PSYC 2P49 Lecture Notes - Lecture 7: Retina, Parahippocampal Gyrus, Illusory Contours

• School: Brock University
• Department: Psychology
• Course: PSYC 2P49
• Professor: Stephen Emrich

Document Summary

1) how do we determined that something is an object. Types of processing that contribute to object recognition. Feedforward/bottom-up: processing that starts at the receptor and proceeds one step aher the other, without in uence from higher levels. Feedback/top-down: processing at early stages is in uenced by processing at later/ higher stages. 1) stimulus (pattern)on the receptor (retina) is ambiguous. Inverse projection problem an in nite number of stimuli can combine to make the 2-d image that projects onto the re8na how to interpret the correct one . 2) pattern varies as a function of position/lighting. 3) relevant patterns must be distinguished from irrelevant ones. After low-level features have been extracted (lines ,orientations, colours, etc) Before recognition and scene understanding (high level) Midlevel vision exploits the fact that there are regularities in the world. Our visual systems expects the world to be consistent with these regularities. Cells in v1/striate cortex explicitly respond to edges.