Publication: Optogenetic micro-electrocorticography for modulating and localizing cerebral cortex activity
Issued Date
2014-02-01
Resource Type
ISSN
17412552
17412560
17412560
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2-s2.0-84892715139
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Neural Engineering. Vol.11, No.1 (2014)
Suggested Citation
Thomas J. Richner, Sanitta Thongpang, Sarah K. Brodnick, Amelia A. Schendel, Ryan W. Falk, Lisa A. Krugner-Higby, Ramin Pashaie, Justin C. Williams Optogenetic micro-electrocorticography for modulating and localizing cerebral cortex activity. Journal of Neural Engineering. Vol.11, No.1 (2014). doi:10.1088/1741-2560/11/1/016010 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/33828
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Title
Optogenetic micro-electrocorticography for modulating and localizing cerebral cortex activity
Abstract
Objective. Spatial localization of neural activity from within the brain with electrocorticography (ECoG) and electroencephalography remains a challenge in clinical and research settings, and while microfabricated ECoG (micro-ECoG) array technology continues to improve, complementary methods to simultaneously modulate cortical activity while recording are needed. Approach. We developed a neural interface utilizing optogenetics, cranial windowing, and micro-ECoG arrays fabricated on a transparent polymer. This approach enabled us to directly modulate neural activity at known locations around micro-ECoG arrays in mice expressing Channelrhodopsin-2. We applied photostimuli varying in time, space and frequency to the cortical surface, and we targeted multiple depths within the cortex using an optical fiber while recording micro-ECoG signals. Main results. Negative potentials of up to 1.5 mV were evoked by photostimuli applied to the entire cortical window, while focally applied photostimuli evoked spatially localized micro-ECoG potentials. Two simultaneously applied focal stimuli could be separated, depending on the distance between them. Photostimuli applied within the cortex with an optical fiber evoked more complex micro-ECoG potentials with multiple positive and negative peaks whose relative amplitudes depended on the depth of the fiber. Significance. Optogenetic ECoG has potential applications in the study of epilepsy, cortical dynamics, and neuroprostheses. © 2014 IOP Publishing Ltd.