NIH VideoCast - Decision Related Activity and Top-down Attentional Modulations in Primate VI

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Decision Related Activity and Top-down Attentional Modulations in Primate VI

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Air date:	Monday, September 24, 2012, 12:00:00 PM Time displayed is Eastern Time, Washington DC Local
Views:	Total views: 341 (15 Live, 326 On-demand)
Category:	Neuroscience
Runtime:	01:06:40
Closed captioning:	Check box to display CC outside of the video Note: You can drag the captioning window around and resize it
Description:	Neuroscience Seminar Series Dr. Eyal Seidemann has pioneered the use of optical imaging in awake primates doing demanding psychophysical tasks, to probe the relationship between behavior and sensory signals in cortical maps. A fundamental feature of many sensory and motor areas is the use of orderly maps for the representation of sensory and motor signals. In these maps, the value of the parameter computed by individual neurons (e.g., the orientation of a line segment; the direction and amplitude of a planned eye movement) changes systematically across one or two dimensions of a neural structure. Incoming neural signals, therefore, are rapidly transformed into a ‘place code’ – where the spatial pattern of activity within the map conveys information about a sensory stimulus or a planned movement. Because sensory and motor neurons are typically coarsely tuned, that is, each neuron responds to a broad range of stimulus or movement parameters, any stimulus or motor response elicits neural activity that is distributed over a large population of neurons within the neural map. Using a novel combination of optical imaging and electrophysiological techniques in awake, behaving primates, Dr. Seidemann has directly visualized the functional organization and the spatial pattern of population activity in cortical maps in real-time, while subjects perform demanding, well controlled, perceptual, cognitive, or motor tasks. These observations are combined with computational models that attempt to explain how the measured neural activity could lead to the observed behavior. These models are further tested by measuring how perceptual judgments or motor plans change following selective manipulations of the neural response by microstimulation or pharmacological microinjections. This unique combination of approaches puts Dr. Seidemann’s work at the forefront of modern attempts to explain the link between activity in sensory neurons and behavior. For more information go to http://neuroseries.info.nih.gov

NLM Title:	Decision related activity and top-down attentional modulations in primate VI / Eyal Seidemann.
Author:	Seidemann, Eyal. National Institutes of Health (U.S.),
Publisher:
Abstract:	(CIT): Dr. Eyal Seidemann has pioneered the use of optical imaging in awake primates doing demanding psychophysical tasks, to probe the relationship between behavior and sensory signals in cortical maps. A fundamental feature of many sensory and motor areas is the use of orderly maps for the representation of sensory and motor signals. In these maps, the value of the parameter computed by individual neurons (e.g., the orientation of a line segment; the direction and amplitude of a planned eye movement) changes systematically across one or two dimensions of a neural structure. Incoming neural signals, therefore, are rapidly transformed into a "place code" - where the spatial pattern of activity within the map conveys information about a sensory stimulus or a planned movement. Because sensory and motor neurons are typically coarsely tuned, that is, each neuron responds to a broad range of stimulus or movement parameters, any stimulus or motor response elicits neural activity that is distributed over a large population of neurons within the neural map. Using a novel combination of optical imaging and electrophysiological techniques in awake, behaving primates, Dr. Seidemann has directly visualized the functional organization and the spatial pattern of population activity in cortical maps in real-time, while subjects perform demanding, well controlled, perceptual, cognitive, or motor tasks. These observations are combined with computational models that attempt to explain how the measured neural activity could lead to the observed behavior. These models are further tested by measuring how perceptual judgments or motor plans change following selective manipulations of the neural response by microstimulation or pharmacological microinjections. This unique combination of approaches puts Dr. Seidemann"s work at the forefront of modern attempts to explain the link between activity in sensory neurons and behavior.
Subjects:	Attention--physiology Brain Mapping--veterinary Decision Making--physiology Models, Animal Perception Primates
Publication Types:	Lecture Webcast

NLM Classification:	QY 60.P7
NLM ID:	101595167
CIT Live ID:	11769
Permanent link:	https://videocast.nih.gov/watch=11769

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