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Cross-adaptation combined with TMS reveals a functional overlap between vision and imagery in the early visual cortex.

Abstract：

:The extent to which the generation of mental images draws on the neuronal representations involved in visual perception has been the subject of much debate. To investigate this overlap, we assessed whether adaptation to visual stimuli affects the ability to generate visual mental images; such cross-adaptation would indicate shared neural representations between visual perception and imagery. Mental imagery was tested using a modified version of the clock task, in which subjects are presented with a digital time (e.g. "2.15") and are asked to generate a mental image of the clock hands displaying this time on an empty clock face. Participants were adapted to oriented lines either on the upper or lower side of the clock face prior to the mental image generation. The results showed that mental imagery was impaired when the mental image had to be generated in the adapted region of visual space (Experiment 1). In Experiment 2, we used TMS to determine whether this adaptation effect occurs in the early visual cortex (EVC; V1/V2). Relative to control conditions (No TMS and Vertex TMS), EVC TMS facilitated mental imagery generation when the mental image spatially overlapped with the adapter. Our results thus show that neuronal representations in the EVC which encode (and are suppressed by) visual input play a causal role in visual mental imagery.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Cattaneo Z,Bona S,Silvanto J

doi

10.1016/j.neuroimage.2011.10.022

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

3015-20

issue

3

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(11)01185-2

journal_volume

59

pub_type

杂志文章

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