Asher Ehyeh” means "I will be that who I have yet to become." - God (Ex 3.14) or, conversely, “I AM who I AM Becoming.”

Our job is to love others without stopping to inquire whether or not they are worthy. - Thomas Merton

The church is God's world-changing social experiment of bringing unlikes and differents to the Eucharist/Communion table to share life with one another as a new kind of family. When this happens, we show to the world what love, justice, peace, reconciliation, and life together is designed by God to be. The church is God's show-and-tell for the world to see how God wants us to live as a blended, global, polypluralistic family united with one will, by one Lord, and baptized by one Spirit. – Anon

The cross that is planted at the heart of the history of the world cannot be uprooted. - Jacques Ellul

The Unity in whose loving presence the universe unfolds is inside each person as a call to welcome the stranger, protect animals and the earth, respect the dignity of each person, think new thoughts, and help bring about ecological civilizations. - John Cobb & Farhan A. Shah

If you board the wrong train it is of no use running along the corridors of the train in the other direction. - Dietrich Bonhoeffer

God's justice is restorative rather than punitive; His discipline is merciful rather than punishing; His power is made perfect in weakness; and His grace is sufficient for all. – Anon

Our little [biblical] systems have their day; they have their day and cease to be. They are but broken lights of Thee, and Thou, O God art more than they. - Alfred Lord Tennyson

We can’t control God; God is uncontrollable. God can’t control us; God’s love is uncontrolling! - Thomas Jay Oord

Life in perspective but always in process... as we are relational beings in process to one another, so life events are in process in relation to each event... as God is to Self, is to world, is to us... like Father, like sons and daughters, like events... life in process yet always in perspective. - R.E. Slater

To promote societal transition to sustainable ways of living and a global society founded on a shared ethical framework which includes respect and care for the community of life, ecological integrity, universal human rights, respect for diversity, economic justice, democracy, and a culture of peace. - The Earth Charter Mission Statement

Christian humanism is the belief that human freedom, individual conscience, and unencumbered rational inquiry are compatible with the practice of Christianity or even intrinsic in its doctrine. It represents a philosophical union of Christian faith and classical humanist principles. - Scott Postma

It is never wise to have a self-appointed religious institution determine a nation's moral code. The opportunities for moral compromise and failure are high; the moral codes and creeds assuredly racist, discriminatory, or subjectively and religiously defined; and the pronouncement of inhumanitarian political objectives quite predictable. - R.E. Slater

God's love must both center and define the Christian faith and all religious or human faiths seeking human and ecological balance in worlds of subtraction, harm, tragedy, and evil. - R.E. Slater

In Whitehead’s process ontology, we can think of the experiential ground of reality as an eternal pulse whereby what is objectively public in one moment becomes subjectively prehended in the next, and whereby the subject that emerges from its feelings then perishes into public expression as an object (or “superject”) aiming for novelty. There is a rhythm of Being between object and subject, not an ontological division. This rhythm powers the creative growth of the universe from one occasion of experience to the next. This is the Whiteheadian mantra: “The many become one and are increased by one.” - Matthew Segall

Without Love there is no Truth. And True Truth is always Loving. There is no dichotomy between these terms but only seamless integration. This is the premier centering focus of a Processual Theology of Love. - R.E. Slater

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Note: Generally I do not respond to commentary. I may read the comments but wish to reserve my time to write (or write off the comments I read). Instead, I'd like to see our community help one another and in the helping encourage and exhort each of us towards Christian love in Christ Jesus our Lord and Savior. - re slater

Monday, April 13, 2020

What Does Whitehead Mean by "Feelings" (sic, Positive & Negative Prehensions)



Whitehead on Feelings

by Steven Shaviro
June 8, 2015

Here is the text of the talk I gave this past week at the International Whitehead Studies conference in Claremont, California. It is a bit rough and fragmentary, and it doesn’t have a proper conclusion. But since I do not know when, or even if, I will expand it into a proper article, I am posting it here.

