Perceptual consciousness

Perceptual consciousness, or the perceptual attitude, is the mode in which an object is encountered as present in a shared spatiotemporal world. Sartre treats it as one of two irreducible attitudes of consciousness, distinct from imagining: perception organizes a present object through bodily engagement and implicit expectations, while an image aims at what is absent or nonexistent. Their difference is not a difference of vividness. It is a difference in how consciousness relates to its object, and the two attitudes cannot operate together toward the same scene.

Definition and Orientation

Perception gives a thing as occupying a determinate position in time and space, with qualities that belong to it as this particular thing. An imaged object, by contrast, need not be fixed to one indivisible moment or possess a single, fully determined appearance. Sartre calls the perceptual object’s definite individuation a central difference between what is perceived and what is imaged: a perceived thing cannot, in the same relation, be itself and something else, whereas an image may carry unresolved or competing qualities.

Perceptual consciousness is not simply the reception of isolated sensations. The object appears within a world, and what is presently visible is accompanied by unformulated intentions concerning aspects that are not. The visible upper face of an ashtray, for example, is perceived as belonging to an object with an underside resting on a table; the underside is not separately pictured, yet the perception incorporates this implicit understanding. Such intentions enrich the object without turning its unseen aspects into separate images. They remain bound to the perceived thing as part of the way it is encountered.

Bodily Movement and the Organization of Form

Perception is actively organized through the movement of the eyes and body. A schematic drawing of a face can first appear as unrelated marks: three segments meeting at a point, another point below and to one side, and a separate sinuous line. Eye movements organize these marks into spatial relations and figures. Under a changed intention, the same lines can instead be read as a forehead, eyebrow, nose, eye, mouth, and chin. The shift is not explained by the marks changing. The perceptual intention gives way to an imaged one, while the body adopts a way of looking that helps animate the lines as a face.

The white paper itself changes role in this reorganization. On one side of the lines, the space is taken as filled volume; on the other, it recedes into ground rather than being attended to as paper in its own right. The lines become contours through movements of the eyes, and the viewer can even supply a line that is not drawn by carrying the gaze between separated marks. The figure therefore depends on an organized relation among visible marks, eye movements, and the spatial field around them. What appears as a coherent face is not just a set of marks with a fixed meaning already contained in them.

Some perceptual forms guide movement more directly. In the Müller-Lyer illusion, closed angles interrupt the eye’s movement, while open angles allow it to continue. The opposed movements are attributed to the line segments, which consequently appear to differ in their power of extension. The result remains a perceptual object: movement has become a perceived quality or force of the lines, not an image of something absent. Sartre distinguishes this from a schematic image, where movements are projected onto lines as hypothetical directions and may help an imaged figure emerge. In that case, the viewer remains aware that the image is being created through spontaneous activity. Gestalt research, including the work of Wolfgang Köhler, Wertheimer, and Koffka, offers a way to study how formal structures persist through changes in position and help explain why perception can give more than is immediately visible.

Perception and Imaging as Alternating Attitudes

For Sartre, perception and imaging cannot be treated as elementary ingredients that combine to make experience. When a viewer attends to a painting as a material object, the canvas and its marks are perceived. When the viewer aims at Pierre as represented by that painting, the painting ceases to be the object of perceptual attention in the same way. Similarly, while a table is being perceived, an imaged Pierre cannot simply be added to the scene as another perceived item. If the imaged figure comes forward, the table recedes from the field of consciousness. The real table and the irreal Pierre are correlates of distinct, alternating attitudes.

This distinction also clarifies why a mental image is not a faint perception located somewhere in the room. A mental image may be described as aiming at a real thing through a psychic content that functions as its analogical representative, but the image itself is not seen in the way a chair or table is seen. Perception localizes its object in space; mental images are not situated beside surrounding objects. To say that someone sees an image does not mean that the image occupies a place in the shared perceptual field. The image’s representative content may represent sensible qualities without possessing those qualities as an external object would.

The distinction also helps explain the aesthetic object in a picture. The painted canvas and its material marks are perceptible, but the depicted Charles VIII is not identical with the canvas or its paint. The aesthetic object appears when consciousness turns from realizing the material support to an imaging attitude. The viewer cannot, in the same act, apprehend the canvas simply as a real object and the depicted figure as the aesthetic object. What is physically present supplies the means through which the irreality is apprehended; it does not make that irreality another perceived thing.

Determinacy, Ambiguity, and the Limits of Perception

Because perception presents a thing as determinate, it differs from the looseness Sartre finds in some imaged objects. An image can preserve incompatible qualities in an unresolved form: knowledge may be undecided, while affectivity makes one aspect more prominent and leaves another faintly present. Perception, in contrast, presents a thing as this thing, with a position and qualities that are fixed more strictly. This contrast does not mean that perception is exhausted by what the eyes currently register. The implicit intentions attached to an object allow perception to include absent aspects without turning them into independent images.

The difference becomes important in discussions of hallucination. Sartre rejects the simple explanation that a hallucinating person takes an inner image and projects it into the external world. The imaged object already has its own irreal space; the more fundamental question is how a person can believe in the reality of something that is given as irreal. He argues that hallucination involves an alteration of belief and, in more severe cases, a sudden collapse of perceived reality. Reports that place an apparition in a familiar room may be made after the hallucinatory episode, when the surrounding world has returned, rather than demonstrating that image-space and perceptual space were fused during the experience.

Sartre also describes a more thorough disintegration of personal synthesis in genuine hallucinations. Consciousness does not cease to exist, but the organized, concentrated activity through which a person sustains a unified perspective can falter. Perception becomes dim or foggy, while partial and difficult-to-grasp systems of voices or apparitions appear. This account preserves a distinction between perceiving and imagining even in pathological experience: the issue is not merely that an image becomes unusually vivid, but that the relation among spontaneous image-consciousness, belief, and the coherent apprehension of the real world changes.

Philosophical Significance

Perceptual consciousness is essential to Sartre’s broader argument because it prevents imagination from being reduced to a weaker form of seeing. Perception presents a thing in the world and implicitly opens onto aspects not currently visible; imaging aims at an absent or irreal object through a different act. Their alternation explains why images cannot be inserted into perception as extra sensory material, while their contrast makes it possible to describe how the same marks can first organize as perceived lines and then serve as the analogical support for an imagined figure. Perception is thus neither passive registration nor an incomplete image: it is a distinct, embodied way of being present to the world.