Suppressive Interactions between Nearby Stimuli in Visual Cortex Reflect Crowding.

IF 3 3区 医学 Q2 NEUROSCIENCES
Leili Soo, Plamen A Antonov, Ramakrishna Chakravarthi, Søren K Andersen
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引用次数: 0

Abstract

Crowding is a phenomenon in which visual object identification is impaired by the close proximity of other stimuli. The neural processes leading to object recognition and its breakdown as seen in crowding are still debated. To assess how crowding affects the processing of stimuli in visual cortex, we recorded steady-state visual evoked potentials (SSVEPs) elicited by flickering target and flanker stimuli while manipulating the spacing of these stimuli (Experiment 1) as well as target similarity (Experiment 2). Participants who performed an orientation discrimination task while proportion correct, along with frequency-tagged SSVEPs elicited by target and flanker stimuli, were recorded. Decreasing target-flanker distance reduced both behavioral performance and target-elicited SSVEP amplitudes. Estimates of the critical spacing, a measure of the spatial extent of crowding, from both behavioral data and SSVEP amplitudes were similar. In addition, manipulating target similarity affected both measures in the same way. These findings establish a clear connection between the suppression of stimulus processing by nearby flankers in visual cortex and crowding, and demonstrate the usefulness of SSVEPs in studying the cortical mechanisms of visual crowding.

视觉皮层附近刺激之间的抑制性相互作用反映了拥挤。
拥挤是一种现象,在这种现象中,视觉对象识别受到其他刺激的近距离影响。导致物体识别的神经过程及其在拥挤中看到的崩溃仍然存在争议。为了评估拥挤如何影响视觉皮层对刺激的处理,我们记录了闪烁的目标和侧翼刺激在操纵这些刺激的间隔(实验1)和目标相似性(实验2)时引发的稳态视觉诱发电位(ssvep)。在比例正确的情况下执行定向辨别任务的参与者,以及由目标和侧侧刺激引发的频率标记的ssvep,被记录下来。目标与侧卫距离的减小降低了行为表现和目标诱发的SSVEP振幅。从行为数据和SSVEP振幅中估计的临界间距(拥挤的空间程度的度量)是相似的。此外,操纵目标相似性以相同的方式影响两种测量。这些发现建立了视觉皮层侧侧刺激加工的抑制与拥挤之间的明确联系,并证明了ssvep在研究视觉拥挤的皮层机制方面的有用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Cognitive Neuroscience
Journal of Cognitive Neuroscience 医学-神经科学
CiteScore
5.30
自引率
3.10%
发文量
151
审稿时长
3-8 weeks
期刊介绍: Journal of Cognitive Neuroscience investigates brain–behavior interaction and promotes lively interchange among the mind sciences.
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