Oletto Carolina Maria, Contemori Giulio, Bertamini Marco, Battaglini Luca
Department of General Psychology, University of Padova, 35131 Padova, Italy.
NeuroSci. 2022 Dec 23;4(1):9-17. doi: 10.3390/neurosci4010002. eCollection 2023 Mar.
Foveal (central) and peripheral vision are strongly interconnected to provide an integrated experience of the world around us. Recently, it has been suggested that there is a feedback mechanism that links foveal and peripheral vision. This peripheral-to-foveal feedback differs from other feedback mechanisms in that during visual processing a novel representation of a stimulus is formed in a different cortical region than that of the feedforward representation. The functional role of foveal feedback is not yet completely understood, but some evidence from neuroimaging studies suggests a link with peripheral shape processing. Behavioural and transcranial magnetic stimulation studies show impairment in peripheral shape discrimination when the foveal retinotopic cortex is disrupted post stimulus presentation. This review aims to link these findings to the visual sketchpad hypothesis. According to this hypothesis, foveal retinotopic cortex stores task-relevant information to aid identification of peripherally presented objects. We discuss how the characteristics of foveal feedback support this hypothesis and rule out other possible explanations. We also discuss the possibility that the foveal feedback may be independent of the sensory modality of the stimulation.
中央凹（中心）视觉和周边视觉紧密相连，为我们提供对周围世界的综合体验。最近，有人提出存在一种将中央凹视觉和周边视觉联系起来的反馈机制。这种从周边到中央凹的反馈与其他反馈机制不同，因为在视觉处理过程中，刺激的一种新表征是在与前馈表征不同的皮层区域形成的。中央凹反馈的功能作用尚未完全明确，但神经影像学研究的一些证据表明它与周边形状处理有关。行为学和经颅磁刺激研究表明，在刺激呈现后破坏中央凹视网膜拓扑皮层时，周边形状辨别会受损。本综述旨在将这些发现与视觉工作记忆假说联系起来。根据这一假说，中央凹视网膜拓扑皮层存储与任务相关的信息，以帮助识别周边呈现的物体。我们将讨论中央凹反馈的特征如何支持这一假说，并排除其他可能的解释。我们还将讨论中央凹反馈可能独立于刺激感觉模态的可能性。
