Cross-adaptation combined with TMS reveals a functional overlap between vision and imagery in the early visual cortex
Cross-adaptation combined with TMS reveals a functional overlap between vision and imagery in the early visual cortex
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DOI：
10.1016/j.neuroimage.2011.10.022
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发表时间：
2012-02-01
期刊：
影响因子：
5.7
通讯作者：
Silvanto, Juha
中科院分区：
文献类型：
--
作者：
Cattaneo, Zaira;Bona, Silvia;Silvanto, Juha
心理意象的产生在多大程度上依赖于与视觉感知有关的神经元表征，这一直是一个备受争议的话题。为了研究这种重叠，我们评估了对视觉刺激的适应是否会影响产生视觉心理图像的能力;这种交叉适应表明视觉感知和图像之间存在共同的神经表征。心理意象测试使用修改版本的时钟任务，其中受试者与数字时间（例如“2.15”），并要求产生一个心理图像的时钟指针显示这个时间在一个空的钟面。参与者适应的定向线无论是在上或下的时钟面之前的心理图像生成。结果表明，当心理意象必须在视觉空间的适应区产生时，心理意象受损（实验1）。在实验2中，我们使用TMS来确定这种适应效应是否发生在早期视觉皮层（EVC; V1/V2）。相对于控制条件（无TMS和顶点TMS），EVC TMS促进心理意象的产生时，心理意象空间重叠的适配器。因此，我们的研究结果表明，在EVC的编码（和抑制）视觉输入的神经表征发挥了因果作用的视觉心理意象。(C)2011 Elsevier Inc. All rights reserved.
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. (C) 2011 Elsevier Inc. All rights reserved.