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• W2001127486 abstract "Processing of multiple or bilateral conditions presented simultaneously in both hemifields reflects the natural mode of perception in our multi-target environment, but is not yet completely understood. While region-of-interest based studies in healthy subjects reported single cortical areas as the right inferior parietal lobe (IPL) or temporoparietal junction (TPJ) to process bilateral conditions, studies in extinction patients with reduced ability in this regard suggested the right superior temporal cortex to hold a key role. The present fMRI study on healthy subjects aimed at resolving these discrepancies by contrasting bilateral versus unilateral visual conditions in a paradigm similar to the bed-side test for patients with visual extinction on a whole brain level. Additionally, reduced attentional capacity in spatial processing was investigated in normal aging. Processing of bilateral conditions compared to unilateral ones showed to require stronger activation of not one single cortical region but the entire right-lateralized ventral attention network, bilateral parietal and visual association areas. These results might suggest a conceptual difference between unilateral and bilateral spatial processing with the latter depending on additional anatomical and functional brain resources. Reduced attentional capacity in elderly subjects was associated with compensatory recruitment of contralateral functional homologues [left IPL, TPJ, frontal eye field (FEF)]. These data reveal the functional anatomy of our ability to visually process and respond to the entity of the environment and improve our understanding of neglect and extinction. Moreover, the data demonstrate that a restriction of the attentional capacity is based on processing limitations in the network of high-level cortical areas and not due to restriction in the primary sensory ones." @default.
• W2001127486 created "2016-06-24" @default.
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• W2001127486 date "2015-05-01" @default.
• W2001127486 modified "2023-09-27" @default.
• W2001127486 title "Processing of bilateral versus unilateral conditions: Evidence for the functional contribution of the ventral attention network" @default.
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• W2001127486 doi "https://doi.org/10.1016/j.cortex.2015.02.018" @default.
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