The 40-Hz auditory steady-state response: a selective biomarker for cortical NMDA function

When subjected to a phasic input, sensory cortical neurons display a remarkable ability to entrain faithfully to the driving stimuli. The entrainment to rhythmic sound stimuli is often referred to as the auditory steady‐state response (ASSR) and can be captured using noninvasive techniques, such as...

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Published in:Annals of the New York Academy of Sciences 2015-05, Vol.1344 (1), p.27-36
Main Author: Sivarao, Digavalli V.
Format: Article
Language:English
Subjects:
40-Hz ASSR
Animals
biomarker
Biomarkers - metabolism
Cerebral Cortex - metabolism
Cerebral Cortex - physiopathology
EEG
Electroencephalography
Evoked Potentials, Auditory
Hallucinations - metabolism
Hallucinations - physiopathology
Humans
N-Methylaspartate - metabolism
NMDA
Schizophrenia
Schizophrenia - metabolism
Schizophrenia - physiopathology
Synaptic Transmission
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description When subjected to a phasic input, sensory cortical neurons display a remarkable ability to entrain faithfully to the driving stimuli. The entrainment to rhythmic sound stimuli is often referred to as the auditory steady‐state response (ASSR) and can be captured using noninvasive techniques, such as scalp‐recorded electroencephalography (EEG). An ASSR to a driving frequency of approximately 40 Hz is particularly interesting in that it shows, in relative terms, maximal power, synchrony, and synaptic activity. Moreover, the 40‐Hz ASSR has been consistently found to be abnormal in schizophrenia patients across multiple studies. The nature of the reported abnormality has been less consistent; while most studies report a deficit in entrainment, several studies have reported increased signal power, particularly when there are concurrent positive symptoms, such as auditory hallucinations. However, the neuropharmacological basis for the 40‐Hz ASSR, as well as its dysfunction in schizophrenia, has been unclear until recently. On the basis of several recent reports, it is argued that the 40‐Hz ASSR represents a specific marker for cortical NMDA transmission. If confirmed, the 40‐Hz ASSR may be a simple and easy‐to‐access pharmacodynamic biomarker for testing the integrity of cortical NMDA neurotransmission that is robustly translational across species.
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source Wiley-Blackwell Journals
subjects 40-Hz ASSR
Animals
biomarker
Biomarkers - metabolism
Cerebral Cortex - metabolism
Cerebral Cortex - physiopathology
EEG
Electroencephalography
Evoked Potentials, Auditory
Hallucinations - metabolism
Hallucinations - physiopathology
Humans
N-Methylaspartate - metabolism
NMDA
Schizophrenia
Schizophrenia - metabolism
Schizophrenia - physiopathology
Synaptic Transmission
title The 40-Hz auditory steady-state response: a selective biomarker for cortical NMDA function
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