I am especially interested in what Whitehead calls feeling. The word is everywhere in Process and Reality. But it is not necessarily used in the ways we might expect. Whitehead insists that "the word feeling is a mere technical term." He says that he is using it in order to designate "that functioning through which the concrescent actuality appropriates the datum so as to make it its own." At another point, Whitehead defines feeling as "the term used for the basic generic operation of the actual entity in question. Feelings are variously specialized operations, effecting a transition into subjectivity."

In other words, "feeling" for Whitehead means capture and appropriation, and the form of subjectivity that arises from all this. Feeling as "a mere technical term" is pretty much equivalent to what Whitehead elsewhere calls prehension: a more unusual word that doesn’t have common-language connotations (although we recognize it in composite words like apprehension and comprehension). Strictly speaking, a feeling is a positive prehension; Whitehead contrasts this to negative prehension, a mode in which things are not felt, but rather "eliminate[d] from feeling." Positive and negative prehensions are the way that any entity constitutes itself in the process of responding to other entities that precede it. In every encounter, you either feel whatever it is that you have encountered, or else you actively reject it from feeling. Most importantly, an entity encounters, feels, and picks up from, its own state of being in the immediate past, which is to say in "time-spans of the order of magnitude of a second, or even of fractions of a second." But an entity also encounters other entities in its vicinity. And ultimately, an entity encounters – at least to some extent, though quite often this extent is "negligible" – its entire world, which is to say, in the terminology of physics, everything within the light cone of the entity.

Explicitly specifying that "feeling" is just a technical term is a way of warning us that we shouldn’t take it as anthropomorphically as we normally would. On Whitehead’s account, a tree has feelings – but they are probably quite different from the feelings that human beings have. A tree may feel assaulted, for instance; we know that trees (and other plants) release pheromones when insects start eating their leaves. These emissions both act as a chemical attack on the predator, and warn other trees (or, indeed, other parts of the same tree) to take defensive measures as well. It is not ridiculous, therefore, to claim that a tree has feelings. However, it is unlikely that a tree would ever feel insulted or humiliated – these are human feelings that have no place in the life of trees.

Of course, if Whitehead had really wanted to separate the concept of feeling entirely from our human sense of the term, he could have avoided the word entirely – since it is already synonymous to the technical term prehension. That way he could have easily sidestepped all this baggage of already-existing connotations. Since he didn’t, I must assume that Whitehead wanted to draw on that baggage – even though he also pushes it aside by claiming to be using "a mere techincal term." Why might this be? Whitehead wants us to expand our idea of what feelings are beyond the human context; but at the same time he does not want to completely separate it from human experience. The feelings of a tree are quite different from the feelings of human beings, but there is nonetheless a certain degree of affinity between them.

This, of course, is the point at which many people will accuse Whitehead of anthropmorphism and projection. We can respond to this objection with Jane Bennett’s maxim that anthropomorphism helps us to avoid the far worse problems of anthropocentrism. After all, she notes, "too often the philosophical rejection of anthropomorphism is bound up with a hubristic demand that only humans and God can bear any traces of creative agency." In other words, attributing feeling to trees helps to shake us from our all-too-human, self-congratulatory belief that we are totally unlike all other entities: such as Robert Brandom’s view that we are sapient, whereas other living things are merely sentient. But actually, I don’t think that Whitehead is being anthropomorphic at all: rather, he is inverting the direction of anthropomorphic projections. For Whitehead, human feelings are in fact the exemplification, within our own experience, of a broader kind of process that is far more widely distributed among entities in the world. I cannot remember who first said this, but Whitehead’s actual procedure is – far from attributing human qualities to other organisms – to try to find more general processes, of which the human version that we are familiar with is just one, not necessarily privileged, example. Whitehead’s procedure is actually what Charles Sanders Peirce calls abduction.

