Body schema and awareness 35 how is attention

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Unformatted text preview: s 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 35 How is Attention Directed? !   Cortical, subcortical areas !  Modulate the activity of neurons in sensory cortex areas !   The Pulvinar Nucleus !  Guiding attention !  Muscimol !  GABA agonist !  Neuron activity suppressed 36 How is Attention Directed? !   Attention and Eye Movements !  Eye moves to attended object !  Eye movements & attention closely related !  Recent experiments !  Brain circuitry: Directing eyes to objects of interest !  Frontal Eye Fields (FEF) !  Cortical area !  FEF neurons 37 How is Attention Directed? !   Attention and Eye Movements (Cont’d) !  Experiment ! Train monkeys to look at   display of small light spots !  Place electrode in FEF and determine motor field of neurons at the tip !  Small electrical stimulation enhancement? !  Results !  FEF involved in directing attention; Enhancing visual performance !  V4 activity increased 38 How is Attention Directed? !   Attention and Eye Movements !  Results (Cont’d) !  FEF stimulation mimics physiological and behavioral effects of attention !  Electrical stimulation of superior colliculus !  Conclusion !  Guidance of attention !  Integrated with system to move eyes 39 Networks of attentional control How is Attention Directed? !   Grent-’t-Jong & Woldorff (2007): attentional cueing involves a parieto-frontal network. !   Using fMRI to identify sources of ERP signal: !   FEF precedes LIP activity 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 41 Corbetta's DAN and VAN !   Dorsal attentional network for goal-directed (endogenous) selection and responses. Associated with both hemispheres. !   Ventral attentional network for unexpected, salient stimuli, circuit breaker. Mainly associated with the right hemisphere. 42 Concluding Remarks !   Studies of attention !  Point to flexibility of the human brain !   More mental energy to one location !  Enhanced sensitivity & reaction time !  Ignoring competing stimuli !   Need...
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