scholarly journals Communication call-evoked gamma-band activity in the auditory cortex of awake bats is modified by complex acoustic features

2008 ◽  
Vol 1188 ◽  
pp. 76-86 ◽  
Author(s):  
Andrei V. Medvedev ◽  
Jagmeet S. Kanwal
Keyword(s):  
Auditory Cortex ◽  
Gamma Band ◽  
Acoustic Features ◽  
Gamma Band Activity ◽  
Band Activity

Thalamocortical inputs trigger a propagating envelope of gamma-band activity in auditory cortex in vitro

1999 ◽  
Vol 126 (2) ◽  
pp. 160-174 ◽  
Author(s):  
R. Metherate ◽  
Scott J. Cruikshank
Keyword(s):  
Auditory Cortex ◽  
Gamma Band ◽  
Gamma Band Activity ◽  
Band Activity

scholarly journals Aberrant thalamocortical coherence in an animal model of tinnitus

2019 ◽  
Vol 121 (3) ◽  
pp. 893-907
Author(s):  
Paulo Vianney-Rodrigues ◽  
Benjamin D. Auerbach ◽  
Richard Salvi
Keyword(s):  
Auditory Cortex ◽  
Gamma Oscillations ◽  
Gamma Band ◽  
Oscillatory Activity ◽  
Alpha Power ◽  
Drug Induced ◽  
Medial Geniculate ◽  
Thalamocortical Oscillations ◽  
Gamma Band Activity ◽  
Band Activity

Electrophysiological and imaging studies from humans suggest that the phantom sound of tinnitus is associated with abnormal thalamocortical neural oscillations (dysrhythmia) and enhanced gamma band activity in the auditory cortex. However, these models have seldom been tested in animal models where it is possible to simultaneously assess the neural oscillatory activity within and between the thalamus and auditory cortex. To explore this issue, we used multichannel electrodes to examine the oscillatory behavior of local field potentials recorded in the rat medial geniculate body (MBG) and primary auditory cortex (A1) before and after administering a dose of sodium salicylate (SS) that reliably induces tinnitus. In the MGB, SS reduced theta, alpha, and beta oscillations and decreased coherence (synchrony) between electrode pairs in theta, alpha, and beta bands but increased coherence in the gamma band. Within A1, SS significantly increased gamma oscillations, decreased theta power, and decreased coherence between electrode pairs in theta and alpha bands but increased coherence in the gamma band. When coherence was measured between one electrode in the MGB and another in A1, SS decreased coherence in beta, alpha, and theta bands but increased coherence in the gamma band. SS also increased cross-frequency coupling between the phase of theta oscillations in the MGB and amplitude of gamma oscillations in A1. Altogether, our results suggest that SS treatment fundamentally alters the manner in which thalamocortical circuits communicate, leading to excessive cortical gamma power and synchronization, neurophysiological changes implicated in tinnitus. Our data provide support for elements of both the thalamocortical dysrhythmia (TD) and synchronization by loss of inhibition (SLIM) models of tinnitus, demonstrating that increased cortical gamma band activity is associated with both enhanced theta-gamma coupling as well as decreases alpha power/coherence between the MGB and A1. NEW & NOTEWORTHY There are no effective drugs to alleviate the phantom sound of tinnitus because the physiological mechanisms leading to its generation are poorly understood. Neural models of tinnitus suggest that it arises from abnormal thalamocortical oscillations, but these models have not been extensively tested. This article identifies abnormal thalamocortical oscillations in a drug-induced tinnitus model. Our findings open up new avenues of research to investigate whether cellular mechanisms underlying thalamocortical oscillations are causally linked to tinnitus.

scholarly journals Spontaneous High-Gamma Band Activity Reflects Functional Organization of Auditory Cortex in the Awake Macaque

Neuron ◽  
2012 ◽  
Vol 74 (5) ◽  
pp. 899-910 ◽  
Author(s):  
Makoto Fukushima ◽  
Richard C. Saunders ◽  
David A. Leopold ◽  
Mortimer Mishkin ◽  
Bruno B. Averbeck
Keyword(s):  
Auditory Cortex ◽  
Functional Organization ◽  
Gamma Band ◽  
High Gamma ◽  
Gamma Band Activity ◽  
Band Activity

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
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