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PSYB51H3 (313)
Lecture 6


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University of Toronto Scarborough
Matthias Niemeier

PERCEPTION LECTURE 6 eye movements- 6 muscles are attached to each eye and are arranged in three pairs InferiorSuperiorLateralMedial Rectus InferiorSuperior oblique Controlled by 3 cranial nerves Need to tell a person about up down.leftright back and forth 3 numbers are necessary for location Need numbers to describe orientation of object in space 3 numbers Controlled by extensive network of structures in the brain Superior Colliculus : structure in the midbrain that plays and important role in initating and guiding eye movements 2 muscles to rotate an object , 6 muscles in total Occulomotor nucleus gives rise to occulomotor nerve rect sup , medial rect, inf rect, inferior oblique Troclear innervates opposite side superior obliques Abducens innervates lateral rectus When stimulated with elec signals, eye movements are observed Layers involved in motor control, and visual Eye movements: Smooth Pursuit; eyes move smoothly to follow a moving object Saccade: Rapid movement of eyes that change fixation from one object or location to another Vergence Eye Movements: Type of eye movement in which two eyes move in opposite directions done deliberately Fixation eye movements, microsaccades Sometimes not possible to keep eyes fixated Eyes make counterrotations and need to correct for the rotation of the head Function of smooth pursuit eye movements,keep object of interest stable and on the fovea
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