Callosal influence on visual receptive fields has an ocular, an orientation-and direction bias

Conde-Ocazionez, Sergio A.; Jungen, Christiane; Wunderle, Thomas; Eriksson, David; Maciel, Sergio Tulio Neuenschwander; Schmidt, Kerstin Erika

Callosal influence on visual receptive fields has an ocular, an orientation-and direction bias

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dc.contributor.author	Conde-Ocazionez, Sergio A.
dc.contributor.author	Jungen, Christiane
dc.contributor.author	Wunderle, Thomas
dc.contributor.author	Eriksson, David
dc.contributor.author	Maciel, Sergio Tulio Neuenschwander
dc.contributor.author	Schmidt, Kerstin Erika
dc.date.accessioned	2018-04-26T16:42:20Z
dc.date.available	2018-04-26T16:42:20Z
dc.date.issued	2018-04-16
dc.description.resumo	One leading hypothesis on the nature of visual callosal connections (CC) is that they replicate features of intrahemispheric lateral connections. However, CC act also in the central part of the binocular visual field. In agreement, early experiments in cats indicated that they provide the ipsilateral eye part of binocular receptive fields (RFs) at the vertical midline (Berlucchi and Rizzolatti, 1968), and play a key role in stereoscopic function. But until today callosal inputs to receptive fields activated by one or both eyes were never compared simultaneously, because callosal function has been often studied by cutting or lesioning either corpus callosum or optic chiasm not allowing such a comparison. To investigate the functional contribution of CC in the intact cat visual system we recorded both monocular and binocular neuronal spiking responses and receptive fields in the 17/18 transition zone during reversible deactivation of the contralateral hemisphere. Unexpectedly from many of the previous reports, we observe no change in ocular dominance during CC deactivation. Throughout the transition zone, a majority of RFs shrink, but several also increase in size. RFs are significantly more affected for ipsi- as opposed to contralateral stimulation, but changes are also observed with binocular stimulation. Noteworthy, RF shrinkages are tiny and not correlated to the profound decreases of monocular and binocular firing rates. They depend more on orientation and direction preference than on eccentricity or ocular dominance of the receiving neuron's RF. Our findings confirm that in binocularly viewing mammals, binocular RFs near the midline are constructed via the direct geniculo-cortical pathway. They also support the idea that input from the two eyes complement each other through CC: Rather than linking parts of RFs separated by the vertical meridian, CC convey a modulatory influence, reflecting the feature selectivity of lateral circuits, with a strong cardinal bias.	pt_BR
dc.identifier.citation	CONDE-OCAZIONEZ, S. A. et al. Callosal influence on visual receptive fields has an ocular, an orientation-and direction bias. [s.l.], Front. Syst. Neurosci., v. 12, p. 11, abr./2018.	pt_BR
dc.identifier.doi	10.3389/fnsys.2018.00011
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/25086
dc.language	eng	pt_BR
dc.rights	Acesso Aberto	pt_BR
dc.subject	interhemispheric connectivity	pt_BR
dc.subject	orientation selectivity	pt_BR
dc.subject	binocular	pt_BR
dc.subject	monocular	pt_BR
dc.subject	anticipation	pt_BR
dc.title	Callosal influence on visual receptive fields has an ocular, an orientation-and direction bias	pt_BR
dc.type	article	pt_BR