Bottom-Up and Top-Down Processing

Sensory receptors register external environmental information and send it to the brain for interpretation.
It involves taking in information and trying to make sense of it, starting with the external world.
Example: Listening carefully to an unfamiliar song to get a "feel" for it.

Starts with cognitive processing in the brain.
Involves beginning with an existing framework or expectations and applying it to incoming information.
Can be observed when expectations influence what is perceived (seen, heard, felt).
Example: Listening to a familiar song with expectations of what comes next, or singing along.