Eye movements as a metaphor for attention eye motor

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Unformatted text preview: cade saccade target location attended saccade 25 Attention and eye movements !   Eye movements as a metaphor for attention: !   Eye motor control vs. Fovea !   Control of attention vs. (perceptual/ physiological) effects of attention 26 Overview ! ! ! ! ! ! ! ! Behavioral consequences of attention Selective attention and orienting Attention and eye movements Physiological effects of attention How is attention directed? Corbetta's DAN and VAN What is neglect? Body schema and awareness 27 Physiological Effects of Attention !   Shifting attention !  What happens to neural activity? !  What brain areas are involved? !  Observed in high-level cognitive and numerous sensory areas !  e.g., Area V1 to visual cortical areas in the parietal and temporal lobes 28 Physiological Effects Of Attention !   Functional MRI Imaging of Attention to Location !  Subjects view stimulus !  Change location of attended sector !  Brain activity shifts retinotopically 29 Physiological Effects of Attention !   PET Imaging of Attention to Features !  Same-different discrimination task !  Features: Color, shape, speed !  (A) Selective attention: one feature !  (B) Divided attention: all features !  Subtract B from A shows brain activity associated with attention to one feature 30 Physiological Effects of Attention !   PET Imaging of Attention to Features (Cont’d) !  V4, IT and other visual areas in temporal lobe Color & shape !  Area MT Speed of motion 31 Physiological Effects Of Attention !   Enhanced Neuronal Responses in Parietal Cortex !  Attention: Experimental vs. Normal conditions !  What happens to attention under normal conditions? !  Assumption: Attention changes location prior to eye movement !  Wurtz, Goldberg, and Robinson !  Record neural activity from several brain regions 32 Physiological Effects Of Attention !   Enhanced Neuronal Responses in Parietal Cortex (Cont’d) !  Posterior parietal cortex neurons !  Directing eye movements !  Response significantly enhanced neuronal response when eyes went to target !  Spatially selective effect – not a general increase in excitablility 33 Physiological Effects Of Attention !   Receptive Field Changes in Area V4 34 Overview ! ! ! ! ! ! ! ! Behavioral consequence...
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This note was uploaded on 04/11/2012 for the course NEURO NROC64 taught by Professor Matthias during the Winter '12 term at University of Toronto.

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