Habituation of phase-locked local field potentials and gamma-band oscillations recorded from the human insula

Scientific Reports
Giulia LiberatiAndré Mouraux

Abstract

Salient nociceptive and non-nociceptive stimuli elicit low-frequency local field potentials (LFPs) in the human insula. Nociceptive stimuli also elicit insular gamma-band oscillations (GBOs), possibly preferential for thermonociception, which have been suggested to reflect the intensity of perceived pain. To shed light on the functional significance of these two responses, we investigated whether they would be modulated by stimulation intensity and temporal expectation - two factors contributing to stimulus saliency. Insular activity was recorded from 8 depth electrodes (41 contacts) implanted in the left insula of 6 patients investigated for epilepsy. Thermonociceptive, vibrotactile, and auditory stimuli were delivered using two intensities. To investigate the effects of temporal expectation, the stimuli were delivered in trains of three identical stimuli (S1-S2-S3) separated by a constant 1-s interval. Stimulation intensity affected intensity of perception, the magnitude of low-frequency LFPs, and the magnitude of nociceptive GBOs. Stimulus repetition did not affect perception. In contrast, both low-frequency LFPs and nociceptive GBOs showed a marked habituation of the responses to S2 and S3 as compared to S1 and, hence, a di...Continue Reading

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Citations

May 31, 2018·Scientific Reports·Qiaosheng ZhangJing Wang
Aug 14, 2019·Pain Reports·Marco Luciano LoggiaIrene Tracey
Sep 29, 2020·The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry·Junseok A Kim, Karen D Davis

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