Pattern motion representation in primary visual cortex is mediated by transcortical feedback

Schmidt, Kerstin Erika; Lomber, S.G.; Payne, B.R.; Galuske, R.A.W.

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Campo DC	Valor	Idioma
dc.contributor.author	Schmidt, Kerstin Erika	-
dc.contributor.author	Lomber, S.G.	-
dc.contributor.author	Payne, B.R.	-
dc.contributor.author	Galuske, R.A.W.	-
dc.date.accessioned	2017-05-26T15:01:23Z	-
dc.date.available	2017-05-26T15:01:23Z	-
dc.date.issued	2011	-
dc.identifier.issn	1053-8119	-
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/23122	-
dc.language	eng	pt_BR
dc.rights	Acesso Aberto	pt_BR
dc.subject	Pattern motion representation	pt_BR
dc.subject	primary visual cortex	pt_BR
dc.subject	transcortical feedback	pt_BR
dc.title	Pattern motion representation in primary visual cortex is mediated by transcortical feedback	pt_BR
dc.type	article	pt_BR
dc.description.resumo	A highly important question in visual neuroscience is to identify where in the visual system information from different processing channels is integrated to form the complex scenery we perceive. A common view to this question is that information is processed hierarchically because small and selective receptive fields in lower visual areas melt into larger receptive fields in specialized higher visual areas. However, a higher order area in which all incoming signals ultimately converge has not yet been identified. Rather, modulation of subthreshold influences from outside the classical receptive field related to contextual integration occurs already in early visual areas. So far it is unclear how these influences are mediated (Gilbert, 1998; Angelucci and Bullier, 2003; Gilbert and Sigman, 2007). In the present study, we show that feedback connections from a higher motion processing area critically influence the integration of subthreshold global motion cues in early visual areas. Global motion cues are theoretically not discernible for a local motion detector in V1, however, imprints of pattern motion have been observed in this area (Guo et al., 2004; Schmidt et al., 2006). By combining reversible thermal deactivation and optical imaging of intrinsic signals we demonstrate that feedback signals from the posteromedial suprasylvian sulcus are critical for the discrimination between global and local motions already in early visual areas. These results suggest that global features of the visual scenery are fed back to lower visual processing units in order to facilitate the integration of local cues into a global construct.	pt_BR
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