PSYC 380 Lecture Notes - Lecture 2: Purkinje Cell, Vergence, Purkinje Fibers

• School: Queen's University
• Department: Psychology
• Course: PSYC 380
• Professor: Niko Troje

Document Summary

Any movement of a 3d object can be described in 3 degrees of motion. 6 extraocular muscles in each eye: superior/ inferior rectus, medial/ lateral rectus, superior/ inferior oblique. 3 cranial nerves are dedicated just to control extraocular muscles: Mobile eyes allow (1) preservation of spatial resolution and (2) binocular registration: refreshing visual responses, preventing adaptation to unchanging stimulation, when retinal image is perfectly stabilized, visual sensations disappear entirely. Smooth pursuit- when the eyes lock onto a moving target and track it as it moves across visual field. Fixations- maintaining of the visual gaze on a single location. Angular velocity- vestibular system (internal sensory) measures angular velocity for rotation. Purposes of eye movements: image stabilization, exploration, binocular fusion. Saccades rapid, reflexive, voluntary shifts in eye position between steady fixations lasting 45 ms: optokinetic nystagmus- a combination of a saccade and smooth pursuit eye movements.