lecture8-08 - Describe 2 kinds of eye movements and their...

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Unformatted text preview: Describe 2 kinds of eye movements and their function. Types of Eye Movement Information Gathering Stabilizing Voluntary (attention) Reflexive Saccades vestibular ocular reflex (vor) new location, high velocity, ballistic body movements Smooth pursuit optokinetic nystagmus (okn) object moves, velocity, slow whole field image motion Vergence change point of fixation in depth slow, disjunctive (eyes rotate in opposite directions) (all others are conjunctive ) Fixation: period when eye is relatively stationary between saccades. Describe foveal over-representation in the visual cortex. Give a reason for this over-representation. Draw a diagram to illustrate your answer. Cortical Magnification Larger cortical area for neural projections from the fovea than periphery Primary Visual Cortex: V1 Draw a diagram to illustrate your answer. A reason for this over-representation: High density of cone photoreceptors in central fovea (also ganglion cells) What is the Perception-Action Cycle? Give an example. cat image neural activity reach, pick up cat moves afferent signals efferent signals recognize, locate cat compute movement Perception  Action Cycle 200 msec 500 msec Perceptions and action form a continuous loop: Sensory information leads to actions which the alter incoming sensory information. Describe the specialized gaze patterns found by Land in cricket. Eye movements in cricket: Batsman anticipate bounce point Better batsman arrive earlier Land & MacLeod, 2001 pur suit saccade 1) Batsman fixates the bowler’s hand 2) Makes a saccade to the anticipated location of the bounce. 3) This is followed by a smooth pursuit movement after the bounce. The bounce point gives information about where and when to swing the bat. Describe your results in the ball-catching lab. Did you find the same basic pattern as Land did? How did your results differ? Catching: Gaze Patterns Catcher Thrower saccade X X smooth pursuit X Draw a sketch of the brain showing the structures involved in the generation of a saccadic eye movement. Specify the function of these structures (to the extent that this is possible) (LI P) tar get selection...
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This note was uploaded on 08/12/2008 for the course PSY 341K taught by Professor Gilden during the Spring '08 term at University of Texas.

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lecture8-08 - Describe 2 kinds of eye movements and their...

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