PSY397H1 Study Guide - Midterm Guide: Antheraea Pernyi, Hyalophora Cecropia, Circadian Rhythm
Document Summary
Aplysia californiana & bulla gouldiana diurnal, eye removal changes daily behavior frequency of compound action potentials (caps) in the optic nerve is rhythmic - low at night, and rises rapidly at dawn. Cap frequency remains rhythmic in constant dark (circadian) Cap rhythm can be reset by light pulses in the subjective night. Remove the eyes and bulla and aplysia are arrhythmic behaviorally in constant conditions. Recordings of electrical activity from the eye are made using suction electrodes attached to the cut end of the optic nerve in vitro. The isolated eyes will survive in an artificial seawater bath for up to 10 days. Compound action potentials are produced by basal retinal neurons. Illumination of only brns in bulla produces only caps on the optic nerve. Illumination of only the visual retina produces only small, asynchronous activity in the optic nerve. The asynchronous activity is the discharge of the visual retinal ganglion cells. circadian rhythms.
