PSYC 212 Chapter Notes - Chapter 9: Spatial Frequency, Grater, Resting Potential

• School: McGill University
• Department: Psychology
• Course: PSYC 212
• Professor: Remy Allard

Document Summary

If light spot falls on excitatory part of receptive field ganglion cell displays burst of action potentials over + above spontaneous discharge rate. Off bipolars do not show such an effect + are not depolarized in presence of light. Two separate types of ganglion cell one stimulated by light spot through intermediate on bipolar cell one stimulated by dark spot through intermediate off bipolar cell. Scotopic sensitivity profile is higher throughout the visible spectrum except at long wavelengths where photopic vision actually more sensitive: because the absorption spectrum of rod rhodopsin declines rapidly at long wavelengths. Finding extra intensity d i that is just needed to detect small light spot against background of a particular intensity (ib) When background intensity increases, expected that a greater change will be needed to detect the light spot. Small spot placed just outside fovea, tvi (threshold vs intensity) has two functions (one for rods, one for cones) that increases exponentially.