PSYC 212 Lecture Notes - Lecture 4: Rhodopsin, Ellsworth Kelly, Small Cell

• School: McGill University
• Department: Psychology
• Course: PSYC 212
• Professor: Mathieu Roy

Document Summary

Receptive field = region on retina in which stimuli. Light to rgc: light hyperpolarize (-) center cone [more negative] *dark depolarize (cid:894)+(cid:895) center cones [more positive: signal transmitted to bipolar cells. *transmit same shape & sign: dark depolarize (cid:894)+(cid:895) surround cones [more positive, light on center (-) cone & dark on surround (+) cone = activate horizontal cells. Receive more inhibition (-) than surround cones *3 (-) signs: this amplify bipolar on-cell activity & rgc activity/firing rate. *2 types of bipolar cells & ganglion cells = on-center / off-center. Allows black-on-white to stand out as much as white-on-black *high contrast. *kuffler = mapped out receptive fields of individual retinal ganglion cells rgc in cat. [lot of vision research on cat because rodents = nocturnal species] Determine rgc"s receptive field = found center & surround property. Excited (+) by light on their center = ap. Inhibited (-) by light on their surround = ap.