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Ripples reflect a spectrum of synchronous spiking activity in human anterior temporal lobe
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Ripples reflect a spectrum of synchronous spiking activity in human anterior temporal lobe
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Ripples reflect a spectrum of synchronous spiking activity in human anterior temporal lobe
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Journal Article
Ripples reflect a spectrum of synchronous spiking activity in human anterior temporal lobe
2021
Overview
Direct brain recordings have provided important insights into how high-frequency activity captured through intracranial EEG (iEEG) supports human memory retrieval. The extent to which such activity is comprised of transient fluctuations that reflect the dynamic coordination of underlying neurons, however, remains unclear. Here, we simultaneously record iEEG, local field potential (LFP), and single unit activity in the human temporal cortex. We demonstrate that fast oscillations within the previously identified 80–120 Hz ripple band contribute to broadband high-frequency activity in the human cortex. These ripple oscillations exhibit a spectrum of amplitudes and durations related to the amount of underlying neuronal spiking. Ripples in the macro-scale iEEG are related to the number and synchrony of ripples in the micro-scale LFP, which in turn are related to the synchrony of neuronal spiking. Our data suggest that neural activity in the human temporal lobe is organized into transient bouts of ripple oscillations that reflect underlying bursts of spiking activity.
