Tracking Multisite Seizure Propagation Using Ictal High-Gamma Activity

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Steven Tobochnik ◽  
Lisa M. Bateman ◽  
Cigdem I. Akman ◽  
Deepti Anbarasan ◽  
Carl W. Bazil ◽  
...  
Keyword(s):  
Gamma Activity ◽  
High Gamma ◽  
Seizure Propagation

scholarly journals Direct electrical stimulation of human cortex evokes high gamma activity that predicts conscious somatosensory perception

2018 ◽  
Vol 15 (2) ◽  
pp. 026015 ◽  
Author(s):  
Leah Muller ◽  
John D Rolston ◽  
Neal P Fox ◽  
Robert Knowlton ◽  
Vikram R Rao ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Gamma Activity ◽  
Direct Electrical Stimulation ◽  
Human Cortex ◽  
High Gamma ◽  
Stimulation Of

scholarly journals Comparison of subdural and subgaleal recordings of cortical high-gamma activity in humans

2016 ◽  
Vol 127 (1) ◽  
pp. 277-284 ◽  
Author(s):  
Jared D. Olson ◽  
Jeremiah D. Wander ◽  
Lise Johnson ◽  
Devapratim Sarma ◽  
Kurt Weaver ◽  
...  
Keyword(s):  
Gamma Activity ◽  
High Gamma

scholarly journals Prefrontal High Gamma in ECoG tags periodicity of musical rhythms in perception and imagination

2019 ◽  
Author(s):  
S. A. Herff ◽  
C. Herff ◽  
A. J. Milne ◽  
G. D. Johnson ◽  
J. J. Shih ◽  
...  
Keyword(s):  
Auditory Processing ◽  
Right Hemisphere ◽  
Brain Activity ◽  
Activity Patterns ◽  
Superior Temporal Gyrus ◽  
Gamma Activity ◽  
Rhythm Perception ◽  
High Gamma ◽  
The Right ◽  
Musical Rhythms

AbstractRhythmic auditory stimuli are known to elicit matching activity patterns in neural populations. Furthermore, recent research has established the particular importance of high-gamma brain activity in auditory processing by showing its involvement in auditory phrase segmentation and envelope-tracking. Here, we use electrocorticographic (ECoG) recordings from eight human listeners, to see whether periodicities in high-gamma activity track the periodicities in the envelope of musical rhythms during rhythm perception and imagination. Rhythm imagination was elicited by instructing participants to imagine the rhythm to continue during pauses of several repetitions. To identify electrodes whose periodicities in high-gamma activity track the periodicities in the musical rhythms, we compute the correlation between the autocorrelations (ACC) of both the musical rhythms and the neural signals. A condition in which participants listened to white noise was used to establish a baseline. High-gamma autocorrelations in auditory areas in the superior temporal gyrus and in frontal areas on both hemispheres significantly matched the autocorrelation of the musical rhythms. Overall, numerous significant electrodes are observed on the right hemisphere. Of particular interest is a large cluster of electrodes in the right prefrontal cortex that is active during both rhythm perception and imagination. This indicates conscious processing of the rhythms’ structure as opposed to mere auditory phenomena. The ACC approach clearly highlights that high-gamma activity measured from cortical electrodes tracks both attended and imagined rhythms.

Rapid and Minimum Invasive Functional Brain Mapping by Real-Time Visualization of High Gamma Activity During Awake Craniotomy

2014 ◽  
Vol 82 (5) ◽  
pp. 912.e1-912.e10 ◽  
Author(s):  
Hiroshi Ogawa ◽  
Kyousuke Kamada ◽  
Christoph Kapeller ◽  
Satoru Hiroshima ◽  
Robert Prueckl ◽  
...  
Keyword(s):  
Real Time ◽  
Brain Mapping ◽  
Awake Craniotomy ◽  
Gamma Activity ◽  
Functional Brain ◽  
Functional Brain Mapping ◽  
High Gamma ◽  
Real Time Visualization

Broadband High Gamma Activity as a Feature of Single Trial Brain Activation

NeuroImage ◽  
2009 ◽  
Vol 47 ◽  
pp. S171
Author(s):  
J.S. Gehring ◽  
J. Wentlandt ◽  
I. Mutschler ◽  
A. Schulze-Bonhage ◽  
A. Aertsen ◽  
...  
Keyword(s):  
Brain Activation ◽  
Gamma Activity ◽  
Single Trial ◽  
High Gamma

