The right posterior parietal cortex mediates spatial reorienting of attentional choice bias

Ankita Sengupta, Sanjna Banerjee, Suhas Ganesh, Shrey Grover and Devarajan Sridharan ()
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Ankita Sengupta: Indian Institute of Science
Sanjna Banerjee: Indian Institute of Science
Suhas Ganesh: Indian Institute of Science
Shrey Grover: Indian Institute of Science
Devarajan Sridharan: Indian Institute of Science

Nature Communications, 2024, vol. 15, issue 1, 1-19

Abstract: Abstract Attention facilitates behavior by enhancing perceptual sensitivity (sensory processing) and choice bias (decisional weighting) for attended information. Whether distinct neural substrates mediate these distinct components of attention remains unknown. We investigate the causal role of key nodes of the right posterior parietal cortex (rPPC) in the forebrain attention network in sensitivity versus bias control. Two groups of participants performed a cued attention task while we applied either inhibitory, repetitive transcranial magnetic stimulation (n = 28) or 40 Hz transcranial alternating current stimulation (n = 26) to the dorsal rPPC. We show that rPPC stimulation – with either modality – impairs task performance by selectively altering attentional modulation of bias but not sensitivity. Specifically, participants’ bias toward the uncued, but not the cued, location reduced significantly following rPPC stimulation – an effect that was consistent across both neurostimulation cohorts. In sum, the dorsal rPPC causally mediates the reorienting of choice bias, one particular component of visual spatial attention.

Date: 2024
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DOI: 10.1038/s41467-024-51283-z

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