PSYC 280 Study Guide - Two-Streams Hypothesis, Amblyopia, Opsin

• School: Simon Fraser University
• Department: Psychology
• Course: PSYC 280
• Professor: John Reynolds

Document Summary

Ach transmission in parasympathetic synapse relaxes muscle fiber and allows pupil to dilate (cid:215) morphine constricts pupil. Retina: visual-info process starts here using receptor cells- photoreceptors (detect light) rods and cones; release transmitters that control activity of bipolar cells that synapse with them connect with ganglion cells their axons form optic nerve carries info to brain) Horizontal cells: retinal cells that contact receptor and bipolar cells, , important in interactions within retina. Amacrine cells: retinal cells that contact bipolar and ganglion cells, important in interactions within retina. Rods, cones, bipolar cells, and horizontal cells generate only graded local potentials no action potentials; just respond to release of neurotransmitters in response to graded changes in electrical potentials (ganglion cells=action potential first electrical activity recorded in retina) Scotopic system: rods used, work in dim light/grey, lots of convergence sending info to each ganglion cell. Photopic system: cones used, work with more light/colour , less convergence sensing info from 1 cone.