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• W2169455683 abstract "BackgroundThe integration of EEG recordings and transcranial neuromodulation has provided a useful construct for noninvasively investigating the modification of human brain circuit activity. Recent evidence has demonstrated that focused ultrasound can be targeted through the human skull to affect the amplitude of somatosensory evoked potentials and its associated spectral content.Objective/hypothesisThe present study tests whether focused ultrasound transmitted through the human skull and targeted to somatosensory cortex can affect the phase and phase rate of cortical oscillatory dynamics.MethodsA computational model was developed to gain insight regarding the insertion behavior of ultrasound induced pressure waves in the human head. The instantaneous phase and phase rate of EEG recordings before, during, and after transmission of transcranial focused ultrasound (tFUS) to human somatosensory cortex were examined to explore its effects on phase dynamics.ResultsComputational modeling results show the skull effectively reinforces the focusing of tFUS due to curvature of material interfaces. Neurophysiological recordings show that tFUS alters the phase distribution of intrinsic brain activity for beta frequencies, but not gamma. This modulation was accompanied by a change in phase rate of both beta and gamma frequencies. Additionally, tFUS modulated phase distributions in the beta band of early sensory-evoked activity but did not affect late sensory-evoked activity, lending support to the spatial specificity of tFUS for neuromodulation. This spatial specificity was confirmed through an additional experiment where the ultrasound transducer was moved 1 cm laterally from the original cortical target.ConclusionsFocused ultrasonic energy can alter EEG oscillatory dynamics through local mechanical perturbation of discrete cortical circuits." @default.
• W2169455683 created "2016-06-24" @default.
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• W2169455683 date "2014-11-01" @default.
• W2169455683 modified "2023-09-29" @default.
• W2169455683 title "Transcranial Focused Ultrasound Modulates Intrinsic and Evoked EEG Dynamics" @default.
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• W2169455683 doi "https://doi.org/10.1016/j.brs.2014.08.008" @default.
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