Nonetheless, even with all these explanations, Whitehead’s use of feeling as a mere techincal term remains a bit counter-intuitive. He shores up his position by appealing to a number of philosophical precedents. He says that "this use of the term ‘feeling’ has a close analogy to Alexander’s use of the term ‘enjoyment’; and has also some kinship with Bergson’s use of the term ‘intuition.’ (Just as an aside, I wonder whether it might be a good idea to go back and look at Samuel Alexander’s Space, Time, and Deity: I have never read it, but Whitehead clearly thinks highly of it, and Deleuze mentions it in passing as a great book).

In any case, Whitehead also – and more surprisingly than with his citations of Alexander and Bergson – closely associates his use of the word feeling with Descartes’ use of the equivalent Latin term sentire. Didier Debaise discusses this connection in his new book L’appât des possibles. For Descartes, sentire, the act of feeling, is the one indubitable fact of existence – my cogito really reduces to a sentio, since even if the content of the feeling is delusive, the fact of having a feeling is not. (Debaise implicitly draws on Deleuze and Guattari’s substitution of sentio for cogito). (It is worth noting that Whitehead quite frequently draws from the history of philosophy in this way; he find precedents by isolating crucial propositions from an earlier thinker whose general, overall position is entirely opposed to his own).

I am entirely convinced by Debaise’s reading, which is deeper and more complex than what I have space to discuss here. But I would like to point to another, equally odd philosophical borrowing in Whitehead’s discussion of feeling. After citing Alexander and Bergson, and before moving on to Descartes, Whitehead notes that "a near analogy [for his own use of the term ‘feeling’] is Locke’s use of the term ‘idea’, including ‘ideas of particular things’." The qualification of "particular things" is important. At several points in Process and Reality, Whitehead notes how – even though this contradicts Locke’s overall sensationalism – Locke nonetheless speaks of ideas that are "determined to one particular existent." What this means, for Whitehead, is that "in some sense one actual existent repeats itself in another actual existent." There is a lot to unpack here. I will only note two things. In the first place, an entity prehends, or feels, an entire prior entity: meaning the entity as a whole, rather than just its particular qualities. I see a tree, not just an aggregation of points of green (leaves) and grey (bark). I feel the entity itself, as well as feeling its "secondary qualities" (which are what Whitehead calls eternal objects). The "data" that we perceive are not just atomistic impressions; rather, "the datum includes its own interconnections."

In the second place, when Whitehead says that an entity "repeats itself", he means that entities do not just represent other entities, or the sensa emitted by other entities, as private mental pictures: rather, the earlier entity really is present in a certain way in the later one. I discuss this at length in my article "Whitehead on Causality and Perception." For Whitehead, causality and perception are the same thing. Or, more precisely: when an entity perceives another entity, this means that it is being affected by that other entity; perception in this way is a subset of being-affected in general, since entities also affect other entities in ways that are not immediately perceived; the sum of all these affections are what we mean by causality. As Michael Halewood mentioned to me, this means that Whitehead understands causality , not as a "law of nature," but rather as the tendency for the present to conform to the immediate past. Such is the baseline, or basic condition, of becoming for Whithead; although it is partly overcome when an entity introduces novelty in its prehension of a previous entity, rather than merely conforming to it.

There are several other places in Progress and Reality where Whitehead refers his own notion of feeling to Locke’s notion of ideas. For instance:

the terms ‘prehension’ and ‘feeling’ are to be compared with the various significations of Locke’s term ‘idea.’ But they are adopted as more general and more neutral terms than ‘idea’ as used by Locke, who seems to restrict them to conscious mentality.

And again:

Locke’s term idea, in his primary use of it in the first two books of the Essay, means the determinate ingression of an eternal object into the actual entity in question. But he also introduces the limitation to conscious mentality, which is here abandoned."

