Temporal patterns of field potentials in vibrissa/barrel cortex reveal stimulus orientation and shape.
J Neurophysiol
; 95(4): 2242-51, 2006 Apr.
Article
em En
| MEDLINE
| ID: mdl-16394071
ABSTRACT
During environmental exploration, rats rhythmically whisk their vibrissae along the rostrocaudal axis. Each forward extension of the vibrissa array establishes rapid spatiotemporal contact with an object under investigation. This contact presumably produces equally rapid spatiotemporal patterns of population responses in the vibrissa representation of somatosensory cortex [the posterior medial barrel subfield (PMBSF)] reflecting features of a stimulus. We used extracellular mapping to identify object features based on spatiotemporal patterns of evoked potentials. Spatiotemporal modeling of evoked potential patterns accurately reconstructed linear versus curved stimuli and detected orientation changes as small as 5 degrees. Whiskers forming arcs in the PMBSF, essential for this reconstruction, may represent a fundamental processing module. We propose that the PMBSF may function as a spatial frequency analyzer, with intrarow processing integrating a complementary set of spatial frequencies from the arcs in a single whisk.
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Base de dados:
MEDLINE
Assunto principal:
Orientação
/
Córtex Somatossensorial
/
Vibrissas
/
Potenciais Somatossensoriais Evocados
Limite:
Animals
Idioma:
En
Revista:
J Neurophysiol
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Estados Unidos