POSTER DETAILS
Attention-dependent modulation of monkey V1 epidural field potentials is closely linked to behavioral performance
Dan Qi Priscilla Oh
Date / Location: Monday, 11 July 2022 / S03-485
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Epidural multielectrode arrays constitute a key technique for future clinical applications and offer interesting options for basic science research, because of their reduced invasiveness and high coverage density. Visual epidural field potentials (EFPs) were recently shown to possess high selectivity regarding basic visual stimulus features, but selectivity during cognitive processing has only rarely been studied. We here investigate neural signatures of selective visual attention in EFPs and their correlation to signatures of attention in behavioral data by recording EFPs from monkey primary visual cortex (V1) during a covert-attention task. Monkeys were allowed to respond to a slight orientation change in both the cued and uncued object. A non-binary rewarding scheme (Fischer & Wegener, 2019) was used to support either more distributed or more selective attention. We hypothesized that attentional modulation of the EFP should follow the strength of behavioral effects in the two reward regimes. Reaction time (RT) differences for responses to cued and uncued changes were found to be significantly larger in the regime supporting more selective attention. Accordingly, gamma-band power of EFPs showed an attentional modulation of about 50% with selective attention but only a weak modulation with distributed attention. Attentional modulation was strongest in trials with fast responses as compared to trials with medium or slow responses. The strength of attentional modulation significantly decreased with increasing distance from the attended object, consistent with a spatial attention field. The results show that EFPs from monkey V1 are strongly modulated by attention and closely linked to behavioral performance.