Dynamic circuitry for updating spatial representations. III. From neurons to behavior.

Dynamic circuitry for updating spatial representations. III. From neurons to behavior. Research Abstract Details 

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Dynamic circuitry for updating spatial representations. III. From neurons to behavior. Abstract Text:

Rebecca A Berman,Laura M Heiser,Catherine A Dunn,Richard C Saunders,Carol L Colby,

Each time the eyes move, the visual system must adjust internal representations to account for the accompanying shift in the retinal image. In the lateral intraparietal cortex (LIP), neurons update the spatial representations of salient stimuli when the eyes move. In previous experiments, we found that split-brain monkeys were impaired on double-step saccade sequences that required updating across visual hemifields, as compared to within hemifield. Here we describe a subsequent experiment to characterize the relationship between behavioral performance and neural activity in LIP in the split-brain monkey. We recorded from single LIP neurons while split-brain and intact monkeys performed two conditions of the double-step saccade task: one required across-hemifield updating and the other required within-hemifield updating. We found that, despite extensive experience with the task, the split-brain monkeys were significantly more accurate for within-hemifield than for across-hemifield sequences. In parallel, we found that population activity in LIP of the split-brain monkeys was significantly stronger for the within-hemifield than for the across-hemifield condition of the double-step task. In contrast, in the normal monkey, both the average behavioral performance and population activity showed no bias toward the within-hemifield condition. Finally, we found that the difference between within-hemifield and across-hemifield performance in the split-brain monkeys was reflected at the level of single-neuron activity in LIP. These findings indicate that remapping activity in area LIP is present in the split-brain monkey for the double-step task and covaries with spatial behavior on within-hemifield compared to across-hemifield sequences.

Dynamic circuitry for updating spatial representations. III. From neurons to behavior. Publishing Authors By Initials

RA Berman,LM Heiser,CA Dunn,RC Saunders,CL Colby,

For similar nervous system: neural pathways: afferent pathways: visual pathways research abstracts see: nervous system: neural pathways: afferent pathways: visual pathways research

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Dynamic circuitry for updating spatial representations. III. From neurons to behavior. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Journal of neurophysiology

VOLUME: 98

Page Numbers: 105-21

Journal Abbreviation: J. Neurophysiol.

ISSN: 0022-3077

DAY: 9

MONTH: 05

YEAR: 2007

Dynamic circuitry for updating spatial representations. III. From neurons to behavior. Information

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LANGUAGE: eng

NlmUniqueID: 375404

Dynamic circuitry for updating spatial representations. III. From neurons to behavior. Keywords Mesh Terms:

KEYWORDS: Visual Pathways

MESH TERMS: physiology

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Grant and Affiliation Information for Dynamic circuitry for updating spatial representations. III. From neurons to behavior.

AFFILIATION: Department of Neuroscience and Center for the Neural Basis of Cognition, University of Pittsbirgh, Pittsburgh, PA, USA.

Country: United States

AGENCY: United States NCRR

GRANT: P41 RR03631

ACRONYM: RR

MEDLINETA: J Neurophysiol

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