The important point here is that subjective experience need not involve, and can be detached from, consciousness. On the one hand, Whitehead catergorically insists that "apart from the experiences of subjects there is nothing, nothing, nothing, bare nothingness." But he also continually reminds us that most of this "experience of subjects" is nonconscious. We feel more than we can know. And many organisms feel events in the world, without necessarily being conscious of what they feel. Trees for instance, have feelings, as many recent studies have shown (see, for instance, What a Plant Knows, by Daniel Chamovitz). Trees sense and feel the sunlight; they sense and feel water in the ground; they sense and feel when insects eat their leaves. But none of this necessarily means that trees are overtly conscious; most likely, they are not.

Whitehead’s distinction between feeling and consciousness helps to illuminate certain deadlocks in the contemporary philosophy of mind. Many philosophers – David Chalmers is a good example – insist upon a supposed special quality of consciousness, its irreducibility to physical process. Other philosophers – Daniel Dennett for example – deny that consciousness has any special qualities; but in giving a fully physical explanation, they end up by explaining it away. Galen Strawson has recentlly suggested that both positions are fallacious. On the one hand, there is no evidence, in the mind or elsewhere, for anything that transcends the physical. On the other hand, though, we don’t really know everything that physical processes or materiality can do; there is no ground for claiming that physicality somehow excludes mentality. I am inclined to agree with Strawson here; but the larger, Whiteheadian point is that the issue gets entirely confused when we simply equate mentality with consciousness. Neurobiologists have shown that many and perhaps most mental processes occur nonconsciously, and may well be absoutely inaccessible to consciousness. But we need not assume, as neurobiologists and philosophers of mind generally do, that all this nonconscious mental activitty can rightly be described as computation. Whitehead’s discussion of feeling gives us a broader picture of mental functioning than cognitive psychology does. I cannot develop this here, but my hunch is that feeling in this sense is a necessary precondition for cognition, but is not in itself cognitive.



Additional References




[What is a] Prehension 



Through Whitehead's category of prehension, the nonsensory sympathetic perception of antecedent experiences, we are able to reduce several apparently very different types of relations to one fundamental type of relation. [It] explains not only memory and perception, . . . but also temporality, space, causality, enduring individuality (or substance), the mind-body relation, the subject-object relation in general, and the God-world relation. David Ray Griffin, "Charles Hartshorne," in David Ray Griffin, John B. Cobb, Jr., Marcus P. Ford, Pete A. Y. Gunter, and Peter Ochs, Founders of Constructive Postmodern Philosophy: Peirce, James, Bergson, Whitehead, and Hartshorne (Albany: State University of New York Press, 1993), p. 209. Griffin's writing in this book is quoted extensively in "Charles Hartshorne's Psychicalism"

Sorry, those of you who got here from A Practical Spirituality: Process New Thought; avoiding prehending is impossible. It is not the whole story to say that that page or anything else is powered by prehension, but no actuality can exist without it, and it may suggest more of a sense of power than the other ingredient in any act of co-creation: intelligent free selection from among the two types of realities prehended (felt, taken in, appropriated): (1) the completed experiences that constitute the past and (2) the perfect possibilities provided by God for newness. Prehension is the basic, extrasensory awareness, or grasping, that all experiences have of all earlier experiences. One might call it the super intuition on which all conventionally recognized extrasensory perception and sensory perception are built. 

If it seems as if too much emphasis is given to experience, that is because there is nothing actual but experiences. Process thought, or process philosophy, sometimes is called panexperientialism--all is experience. Alfred North Whitehead wrote that apart from experiences "there is nothing, nothing, nothing, bare nothingness [Whitehead, Process and Reality, p. 254, corrected ed. p. 167]." What we take to be solid things are, as science recognizes, only collections of bursts of energy, or activity or process, which Whitehead interpreted as living experiences (occasions of experience, actual entities). Even souls are rapid successions of experiences, rather than some enduring nonmaterial substance that has experiences.

