scholarly journals Gamma-rhythmic Gain Modulation

2016 ◽  
Author(s):  
Jianguang Ni ◽  
Thomas Wunderle ◽  
Christopher M. Lewis ◽  
Robert Desimone ◽  
Ilka Diester ◽  
...  
Keyword(s):  
Neuronal Response ◽  
Effective Connectivity ◽  
Reaction Times ◽  
Gamma Band ◽  
Gain Modulation ◽  
Area V4 ◽  
Gamma Rhythm ◽  
Area 21A ◽  
Gamma Band Activity ◽  
Band Activity

SummaryCognition requires the dynamic modulation of effective connectivity, i.e. the modulation of the postsynaptic neuronal response to a given input. If postsynaptic neurons are rhythmically active, this might entail rhythmic gain modulation, such that inputs synchronized to phases of high gain benefit from enhanced effective connectivity. We show that visually induced gamma-band activity in awake macaque area V4 rhythmically modulates responses to unpredictable stimulus events. This modulation exceeded a simple additive superposition of a constant response onto ongoing gamma-rhythmic firing, demonstrating the modulation of multiplicative gain. Gamma phases leading to strongest neuronal responses also led to shortest behavioral reaction times, suggesting functional relevance of the effect. Furthermore, we find that constant optogenetic stimulation of anesthetized cat area 21a produces gamma-band activity entailing a similar gain modulation. As the gamma rhythm in area 21a did not spread backwards to area 17, this suggests that postsynaptic gamma is sufficient for gain modulation.

Gamma band activity in an auditory oddball paradigm studied with the wavelet transform

2001 ◽  
Vol 112 (7) ◽  
pp. 1219-1228 ◽  
Author(s):  
I.G Gurtubay ◽  
M Alegre ◽  
A Labarga ◽  
A Malanda ◽  
J Iriarte ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Gamma Band ◽  
Oddball Paradigm ◽  
Auditory Oddball ◽  
Gamma Band Activity ◽  
Auditory Oddball Paradigm ◽  
Band Activity

scholarly journals Increased Thalamic Gamma Band Activity Correlates with Symptom Relief following Deep Brain Stimulation in Humans with Tourette’s Syndrome

PLoS ONE ◽  
2012 ◽  
Vol 7 (9) ◽  
pp. e44215 ◽  
Author(s):  
Nicholas Maling ◽  
Rowshanak Hashemiyoon ◽  
Kelly D. Foote ◽  
Michael S. Okun ◽  
Justin C. Sanchez
Keyword(s):  
Deep Brain Stimulation ◽  
Brain Stimulation ◽  
Symptom Relief ◽  
Gamma Band ◽  
Tourette's Syndrome ◽  
Tourette’S Syndrome ◽  
Gamma Band Activity ◽  
Band Activity ◽  
Deep Brain

Gamma band activity and its synchronization reflect the dysfunctional emotional processing in alexithymic persons

2006 ◽  
Vol 43 (6) ◽  
pp. 533-540 ◽  
Author(s):  
Atsushi Matsumoto ◽  
Yoko Ichikawa ◽  
Noriaki Kanayama ◽  
Hideki Ohira ◽  
Tetsuya Iidaka
Keyword(s):  
Emotional Processing ◽  
Gamma Band ◽  
Gamma Band Activity ◽  
Band Activity

scholarly journals FEF-Controlled Alpha Delay Activity Precedes Stimulus-Induced Gamma-Band Activity in Visual Cortex

2017 ◽  
Vol 37 (15) ◽  
pp. 4117-4127 ◽  
Author(s):  
Tzvetan Popov ◽  
Sabine Kastner ◽  
Ole Jensen
Keyword(s):  
Visual Cortex ◽  
Gamma Band ◽  
Gamma Band Activity ◽  
Band Activity

scholarly journals Increased EEG gamma band activity in Alzheimer’s disease and mild cognitive impairment

2008 ◽  
Vol 115 (9) ◽  
pp. 1301-1311 ◽  
Author(s):  
J. A. van Deursen ◽  
E. F. P. M. Vuurman ◽  
F. R. J. Verhey ◽  
V. H. J. M. van Kranen-Mastenbroek ◽  
W. J. Riedel
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Gamma Band ◽  
Gamma Band Activity ◽  
Band Activity

Interictal Abnormalities of Gamma Band Activity in Visual Evoked Responses in Migraine: An Indication of Thalamocortical Dysrhythmia?

