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lecture10-08 - Describe 2 functions of eye movements and...

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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 2 functions of eye movements and give an example of each.  
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Describe foveal over-representation in the visual cortex.  Give a reason for this over-representation. Draw a diagram to  illustrate your answer.
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Cortical  Magnification Larger cortical area for neural projections  from the fovea than periphery Primary Visual Cortex: V1 Describe foveal over-representation in the visual cortex.  Give a reason for this over-representation. Draw a diagram to  illustrate your answer.
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Give a reason for this over-representation.       -    High density of cone photoreceptors in central fovea.
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Describe your results in the ball-catching lab.
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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)
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target selection signals to muscles inhibits SC saccade decision saccade command monitor/plan movements Function of Different Areas
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Sketch a muscle, including the muscle spindle and  the sensory and motor nerve fibers.  
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MUSCLEFIBRE/SPINAL Spindles Golgi Extrafusal Intrafusal Secondary Encoding (Less Sensitive) Dorsal Ventral
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Role of Visual Feedback Question: why does error increase with speed? Note: 50 cm/sec = 5cm/100msec How does the speed of a movement (e.g. reaching) affect  its accuracy? Explain why.
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Draw a sketch of a feedback system and a feedforward  system. Give an example of each (for visuo-motor control).  
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