I’ve previously referred several times to Beatrice Longuenesse’s superb Kant and the Capacity to Judge (French ed. 1993; English ed. 1998). Here I’d like to offer a few quotations from the summary in her conclusion.
“The transcendental unity of apperception was first introduced in the [deduction of the categories in the first edition of the Critique of Pure Reason, referred to by scholars as the] A Deduction, in the exposition of the ‘synthesis of recognition in the concept’. There Kant argued that we could not recognize singular representations under common concepts unless they were taken up in one and the same act of combination and comparison, and unless we were (however dimly) conscious of the numerical identity of this act of combining our representations. This consciousness is what confers ‘logical form’ upon our representations. And it ‘presupposes’ or ‘includes’ a synthesis of imagination. In the [second edition] B Deduction, Kant specified that the ‘logical form’ thus given to our representations is that of judgment. The synthesis of imagination it presupposes is figurative synthesis (synthesis speciosa) or ‘affection of inner sense’ by the understanding. I argued that this meant affection of inner sense not by categorial understanding (i.e., understanding already equipped with categories as full-fledged concepts), but by understanding as the mere capacity to form judgments, Vermögen zu urteilen. Thus, the ‘I think’, or ‘transcendental unity of self-consciousness’, has no other meaning or status than that of being the unified activity of combination and reflection on the sensible given. There is no unity of self-consciousness or ‘transcendental unity of apperception’ apart from this effort, or conatus toward judgment, ceaselessly affirmed and ceaselessly threatened with dissolution in the ‘welter of appearances'” (p. 394).
“Kant’s view is rather that unity of consciousness is always both ‘my own’ and, insofar as it is ‘transcendental unity of self-consciousness’ whose form is that of judgment, so constituted that it is capable of transcending the point of view of ‘myself, in the present state of my perception’ to the point of view of ‘everybody, always’.”
“Kant further maintains that the conscious effort toward judgment, that is, transcendental unity of self-consciousness, is what makes possible consciousness of an objective temporal order. We have such consciousness only insofar as our perceptions are related to realities, to permanent or changing properties of singular things reciprocally determining each other’s location in space and time” (p. 395).
“The capacity to represent discursively (thought) and the capacity to locate things, ourselves included, in time are thus one and the same. The ‘unity of self-consciousness’ as the unity of the discursive conatus, and the unity of self-consciousness as the consciousness of an individuality located in time, are one and the same” (p. 396).
“For behind the deceptively rigid parallelism between logical forms of judgment and categories, what emerges is the cognitive effort of discursive beings confronting what is given to them in sensibility. This effort, conatus of the Vermögen zu urteilen, is according to Kant what essentially defines the kind of beings we are. It is also what generates the universal forms in which we think our world” (ibid).
“Kant argues that things (singular objects thought under concepts) are substitutional instances for ‘x’ in the logical form of categorical judgments only if they are also substitutional instances for ‘x’ in hypothetical judgments (whereby we are able to recognize their alterations)…. The ‘simple’ judgments (categorical judgments) by means of which we cognize things under concepts reflecting their essence, are thus possible only under the condition that we also generate ‘composite’ or ‘complex’ judgments (hypothetical or disjunctive judgments), by means of which we cognize a thing under its accidental marks, in universal correlation with all other things cognized in space and time” (p. 397).
“For Kant’s table of logical functions of judgment turns out to be, according to it author, an exposition of the minimal norms of discursive thinking necessary for us to be able to recognize and reidentify objects under concepts. And the infamous ‘transcendental synthesis of imagination’ turns out to be the complex web of perceptual combinations by means of which we take up sensible data into what we, in present times, have come to term ‘the space of reasons’” (p. 398).