Cephalalgia ◽  
2007 ◽  
Vol 27 (12) ◽  
pp. 1360-1367 ◽  
Author(s):  
G Coppola ◽  
A Ambrosini ◽  
L Di Clemente ◽  
D Magis ◽  
A Fumal ◽  
...  
Keyword(s):  
High Frequency ◽  
Gamma Band ◽  
Pattern Reversal ◽  
Evoked Responses ◽  
Visual Evoked Responses ◽  
High Frequency Oscillations ◽  
Thalamocortical Dysrhythmia ◽  
Gamma Band Activity ◽  
Band Activity ◽  
Visual Evoked

Between attacks, migraineurs lack habituation in standard visual evoked potentials (VEPs). Visual stimuli also evoke high-frequency oscillations in the gamma band range (GBOs, 20–35 Hz) assumed to be generated both at subcortical (early GBOs) and cortical levels (late GBOs). The consecutive peaks of GBOs were analysed regarding amplitude and habituation in six successive blocks of 100 averaged pattern reversal (PR)-VEPs in healthy volunteers and interictally in migraine with (MA) or without aura patients. Amplitude of the two early GBO components in the first PR-VEP block was significantly increased in MA patients. There was a significant habituation deficit of the late GBO peaks in migraineurs. The increased amplitude of early GBOs could be related to the increased interictal visual discomfort reported by patients. We hypothesize that the hypo-functioning serotonergic pathways may cause, in line with the thalamocortical dysrhythmia theory, a functional disconnection of the thalamus leading to decreased intracortical lateral inhibition, which can induce dishabituation.

scholarly journals High-threshold Ca2+channels behind gamma band activity in the pedunculopontine nucleus (PPN)

2015 ◽  
Vol 3 (6) ◽  
pp. e12431 ◽  
Author(s):  
Brennon Luster ◽  
Stasia D'Onofrio ◽  
Francisco Urbano ◽  
Edgar Garcia-Rill
Keyword(s):  
Pedunculopontine Nucleus ◽  
Gamma Band ◽  
High Threshold ◽  
Gamma Band Activity ◽  
Ca2 Channels ◽  
Band Activity

scholarly journals Neurophenomenology of Out-of-Body experiences induced by hypnotic suggestions

2018 ◽  
Author(s):  
Enrico Facco ◽  
Edoardo Casiglia ◽  
Benedikt Emanuel Al Khafaji ◽  
Francesco Finatti ◽  
Gian Marco Duma ◽  
...  
Keyword(s):  
Positive Affect ◽  
Multisensory Integration ◽  
Spectral Power ◽  
Gamma Band ◽  
Altered State ◽  
Brain Areas ◽  
Body Experiences ◽  
Gamma Band Activity ◽  
Band Activity ◽  
Hypnotic Suggestions

Inducing out-of-body experiences in hypnosis (H-OBEs) offers an almost unique opportunity to investigate them in a controlled condition.OBEs were induced as imaginative task in resting conditions (I-OBE) or in hypnosis (H-OBE) in 15 high hypnotizable subjects. A 32-channel EEG was recorded and the spectral power and imaginary coherence were calculated. At the end of each session, the Phenomenology of Consciousness Inventory (PCI) was administered to check the phenomenological aspects of their experience.Significantly higher scores in the Altered State, Positive Affect, Altered Experience and Attention subdimensions of the PCI were reported in H-OBE than in I-OBE, which were associated to a significant decrease of power in beta and gamma band activity in right parieto-temporal derivations. Our result suggest that H-OBE may be an appealing model of “true” OBEs, including an alteration of multisensory integration in right parieto-temporal brain areas.

scholarly journals A MACHINE-LEARNING CLASSIFIER FOR EPISODIC MIGRAINE BASED ON VISUAL EVOKED GAMMA BAND ACTIVITY

2016 ◽  
Vol 8 ◽  
Author(s):  
D'Ostilio Kevin ◽  
Lisicki Marco ◽  
Schoenen Jean ◽  
Magis Delphine
Keyword(s):  
Machine Learning ◽  
Episodic Migraine ◽  
Gamma Band ◽  
Learning Classifier ◽  
Gamma Band Activity ◽  
Band Activity ◽  
Visual Evoked

Parietal gamma-band activity during auditory spatial precueing of motor responses

Neuroreport ◽  
2001 ◽  
Vol 12 (16) ◽  
pp. 3479-3482 ◽  
Author(s):  
Jochen Kaiser ◽  
Werner Lutzenberger
Keyword(s):  
Gamma Band ◽  
Motor Responses ◽  
Gamma Band Activity ◽  
Band Activity
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