Charles Hartshorne says of Whitehead's theory of prehension: 

In a single conception it explains the spatiotemporal structure of the world, the possibility of knowledge, and the reality of freedom. It is, in my opinion, one of the supreme intellectual discoveries. Whitehead's Philosophy: Selected Essays, 1935-1970, p. 127. 
The word "prehension" is created by dropping the first syllable from "apprehension." Prehension is a part or aspect of the more or less complex whole which is an act of awareness. It is the element of pure givenness in this act; experience as the having of an object. An experience for Whitehead is a unitary event or process termed an "actual entity" or "occasion [of experience]." Every concrete thing which is given to or prehended by an entity is a prior event or actual entity, or a group of such entities. Contemporary events are not, strictly speaking, prehended, nor are occasions subsequent to the act of prehending. Thus memory and perception are alike in that the object of both is in the past. This assimilation of perception to memory is a highly original element in the doctrine. Ibid., p. 125. 
It is amazing how many questions are answered at one blow by accepting the doctrine of prehension. Are there internal relations of events to other events? Yes, for so far as events prehend others, they are constituted by their relations to these others. Are there external relations? Yes, for so far as events are prehended by subsequent events which they do not themselves prehend, they must be independent of these; also, so far as events, being mutually contemporary, are without prehensions running either way, there is mutual independence. Is there causal connectedness? Yes, first, because the occurrence of events strictly entails that of those events which they prehend; second, because process is bound to go on, and subsequent events must have enough in common with their predecessors to be suitable prehendors for these, in order to objectify, or "pastify" them (so to speak). Finally, is there any freedom of indeterminacy in reality? Yes, and in all cases, since events never strictly depend upon or imply their precise successors. And here Whitehead furnishes perhaps the neatest, strongest argument for freedom ever proposed. The subject prehends not one but many prior actualities. (Otherwise the world would have temporal but not spatial structure.) "The many become one and are increased by one [Whitehead, Process and Reality p. 32, corrected ed. p. 21. Hartshorne refers to this as "Whitehead's Novel Intuition," in an article with that title in Whitehead's Philosophy, pp. 161-170, reprinted from George L. Kline (ed.), Alfred North Whitehead: Essays on His Philosophy, pp. 18-26]. A single new actuality contains as its data the previous many actualities; but how could the many unambiguously prescribe their own unification into a new unity? There must be an emergent or creative synthesis, to constitute not merely that but how the many are made into a new one. Determinism, I suspect, cannot get around this difficulty. The that is necessary, causally fixed, but not the how. 
Thus, Whitehead's view of givenness not only solves certain epistemological problems; it also gives an answer to Hume's skepticism about causal connections, and yet it avoids the contrary extreme, absolute idealism's denial of contingency and freedom. [At this point he gives the two sentences quoted at the beginning of this Hartshorne material]. Whitehead's Philosophy, pp. 126-27. 

Victor Lowe, in his Understanding Whitehead, p. 349, says: 

The past has had its chance at becoming; it transfers the opportunity to the next runner. The past is now there to be apprehended, but not to grow and change. The present is creatively active but is not apprehended. 

In his An Interpretation of Whitehead's Metaphysics, p. 12, William A. Christian writes: 

A prehension is an operation in which an actual entity "grasps" some other entity (actual or nonactual [see "eternal objects" on the terminology page]) and makes that entity an object of its experience. . . . A prehension is a "concrete fact of relatedness." It has a subject (the prehending actual entity), an object or datum that is prehended , and a subjective form. The subjective form of a prehension is the particular manner in which that subject prehends that object. Subjective forms are forms of emotion, consciousness, purpose, etc. A prehension need not be conscious--indeed, most prehensions are not. 
There are positive prehensions and negative prehensions. Negative prehensions "eliminate" their data, so that these data do not make a positive contribution to the experiences of the subject. A positive prehension is generally called a feeling. 
The "becoming" of an actual entity consists in a concrescence (from concrescere), a "growing together" of various details of experience into a unity. This process of concrescence is organized teleologically by the subject's subjective aim at unity of experience. The satisfaction of an actual entity is the "concrete" unity of experience which the concrescence achieves. The living experience of an actual entity is its subjective immediacy. 
Prehension of one actual entity by another means the objectification of the former for the latter. The former is then said to have "objective" existence. It exists and functions as an object, not as an experiencing subject. . . . The objective existence of an actual entity is its objective immortality. 

