Attention and primary visual cortex

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Commentary Attention and primary visual cortex

Evidence for attentional modulation of responses in primary visual cortex has been a matter of considerable debate. The classical notion concerning attention effects in visual cortex has held that the strongest effects are seen at the highest levels of the visual pathway, and that in primary visual cortex there is no effect of attention. The report by Somers et al. (1) of a functional MRI study...

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Interactions between attention, context and learning in primary visual cortex

Attention in early visual processing engages the higher order, context dependent properties of neurons. Even at the earliest stages of visual cortical processing neurons play a role in intermediate level vision - contour integration and surface segmentation. The contextual influences mediating this process may be derived from long range connections within primary visual cortex (V1). These influ...

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Spatial attention affects brain activity in human primary visual cortex.

Functional MRI was used to test whether instructing subjects to attend to one or another location in a visual scene would affect neural activity in human primary visual cortex. Stimuli were moving gratings restricted to a pair of peripheral, circular apertures, positioned to the right and to the left of a central fixation point. Subjects were trained to perform a motion discrimination task, att...

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Popout modulates focal attention in the primary visual cortex.

The influence of context-dependent interactions on attention-related neural activity was studied in the human primary visual cortex (V1) with event-related fMRI. Retinotopic field-sign mapping was used to determine the localization of V1 with respect to adjacent retinotopic areas. Observers reported the orientation of a Gabor patch at pre-cued extrafoveal locations when it was salient among dis...

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Topography of attention in the primary visual cortex.

Previous research suggests that feedback circuits mediate the effect of attention to the primary visual cortex (V1). This inference is mainly based on temporal information of the responses, where late modulation is associated with feedback signals. However, temporal data alone are inconclusive because the anatomical hierarchy between cortical areas differs significantly from the temporal sequen...

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ژورنال

عنوان ژورنال: Proceedings of the National Academy of Sciences

سال: 1999

ISSN: 0027-8424,1091-6490

DOI: 10.1073/pnas.96.6.2585