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• W2130258905 abstract "Attending a certain region in space enhances activity in visual areas retinotopically mapped to this region; stimuli presented in this region are preferentially processed. The zoom lens model of visual attention proposes that the attended region can be adjusted in size and predicts a tradeoff between its size and processing efficiency because of limited processing capacities. By means of event-related functional magnetic resonance imaging, we analyzed neural activity in multiple visual areas as a function of the size of an attended visual field region, which was defined by a spatial cue stimulus. After cueing, a target object, defined by a specific feature conjunction, had to be identified among objects within the cued region. Neural activity preceding the objects in multiple retinotopic visual areas correlated with the size of the attended region, as did subjects9 performance. While the extent of activated retinotopic visual cortex increased with the size of the attended region, the level of neural activity in a given subregion decreased. These findings are consistent with the physiological predictions of the zoom lens model. Size-related modulations of neural activity were pronounced in early visual areas. We relate this finding to the small receptive field of these areas, whereby only neuronal units with receptive fields covering the attended region received a top-down bias. This preactivation of neuronal units may then have gated selective processing of the features of the object that appeared at the attended location, thus enabling feature integration and object identification." @default.
• W2130258905 created "2016-06-24" @default.
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• W2130258905 date "2003-05-01" @default.
• W2130258905 modified "2023-10-10" @default.
• W2130258905 title "A Physiological Correlate of the “Zoom Lens” of Visual Attention" @default.
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• W2130258905 doi "https://doi.org/10.1523/jneurosci.23-09-03561.2003" @default.
• W2130258905 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6742201" @default.
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