In the alphabetically arranged Glossary of his A Key to Whitehead's Process and Reality (Macmillan, 1966), Donald W. Sherburne writes: 

Prehensions are defined as "Concrete Facts of Relatedness [PR 32]. Prehensions are the vehicles by which one actual entity becomes objectified in another, or eternal objects obtain ingression into actual entities; they "are 'vectors'; for they feel what is there and transform it into what is here" [PR 133]. 
Prehensions are what an actual entity is composed of: "The first analysis of an actual entity, into its most concrete elements, discloses it to be a concrescence of prehensions, which have originated in its process of becoming" [PR 35]. The very nature of a prehension reveals its relational character: "Every prehension consists of three factors: (a) the 'subject' which is prehending, namely, the actual entity in which that prehension is a concrete element; (b) the 'datum' which is prehended; (c) the 'subjective form' which is how that subject prehends that datum" [PR 35]. 
Physical prehensions are prehensions whose data involve actual entities; conceptual prehensions are prehensions whose data involve eternal objects. Both physical and conceptual prehensions are spoken of as pure; an impure prehension is a prehension in a later phase of concrescence that integrates prehensions of the two pure types. A hybrid prehension is the "prehension by one subject of a conceptual prehension, or of an 'impure' prehension, belonging to the mentality of another subject" [PR 163]. A positive prehension (also termed a feeling) includes its datum as part of the synthesis of the subject occasion, but negative prehensions exclude their data from the synthesis. 
"The perceptive constitution of the actual entity presents the problem, How can the other actual entities, each with its own formal existence, also enter objectively into the perceptive con-stitution of the actual entity in question? This is the problem of the solidarity of the universe. The classical doctrines of universals and particulars, of subject and predicate, of individual substances not present in other individual substances, of the externality of relations, alike render this problem incapable of solution. The answer given by the organic philosophy is the doctrine of prehen-sions, involved in concrescent integrations, and terminating in a definite, complex unity of feeling" [PR 88-89]. 
Whitehead acknowledges an indirect debt to Leibniz in his use of this term. Leibniz employed the terms perception and apperception for the lower and higher ways, respectively, that one monad can take account of another, can be aware of another. While needing a set of terms like this, Whitehead does not wish to utilize the identical terminology, for as used by Leibniz the terms are inextricably bound up with the notion of representa-tive perception, which Whitehead rejects. But there is the similar term apprehension, meaning "thorough understanding," and, using the Leibnizian model, Whitehead coins the term prehension to mean the general, lower way, devoid of any suggestion of either consciousness or representative perception, in which an occasion can include other actual entities, or eternal objects, as part of its own essence. 

Peter Farleigh, in his "Whitehead's Even More Dangerous Idea", says: 

