Early recurrence and ongoing parietal driving during elementary visual processing

Gijs Plomp

doi:10.1038/srep18733

2015-12-22

Gijs Plomp *

Hervais-Adelman, Alexis

Laura Astolfi

Christoph M. Michel

DOI：10.1038/srep18733

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摘要

En 中文

Visual stimuli quickly activate a broad network of brain areas that often show reciprocal structural connections between them. Activity at short latencies (<100 ms) is thought to represent a feed-forward activation of widespread cortical areas, but fast activation combined with reciprocal connectivity between areas in principle allows for two-way, recurrent interactions to occur at short latencies after stimulus onset. Here we combined EEG source-imaging and Granger-causal modeling with high temporal resolution to investigate whether recurrent and top-down interactions between visual and attentional brain areas can be identified and distinguished at short latencies in humans. We investigated the directed interactions between widespread occipital, parietal and frontal areas that we localized within participants using fMRI. The connectivity results showed two-way interactions between area MT and V1 already at short latencies. In addition, the results suggested a large role for lateral parietal cortex in coordinating visual activity that may be understood as an ongoing top-down allocation of attentional resources. Our results support the notion that indirect pathways allow early, evoked driving from MT to V1 to highlight spatial locations of motion transients, while influence from parietal areas is continuously exerted around stimulus onset, presumably reflecting task-related attentional processes.

Keyword:

LATERAL OCCIPITAL COMPLEX

HIGH-RESOLUTION EEG

FEEDBACK CONNECTIONS

OBJECT RECOGNITION

CAUSAL RELATIONS

ATTENTION

AREA

CORTEX

RESPONSES