High-gamma activity in an attention network predicts individual differences in elderly adults' behavioral performance

NeuroImage ◽  
2014 ◽  
Vol 100 ◽  
pp. 290-300 ◽  
Author(s):  
Yoritaka Akimoto ◽  
Takayuki Nozawa ◽  
Akitake Kanno ◽  
Mizuki Ihara ◽  
Takakuni Goto ◽  
...  
Keyword(s):  
Individual Differences ◽  
Gamma Activity ◽  
Behavioral Performance ◽  
Elderly Adults ◽  
Attention Network ◽  
High Gamma

scholarly journals Differentiation of speech-induced artifacts from physiological high gamma activity in intracranial recordings

2021 ◽  
Author(s):  
Alan Bush ◽  
Anna Chrabaszcz ◽  
Victoria Peterson ◽  
Varun Saravanan ◽  
Christina Dastolfo-Hromack ◽  
...  
Keyword(s):  
Speech Production ◽  
Field Potential ◽  
Vibration Sensor ◽  
Gamma Activity ◽  
Time Frequency ◽  
Related Data ◽  
Syllable Repetition ◽  
Stereotactic Frame ◽  
High Gamma ◽  
Intracranial Recordings

AbstractThere is great interest in identifying the neurophysiological underpinnings of speech production. Deep brain stimulation (DBS) surgery is unique in that it allows intracranial recordings from both cortical and subcortical regions in patients who are awake and speaking. The quality of these recordings, however, may be affected to various degrees by mechanical forces resulting from speech itself. Here we describe the presence of speech-induced artifacts in local-field potential (LFP) recordings obtained from mapping electrodes, DBS leads, and cortical electrodes. In addition to expected physiological increases in high gamma (60-200 Hz) activity during speech production, time-frequency analysis in many channels revealed a narrowband gamma component that exhibited a pattern similar to that observed in the speech audio spectrogram. This component was present to different degrees in multiple types of neural recordings. We show that this component tracks the fundamental frequency of the participant’s voice, correlates with the power spectrum of speech and has coherence with the produced speech audio. A vibration sensor attached to the stereotactic frame recorded speech-induced vibrations with the same pattern observed in the LFPs. No corresponding component was identified in any neural channel during the listening epoch of a syllable repetition task. These observations demonstrate how speech-induced vibrations can create artifacts in the primary frequency band of interest. Identifying and accounting for these artifacts is crucial for establishing the validity and reproducibility of speech-related data obtained from intracranial recordings during DBS surgery.

scholarly journals High-gamma activity in the human hippocampus during inter-trial rest periods of a virtual navigation task

2018 ◽  
Author(s):  
Yi Pu ◽  
Brian R. Cornwell ◽  
Douglas Cheyne ◽  
Blake W. Johnson
Keyword(s):  
Gamma Oscillations ◽  
Gamma Activity ◽  
Training Set ◽  
Virtual Navigation ◽  
Navigation Task ◽  
Theta Power ◽  
Rest Periods ◽  
Synthetic Aperture Magnetometry ◽  
High Gamma ◽  
Gamma Power

AbstractIn rodents, hippocampal cell assemblies formed during learning of a navigation task are observed to re-emerge during resting (offline) periods, accompanied by high-frequency oscillations (HFOs). This phenomenon is believed to reflect mechanisms for strengthening newly-formed memory traces. Using magnetoencephalography recordings and a beamforming source location algorithm (synthetic aperture magnetometry), we investigated high-gamma (80 – 140 Hz) oscillations in the hippocampal region in 18 human participants during inter-trial rest periods in a virtual navigation task. We found right hippocampal gamma oscillations mirrored the pattern of theta power in the same region during navigation, varying as a function of environmental novelty. Gamma power during inter-trial rest periods was positively correlated with theta power during navigation in the first training set when the environment was new and predicted faster learning in the subsequent training set two where the environment became familiar. These findings provide evidence for human hippocampal reactivation accompanied by high-gamma activities immediately after learning and establish a link between hippocampal high-gamma activities and memory consolidation.

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