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Decoding of Attentional State Using High-Frequency Local Field Potential Is As Accurate As Using Spikes

Prakash, SS and Das, A and Kanth, ST and Mayo, JP and Ray, S (2021) Decoding of Attentional State Using High-Frequency Local Field Potential Is As Accurate As Using Spikes. Cerebral Cortex, 31 (9). 4314 - 4328. ISSN 1047-3211

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Abstract

Local field potentials (LFPs) in visual cortex are reliably modulated when the subject's focus of attention is cued into versus out of the receptive field of the recorded sites, similar to modulation of spikes. However, human psychophysics studies have used an additional attention condition, neutral cueing, for decades. The effect of neutral cueing on spikes was examined recently and found to be intermediate between cued and uncued conditions. However, whether LFPs are also precise enough to represent graded states of attention is unknown. We found in rhesus monkeys that LFPs during neutral cueing were also intermediate between cued and uncued conditions. For a single electrode, attention was more discriminable using high frequency (>30 Hz) LFP power than spikes, which is expected because LFP represents a population signal and therefore is expected to be less noisy than spikes. However, previous studies have shown that when multiple electrodes are used, spikes can outperform LFPs. Surprisingly, in our study, spikes did not outperform LFPs when discriminability was computed using multiple electrodes, even though the LFP activity was highly correlated across electrodes compared with spikes. These results constrain the spatial scale over which attention operates and highlight the usefulness of LFPs in studying attention.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Prakash, SS
Das, A
Kanth, ST
Mayo, JPMAYOJP@pitt.eduMAYOJP
Ray, S
Date: 1 September 2021
Date Type: Publication
Journal or Publication Title: Cerebral Cortex
Volume: 31
Number: 9
Page Range: 4314 - 4328
DOI or Unique Handle: 10.1093/cercor/bhab088
Schools and Programs: School of Medicine > Ophthalmology
Refereed: Yes
ISSN: 1047-3211
Date Deposited: 18 Oct 2021 19:16
Last Modified: 20 Oct 2021 04:55
URI: http://d-scholarship.pitt.edu/id/eprint/41860

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