Human neural responses involved in spatial pooling of locally ambiguous motion signals.

Abstract:

:Early visual motion signals are local and one-dimensional (1-D). For specification of global two-dimensional (2-D) motion vectors, the visual system should appropriately integrate these signals across orientation and space. Previous neurophysiological studies have suggested that this integration process consists of two computational steps (estimation of local 2-D motion vectors, followed by their spatial pooling), both being identified in the area MT. Psychophysical findings, however, suggest that under certain stimulus conditions, the human visual system can also compute mathematically correct global motion vectors from direct pooling of spatially distributed 1-D motion signals. To study the neural mechanisms responsible for this novel 1-D motion pooling, we conducted human magnetoencephalography (MEG) and functional MRI experiments using a global motion stimulus comprising multiple moving Gabors (global-Gabor motion). In the first experiment, we measured MEG and blood oxygen level-dependent responses while changing motion coherence of global-Gabor motion. In the second experiment, we investigated cortical responses correlated with direction-selective adaptation to the global 2-D motion, not to local 1-D motions. We found that human MT complex (hMT+) responses show both coherence dependency and direction selectivity to global motion based on 1-D pooling. The results provide the first evidence that hMT+ is the locus of 1-D motion pooling, as well as that of conventional 2-D motion pooling.

journal_name

J Neurophysiol

authors

Amano K,Takeda T,Haji T,Terao M,Maruya K,Matsumoto K,Murakami I,Nishida S

doi

10.1152/jn.00821.2011

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

3493-508

issue

12

eissn

0022-3077

issn

1522-1598

pii

jn.00821.2011

journal_volume

107

pub_type

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