Non-homogeneous spatial configuration of vibrissae cortical representation in layer IV of the barrel somatosensory cortex

In the present experiments we studied exclusive and overlapping cortical representational áreas of the vibrissae in layer IV cells, across the entire barrel subfield of the rat somatosensory cortex, looking for evidences that would challenge the present assumptions of homogeneity and symmetry among...

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Autores principales:	GUIC,ELIANA, CARRASCO,XIMENA, RODRÍGUEZ,EUGENIO, ROBLES,IGNACIO, MERZENICH,MICHAEL M
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2008
Materias:	cortical representation barrel cortex evoked activity rat -somatosensory cortex spatial configuration
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000400011
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spelling	oai:scielo:S0716-976020080004000112009-06-16Non-homogeneous spatial configuration of vibrissae cortical representation in layer IV of the barrel somatosensory cortexGUIC,ELIANACARRASCO,XIMENARODRÍGUEZ,EUGENIOROBLES,IGNACIOMERZENICH,MICHAEL M cortical representation barrel cortex evoked activity rat -somatosensory cortex spatial configuration In the present experiments we studied exclusive and overlapping cortical representational áreas of the vibrissae in layer IV cells, across the entire barrel subfield of the rat somatosensory cortex, looking for evidences that would challenge the present assumptions of homogeneity and symmetry among cortical columns in this sensorial system. Our main findings were that in layer IV of the rat barrel cortex: A) Size of vibrissae cortical representational áreas (X=0.4174mm²; SD=0.025) was not homo geneous, vibrissae in dorsal rows (A-B) had significantly smaller áreas than those in ventral rows (D-E), a pattern that repeated itself in ares 1-4. B) This difference arises from vibrissal representational overlap, and not from variations in exclusive zones, which are surprisingly homogeneous in size across the barrel cortex (X=0.079mm²; SD=0.0075); C) The extent of overlapping cortical áreas varied systematically, with intra-row overlapping áreas having a predominant bias (71.4% of total overlapping) independent of área sizes. Accordingly, vibrissae shared receptive fields with an average of 1.15 vibrissae in the same row and 0.38 in the same are. Barrel cortex has been viewed operationally as a conglomérate of essentially homogenous cortical columns that interact equivalently in the are and row dimensions. Our simple but global cortical reconstructions show that this predominant view should be revised. We postúlate that the vibrissae/barrels spatial disposition in rows and ares has a relevant functional meaning, related to different sensory capabilities.info:eu-repo/semantics/openAccessSociedad de Biología de ChileBiological Research v.41 n.4 20082008-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000400011en10.4067/S0716-97602008000400011
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	cortical representation barrel cortex evoked activity rat -somatosensory cortex spatial configuration
spellingShingle	cortical representation barrel cortex evoked activity rat -somatosensory cortex spatial configuration GUIC,ELIANA CARRASCO,XIMENA RODRÍGUEZ,EUGENIO ROBLES,IGNACIO MERZENICH,MICHAEL M Non-homogeneous spatial configuration of vibrissae cortical representation in layer IV of the barrel somatosensory cortex
description	In the present experiments we studied exclusive and overlapping cortical representational áreas of the vibrissae in layer IV cells, across the entire barrel subfield of the rat somatosensory cortex, looking for evidences that would challenge the present assumptions of homogeneity and symmetry among cortical columns in this sensorial system. Our main findings were that in layer IV of the rat barrel cortex: A) Size of vibrissae cortical representational áreas (X=0.4174mm²; SD=0.025) was not homo geneous, vibrissae in dorsal rows (A-B) had significantly smaller áreas than those in ventral rows (D-E), a pattern that repeated itself in ares 1-4. B) This difference arises from vibrissal representational overlap, and not from variations in exclusive zones, which are surprisingly homogeneous in size across the barrel cortex (X=0.079mm²; SD=0.0075); C) The extent of overlapping cortical áreas varied systematically, with intra-row overlapping áreas having a predominant bias (71.4% of total overlapping) independent of área sizes. Accordingly, vibrissae shared receptive fields with an average of 1.15 vibrissae in the same row and 0.38 in the same are. Barrel cortex has been viewed operationally as a conglomérate of essentially homogenous cortical columns that interact equivalently in the are and row dimensions. Our simple but global cortical reconstructions show that this predominant view should be revised. We postúlate that the vibrissae/barrels spatial disposition in rows and ares has a relevant functional meaning, related to different sensory capabilities.
author	GUIC,ELIANA CARRASCO,XIMENA RODRÍGUEZ,EUGENIO ROBLES,IGNACIO MERZENICH,MICHAEL M
author_facet	GUIC,ELIANA CARRASCO,XIMENA RODRÍGUEZ,EUGENIO ROBLES,IGNACIO MERZENICH,MICHAEL M
author_sort	GUIC,ELIANA
title	Non-homogeneous spatial configuration of vibrissae cortical representation in layer IV of the barrel somatosensory cortex
title_short	Non-homogeneous spatial configuration of vibrissae cortical representation in layer IV of the barrel somatosensory cortex
title_full	Non-homogeneous spatial configuration of vibrissae cortical representation in layer IV of the barrel somatosensory cortex
title_fullStr	Non-homogeneous spatial configuration of vibrissae cortical representation in layer IV of the barrel somatosensory cortex
title_full_unstemmed	Non-homogeneous spatial configuration of vibrissae cortical representation in layer IV of the barrel somatosensory cortex
title_sort	non-homogeneous spatial configuration of vibrissae cortical representation in layer iv of the barrel somatosensory cortex
publisher	Sociedad de Biología de Chile
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000400011
work_keys_str_mv	AT guiceliana nonhomogeneousspatialconfigurationofvibrissaecorticalrepresentationinlayerivofthebarrelsomatosensorycortex AT carrascoximena nonhomogeneousspatialconfigurationofvibrissaecorticalrepresentationinlayerivofthebarrelsomatosensorycortex AT rodriguezeugenio nonhomogeneousspatialconfigurationofvibrissaecorticalrepresentationinlayerivofthebarrelsomatosensorycortex AT roblesignacio nonhomogeneousspatialconfigurationofvibrissaecorticalrepresentationinlayerivofthebarrelsomatosensorycortex AT merzenichmichaelm nonhomogeneousspatialconfigurationofvibrissaecorticalrepresentationinlayerivofthebarrelsomatosensorycortex
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Non-homogeneous spatial configuration of vibrissae cortical representation in layer IV of the barrel somatosensory cortex

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