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A Common Parieto-Frontal Network Is Recruited Under Both Low Visibility and High Perceptual Interference Conditions

¹Department of Psychology, Vanderbilt Vision Research Center, Vanderbilt University, Nashville 37203; and ²Vanderbilt University Institute of Imaging Science, Nashville, Tennessee 37232-2675

Submitted 3 November 2003; accepted in final form 30 June 2004

A fundamental property of visual attention is to select targets from interfering distractors. However, attention can also facilitate the detectability of near-threshold items presented in isolation. The extent to which these two perceptually challenging conditions are resolved by the same neural mechanisms is not well known. In the present event-related fMRI experiment, subjects performed a letter identification task under two perceptually challenging conditions; when the luminance contrast of a target letter was reduced (perceptual visibility manipulation) and when the target letter was flanked by distractors (perceptual interference manipulation). Perceptual interference recruited the right parietal and mid-lateral frontal cortex, while perceptual visibility activated these regions bilaterally. The overlap of activated areas between the two perceptual manipulations suggests that a single parieto-frontal network is summoned under both perceptual visibility and interference conditions.

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