Sartre’s critique of sensation

Sartre’s critique of sensation dismantles the idea that perception begins with inert impressions sealed inside the mind and only later reaches the world. Sensation is not an experienced inner object that mediates between a perceiver and things: it is a theoretical fiction generated by a circular account of consciousness. In its place, Sartre insists that consciousness is already directed toward objects and that the senses disclose worldly qualities rather than private impressions.

The Sensation Model and Its Contradictions

The classical account begins by treating the sense organ as an object affected from outside. To connect that objective stimulation with a supposedly subjective experience, it then imagines sensation as a tiny, inert unity produced by the stimulus and organ. Because such an entity cannot supposedly exist without support, the theory posits a passive inner environment—a mind or consciousness conceived as an object—in which sensations occur. It describes the mind as living sensations that remain distinct from it, a magical inherence that makes sensation both inside the mind and exterior to it.

That construction reverses the ordinary meaning of subjectivity. Here, subjective does not mean a self that spontaneously directs itself toward the world; it means something closed within itself, unable to transcend its own boundaries. Sensation is accordingly pictured as pure receptivity: an impression suffered in psychic space, neither presenting nor representing an object. Yet the theory also needs that sealed-off impression to explain the mind’s contact with objects. The very relation to the world that sensation is introduced to explain has been removed from consciousness at the level where sensation supposedly occurs.

The Circularity of the Explanation

Sartre exposes the model’s circular reasoning through its account of the sense organ. The theorist first relies on perception of the Other’s body, its sense organs, and instruments of induction to establish an objective stimulus. The theory then withdraws into sensation as purely lived subjectivity, which can supposedly inform the subject only about itself. Finally, it makes sensations the basis for reconstructing the external world, including the sense organs and instruments that were used to explain them in the first place.

The sense organ thus changes status inside a single argument: it begins as objective reality and becomes a subjective construction founded on sensations. But those sensations, in turn, are supposed to derive from the organ. Sartre compares the resulting reversal to the Cynic liar paradox: the premise that the account treats as true is also what makes it contradictory. No grouping of impressions can confer objective status on something defined from the outset as purely subjective. The proposed foundation cannot explain a genuine contact with things because it has already divided subjectivity from the world it is meant to recover.

Intentional Consciousness Against Inner Contents

The alternative begins by rejecting the premise that consciousness contains neutral mental items. In Sartre’s account, consciousness is positional: it transcends itself toward an object and is absorbed in that act of positing. A table is not lodged in consciousness as a representation; it is in space, beside a window. Its opacity—the fact that an exhaustive inventory of it would require an infinite process—belongs to the object, not to an inner mental container.

This outward directedness does not mean that every consciousness is knowledge. Affective consciousness, for example, need not be knowing consciousness. But where consciousness knows, it is consciousness of its object and of itself as knowing that object. Consciousness of knowing the table is not a second inner image added to an initial impression; it is the self-awareness that accompanies the act directed toward the table. This account preserves the distinction between consciousness and the object without placing a sensory intermediary inside consciousness.

Perception, Passivity, and the Reality of the Object

The critique also fits Sartre’s wider rejection of hidden interiors behind appearances. An existent is not a surface concealing a secret nature; it is disclosed through a series of appearances that refer to one another. Force, for example, is the totality of its effects, not an unknowable entity hiding behind them. Similarly, an electric current is disclosed through the physical and chemical actions that manifest it, such as electrolysis, a carbon filament’s incandescence, or a galvanometer needle’s displacement. No one manifestation exhausts the series, but none points to a concealed reverse side.

The perceived object likewise cannot be reduced to the perceiver’s synthesis of impressions. The table is the transcendent limit and end of that synthesis, not the synthesis itself. Sartre further argues that passivity cannot supply the object’s being: to undergo a modification is to be affected by another, but the one who suffers must already exist in order to support that modification. Even accepting an offense and continuing to be the one offended involves assuming one’s existence; passivity cannot make being arise from nothing. Applied to perception, this means that the object cannot receive its being from the perceiving act as though it were a passive product sustained by consciousness.

The Senses as Access to the World

Rejecting sensation as an inner impression does not require rejecting the senses. Sartre notes that people encounter the green of a notebook or foliage, not a private sensation of green, and that they touch cold, polished marble rather than first encountering a sealed impression from which marble must be inferred. The senses remain real in the ordinary and consequential sense that an accident can deprive someone of sight or hearing. The question is not whether seeing and touching occur, but whether they must be explained as contents trapped inside the mind.

Sartre’s answer is that they do not. Perception is a relation to objects from the outset, not a reconstruction assembled out of impressions whose status shifts between objective cause and subjective content. The senses disclose the world’s qualities; sensation, conceived as a hybrid object between subject and object, adds no explanatory power. By refusing that intermediary, the critique preserves consciousness as intentional and the perceived thing as irreducible to knowledge of it.