Having established in general what Whitehead's 'actual occasions' are, some explanation of their nature needs to be made. It might be thought that such an explanation is to be found by starting at the bottom and working up from there. In fact, the place to start, and the place that Whitehead wants us to start, is at the level of human experience. For two reasons: first, because human experience at any moment is itself, an actual occasion, and the occasion we know better than any other, and known from the inside. Second, because high-level occasions are themselves highly coordinated societies of low-level occasions, certain features of human experiential events can be generically applied to more primitive occasions. 
Consider the act of perception. It is by perception, and this involves cognition, intentionality and affective tone, that we take account of our environment. I look at a pencil in front of me, for example. I have an immediate sense of its overall look-its shape, its length, its color. The pencil is set against a background of my desk and other things in my field of vision, but not things I am at that moment acutely aware of. Also I am only vaguely aware of my body and its relation to the desk and pen. In seeing the pencil, too, whole streams of associative memories are stirred. All of these perceptions and memories are gathered together into the unity, which is this single percipient event-a 'specious present'. The focal point or center of this event being my body. The pencil and the background, as well as the memories, are all internal constituents of my experience, and are therefore causally efficacious of that experiential event. They are said to be internally related to this event. Those objects at that moment are unaffected by my act of perception and so are said to be externally related to the event. 
The act of perception then, establishes the causal relation of a subject to the external world at that moment. Perception and memory recall for Whitehead are high level instances of a more general concept, which he calls prehension. Most simply, for a subject to prehend an object, it is to experience it, perceive it, feel it, or 'take it into account,' though not necessarily in a conscious or reflective way. An object can be a physical object, like a pencil, or a conceptual object like a memory. Prehension is also a feature at lower levels of nature. Single cells 'feel' or take account of their environment (which is often other cells). Within a series of sub-atomic events, each event prehends its antecedent event, and is almost entirely determined by it.
The concept of prehension does sound a lot like the more familiar concept of intentionality. Indeed, Nicholas Gier has examined in depth the relations between the two concepts. Gier points out their similarities: "Both prehension and intentionality describe the relationship of a subject and an object in such a way as to overcome this subject­object split. In the same way that intentionality is always 'consciousness of an object,' prehension is always 'feeling of' some datum. This means that any prehensive unification or intentional act is codetermined by the respective data." (Gier 1976) One major difference is that intentionality is only discussed in terms of human consciousness, while prehension is extended far beyond the human realm. Both affirm a doctrine of internal relations so that consciousness is never simply 'there' without content or object, but with phenomenology the relationship of consciousness and its object is not considered a causal one. Whitehead had solved this problem of causation with his doctrine of asymmetrical relations between a present event and its past. Lewis Ford sums up the comparison by stating "Rather than being simply identical with intentionality, prehension generalizes both intentionality and causality, thus unifying both phenomenology and science." (Gier 1976 [Gier, N. 1976 "Intentionality and Prehension," Process Studies Vol. 6 No. 3]) 

In his Science and the Modern World, pp. 101-106 (paperback edition 69-72), Alfred North Whitehead writes: 

The word perceive is, in our common usage, shot through and through with the notion of cognitive apprehension. So is the word apprehension, even with the adjective cognition omitted. I will use the word prehension for uncognitive apprehension: by this I mean apprehension which may or may not be cognitive.
. . . For Berkeley's mind, I substitute a process of prehensive unification. . . . In the first place, note that the idea of simple location has gone. The things which are grasped into a realised unity, here and now, are not the castle, the cloud, and the planet simply in themselves; but are the castle, the cloud, and the planet from the standpoint , in space and time, of the prehensive unification. In other words, it is the castle over there from the standpoint of the unification here. It is, therefore, the castle, the cloud, and the planet which are grasped in unity here. You will remember that the idea of perspectives is quite familiar in philosophy. It was introduced by Leibniz, in the notion of his monads mirroring perspectives of the universe. I am using the same notion, only I am toning down his monads into the unified events [in later Whitehead writings, actual entities or occasions of experience]in space and time. . . . In the analogy with Spinoza, his one substance is for me the one underlying activity of realisation . . . Thus, concrete fact is process. Its primary analysis is into underlying activity of prehension, and into realised prehensive events. 
. . . The difficulties of philosophy in respect to space and time are founded on the error of considering them as primarily the loci of simple locations. Perception is simply the cognition of prehensive unification, or more shortly, perception is cognition of prehension. The actual world is a manifold of prehension; and a ‘prehension' is a ‘prehensive occasion'; and a prehensive occasion is the most concrete finite entity, conceived as what it is in itself and for itself, and not as from its aspect in the essence of another such occasion. . . . For space and time are simply abstractions from the totality of prehensive unifications as mutually patterned in each other. 
[In answer to Berkeley's claim that the reality of nature is] the reality of ideas in mind [Whitehead maintains that nature is] a complex of prehensive unifications. Space and time exhibit the general scheme of interlocked relations of these prehensions. You cannot tear any one of them out of its context. Yet each of them within its context has all the reality that attaches to the whole complex. Conversely, the totality has the same reality as each prehension; for each prehension unifies unifies the modalities to be ascribed, from its standpoint, to every part of the whole. A prehension is a process of unifying.
. . . The realities of nature are the prehensions in nature, that is to say, the events in nature. 

