General principles of cognition?

This talk explores how far it is possible to find general principles that apply across a wide range of cognitive processes (e.g., from language learning, to perception, to memory). What such principles might there be? And how might they constrain our theories of specific cognitive domains? I will describe about some candidate principles, including simplicity and scale-invariance. General principles in cognitive science tend to have exceptions. Are these fatal? Or can exceptions signal particularly interesting cognitive phenomena?