lecture3-08 - Neural Circuitry underlying generation of...

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Neural Circuitry underlying generation of saccades and pursuit Lab # 1 - Catching a ball - What to expect/ think about
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QuickTimeª and a MPEG-4 Video decompressor are needed to see this picture. What can be learnt from natural tasks?
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1. Fixations exclusively on task-relevant objects (see Land chapter) Eyes deal with one object at a time, corresponding to the duration of the manipulation.(Land: object-related actions) 3. Tight linkage between location of gaze and information needed at that moment. (Just-in-time strategy)
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Cortical specialization
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Brain Circuitry for Saccades Oculomotor nuclei V1: striate cortex Basal ganglia 1. Neural activity related to saccade 2. Microstimulation generates saccade 3. Lesions impair saccade
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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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Superior colliculus
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Frontal eye fields Voluntary control of saccades. Selection from multiple targets Relates to behavioral goals.
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-Saccades/Smooth Pursuit -Planning/ Error Checking -relates to behavioral goals Supplementary eye fields
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LIP: Lateral Intra-parietal Area Target selection for saccades: cells fire before saccade to attended object Posterior Parietal Cortex reaching grasping Intra-Parietal Sulcus: area of multi-sensory convergence
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Smooth pursuit Brain Circuitry for Pursuit
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Smooth pursuit Brain Circuitry for Pursuit Velocity signal Early motion analysis
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What information the the brain need?
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lecture3-08 - Neural Circuitry underlying generation of...

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