Full Idea
Kant thought that consciousness in general depends for its possibility on self-consciousness (or, as he called it, 'apperception').
Gist of Idea
Kant thought that consciousness depends on self-consciousness ('apperception')
Source
report of Immanuel Kant (Critique of Pure Reason [1781]) by Tim Crane - Elements of Mind 3.21
Book Reference
Crane,Tim: 'Elements of Mind' [OUP 2001], p.71
A Reaction
What would Kant have made of Darwin? Consciousness looks very useful in small dim animals for registering survival information.