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Pattern-motion selectivity in the human pulvinar.

Abstract：

:On the basis of anatomical and physiological data obtained on animal models, we recently proposed that neurons in the main visual extrageniculate nuclei complex, the pulvinar, are actively involved in higher-order visual processing. Pulvinar neurons have been shown to integrate the component signals of a plaid pattern into a coherent global percept (pattern-motion selectivity). Using positron emission tomography (PET), we have investigated the possibility that the human pulvinar is also involved in plaid-defined higher-order motion integration. Plaid patterns were presented to normal observers in two conditions (coherent vs. transparent) created by varying the relative spatial frequency of the two gratings comprising the plaid. Regions of interest analysis revealed a significant activation of the pulvinar in the coherent condition supporting the notion that the human pulvinar nucleus is involved in higher-order motion processing. Plaid pattern activation was also observed in the medial temporal gyrus (area MT/V5), a motion area with strong anatomical connections to the pulvinar. These data provide the first direct evidence that the human pulvinar is involved in complex motion integration, as previously shown in animal models, and further support the existence of cortico-thalamo-cortical computational networks involved in higher-order visual processing.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Villeneuve MY,Kupers R,Gjedde A,Ptito M,Casanova C

doi

10.1016/j.neuroimage.2005.06.015

keywords:

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

474-80

issue

2

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(05)00424-6

journal_volume

28

pub_type

临床试验,杂志文章

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