David Ray Griffin, in his Parapsychology, Philosophy, and Spirituality: A Postmodern Exploration helps to explain prehension by reference to more widely recognized extrasensory perception and religious experience: 

As to what kind of perception is primary and what is derivative from it: 

The fact that religious, moral, and aesthetic knowledge is based primarily on nonsensory perception should not make it seem less empirical (experientially based) than scientific knowledge, for two reasons. First, nonsensory perception is our fundamental mode of perception, so that science, insofar as it is based on sensory perception, is based on a derivative mode of perception. Second, science is also directly based on nonsensory perception, in two ways. On the one hand, insofar as science is based on both mathematics and logic, it is based on things whose status in the nature of things is similar to that of moral and aesthetic values and principles and must be known in the same way: through nonsensory perception--which we often call "intuition." . . . On the other hand, although natural science's explicit data (aside from its mathematical data) are based on sensory perceptions, the categories it uses to interpret them--such as an actual world, causality, and time--are based on nonsensory perception, as pointed out in Chapter 3. Accordingly, in terms of nonsensory and sensory perception, the differences between theology (or philosophy of religion), ethics, and aesthetics, on the one hand, and the natural sciences, on the other, is only a difference of degree. . . . 
In any case, parapsychology, by giving evidence of nonsensory perception, sometimes quite dramatic evidence, provides scientific disconfirmation of the sensationist theory of perception, which has been one of the two major bases for assuming that we can have no perceptual knowledge of values (the other basis being the assumption that values have no objective existence in the nature of things). Parapsychology thereby proves itself to be not only, as J. B. Rhine suggested, religion's science, but ethics' science and aesthetics' science as well. pp. 284-85 

On how evidence of telepathy contributes to theology: 

[It provides an analogy to our having] a direct experience of the mind or soul of the universe. [since any telepathy is experience of one mind by another]. In our experience of God . . . there would be no "distance" involved, assuming as do both traditional theism and panentheism, the all-pervasiveness of God. p. 286. 

About the relationship between parapsychological and other experiences: 

Parapsychology . . . provides an analogy for suspecting that they represent merely an extreme form of experience that is being enjoyed all the time. What is usually called "extrasensory perception," accordingly, is probably unusual only in that occasionally this constant direct nonsensory prehension of other minds or things rises to the conscious portion of one's experience. By analogy, we would be having direct experiences of the Holy Reality all the time. Those very rare experiences in which we have a religious experience in the strong sense, a numinous experience, would be unusual only in rising, in those rare moments, to consciousness. The constant but generally unconscious experience of God could account, then, for our presupposition, even if we consciously affirm otherwise, that there is something of ultimate intrinsic worth. This idea, incidentally, would fit with James's thesis that the kinds of experiences reported in The Varieties of Religious Experience are simply extreme versions of experiences common to everyone.
This experience of the divine experience, analogous to telepathic experience of other finite minds, may also be important for moral experience beyond the way mentioned abave. There I spoke of our prehension of God's appetitive envisagement of values, what Whitehead called God's "primordial nature." Abraham Heschel has suggested that the Hebrew prophets spoke out of an experience of the divine "pathos," God's suffering with the poor and opressed. This idea corresponds with Whitehead's suggestion that we can also have a prehension of God's "consequent nature," which is God's sympathetic response to the world: God's delight in the joys of the creatures and compassion with their sufferings. Parapsychologists can allow us to take Heschel's suggestion more seriously than we otherwise might. . . . pp. 286-87. 


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