Visual spatial summation in macaque geniculocortical afferents.

Visual spatial summation in macaque geniculocortical afferents. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Visual spatial summation in macaque geniculocortical afferents. Abstract Text:

Michael P Sceniak,Soumya Chatterjee,Edward M Callaway,

The spatial summation properties of visual signals were analyzed for geniculocortical afferents in the primary visual cortex (V1) of anesthetized paralyzed macaque monkeys. Afferent input responses were recorded extracellularly during cortical inactivation through superfusion of the cortex with muscimol, allowing investigation of lateral geniculate nucleus of the thalamus (LGN) cell properties in the absence of cortical feedback. Responses from afferent inputs were classified as magno-, parvo-, or koniocellular based on anatomical organization within the cortex, established through histological reconstructions, and visual response wavelength sensitivity. More than 80% of afferents showed strong surround suppression [suppression index (SI) >0.5] and 14% showed negligible surround suppression (SI < 0.2). Afferent responses with weak and strong surround suppression were found throughout cortical input layers 4C and 4A. High-contrast estimates of the spatial extent of the classical surround were similar to the nonclassical surround. The classical and nonclassical surrounds were, on average, 1.5-fold larger than the excitatory center. Unlike neurons within V1, the spatial extent of excitatory summation for geniculocortical afferents was contrast invariant. Nonclassical surround suppression showed slight contrast dependency with estimates larger (20%) at lower contrasts and stronger at higher contrasts (13%). Surround suppression is inherent in cortical input responses and likely derives from lateral inhibition in either the LGN or retina. Although surround suppression within afferent responses increases slightly with contrast, the spatial spread of excitation remains fixed with contrast. This argues for distinct mechanisms of action for contrast-dependent modulation in cortical and subcortical responses.

Visual spatial summation in macaque geniculocortical afferents. Publishing Authors By Initials

MP Sceniak,S Chatterjee,EM Callaway,

For similar psychological phenomena and processes: mental processes: perception: visual perception research abstracts see: psychological phenomena and processes: mental processes: perception: visual perception research

PUBMED ID PMID:

MEDLINE DATE:

Visual spatial summation in macaque geniculocortical afferents. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of neurophysiology

VOLUME: 96

Page Numbers: 3474-84

Journal Abbreviation: J. Neurophysiol.

ISSN: 0022-3077

DAY: 23

MONTH: 08

YEAR: 2006

Visual spatial summation in macaque geniculocortical afferents. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 375404

Visual spatial summation in macaque geniculocortical afferents. Keywords Mesh Terms:

KEYWORDS: Visual Perception

MESH TERMS: physiology

Chemical & Substance for Abstract: Visual spatial summation in macaque geniculocortical afferents. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Visual spatial summation in macaque geniculocortical afferents.

AFFILIATION: Department of Anesthesia, Stanford University Medical Center, Room S288, Stanford, CA 94305-5117, USA. sceniak@stanford.edu

Country: United States

AGENCY: United States NEI

GRANT: EY 01742

ACRONYM: EY

MEDLINETA: J Neurophysiol

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Visual spatial summation in macaque geniculocortical afferents Related Publications

• ACTH and cortisone; their role in dermatologic therapy.
• Angioendothelioma: report of an unusual case in an American black.
• Association of delay to first intervention with return of spontaneous circulation in a swine model of cardiac arrest.
• Bioterror: the green menace.
• Cancer of the breast.
• Candida granuloma. A clinical and immunologic study.
• Cell biology. Bacteria's new bones.
• Cervical plexus anesthesia to control diaphragmatic excursion during extracorporeal shock wave lithotripsy.
• Comparison of the effects of hypothermia at 33 degrees C or 35 degrees C after cardiac arrest in rats.
• Contributions by dermatology to the progress of medicine.
• Course of changes in salivary pH-values after intake of different beverages in young children.
• Dermatology.
• Dietary guidelines for Americans: an historical perspective.
• Energy: to catch a wave.
• Global efforts to improve palliative care: the International End-of-Life Nursing Education Consortium Training Programme.
• Increased chest compression to ventilation ratio improves delivery of CPR.
• Inter-rater reliability for witnessed collapse and presence of bystander CPR.
• Management of common dermatoses.
• Monosynaptic restriction of transsynaptic tracing from single, genetically targeted neurons.
• More than a feeling: sensation from cortical stimulation.
• Multiple circuits relaying primate parallel visual pathways to the middle temporal area.
• Personal response to the sixth conference of the Association of Professors of Dermatology. Changing currents in undergraduate and postgraduate medicine--their impact on dermatology.
• Plant-disease controls sap outbreak responses.
• Predictors of ROSC in witnessed aeromedical cardiac arrests.
• Recent advances in dermatology.
• Rescue shock outcomes during out-of-hospital cardiac arrest.
• Successful treatment of hyperhidrosis using banthine.
• The second conference on undergraduate teaching in dermatology of the Association of Professors of Dermatology, Chicago, April 30--May 2, 1965. Concluding remarks.
• Visual spatial summation in macaque geniculocortical afferents.
• Why does the sensitivity of computed tomographic scan for detecting subarachnoid blood never improve?