Kanth, ST and Ray, S (2020) Electrocorticogram (ECOG) is highly informative in primate visual cortex. In: Journal of Neuroscience, 40 (12). pp. 2430-2444.
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Abstract
Neural signals recorded at different scales contain information about environment and behavior and have been used to control Brain Machine Interfaces with varying degrees of success. However, a direct comparison of their efficacy has not been possible due to different recording setups, tasks, species, etc. To address this, we implanted customized arrays having both microelectrodes and electrocorticogram (ECoG) electrodes in the primary visual cortex of 2 female macaque monkeys, and also recorded electroencephalogram (EEG), while they viewed a variety of naturalistic images and parametric gratings. Surprisingly, ECoG had higher information and decodability than all other signals. Combining a few ECoG electrodes allowed more accurate decoding than combining a much larger number of microelectrodes. Control analyses showed that higher decoding accuracy of ECoG compared with local field potential was not because of differences in low-level visual features captured by them but instead because of larger spatial summation of the ECoG. Information was high in the 30 - 80 Hz range and at lower frequencies. Information in different frequencies and scales was nonredundant. These results have strong implications for Brain Machine Interface applications and for study of population representation of visual stimuli. © 2020 the authors.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Neuroscience |
| Publisher: | Society for Neuroscience |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | adult; animal experiment; Article; controlled study; electrocorticography; electroencephalogram; female; frequency; local field potential; Macaca; measurement accuracy; nonhuman; primate; priority journal; spatial summation; striate cortex; vision; visual stimulation; animal; animal behavior; brain computer interface; brain mapping; electrode implant; electroencephalography; electrophysiology; Macaca radiata; microelectrode; photostimulation; physiology; visual cortex; visual evoked potential, Animals; Behavior, Animal; Brain Mapping; Brain-Computer Interfaces; Electrocorticography; Electrodes, Implanted; Electroencephalography; Electrophysiological Phenomena; Evoked Potentials, Visual; Female; Macaca radiata; Microelectrodes; Photic Stimulation; Visual Cortex |
| Department/Centre: | Division of Biological Sciences > Centre for Neuroscience |
| Date Deposited: | 24 Jan 2023 07:12 |
| Last Modified: | 24 Jan 2023 07:12 |
| URI: | https://eprints.iisc.ac.in/id/eprint/79393 |
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