Generators of the intracranial P50 response in auditory sensory gating

Clarification of the cortical mechanisms underlying auditory sensory gating may advance our understanding of brain dysfunctions associated with schizophrenia. To this end, data from nine epilepsy patients who participated in an auditory paired-click paradigm during pre-surgical evaluation and had gr...

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Bibliographic Details
Published in:NeuroImage (Orlando, Fla.) Fla.), 2007-04, Vol.35 (2), p.814-826
Main Authors: Korzyukov, Oleg, Pflieger, Mark E., Wagner, Michael, Bowyer, Susan M., Rosburg, T., Sundaresan, Karthik, Elger, Christian Erich, Boutros, Nashaat N.
Format: Article
Language:English
Subjects:
Adult
Auditory EP
Brain
Electrophysiology
Evoked Potentials, Auditory - physiology
Female
Frontal Lobe - physiology
Gating
Humans
Male
Neuronal generators
P50 response
Schizophrenia
Studies
Temporal Lobe - physiology
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Summary:Clarification of the cortical mechanisms underlying auditory sensory gating may advance our understanding of brain dysfunctions associated with schizophrenia. To this end, data from nine epilepsy patients who participated in an auditory paired-click paradigm during pre-surgical evaluation and had grids of electrodes covering temporal and frontal lobe were analyzed. A distributed source localization approach was applied to the intracranial P50 response and the Gating Difference Wave obtained by subtracting the response to the second stimuli from the response to the first stimuli. Source reconstruction of the P50 showed that the main generators of the response were localized in the temporal lobes. The analysis also suggested that the maximum neuronal activity contributing to the amplitude reduction in the P50 time range (phenomenon of auditory sensory gating) is localized at the frontal lobe. Present findings suggest that while the temporal lobe is the main generator of the P50 component, the frontal lobe seems to be a substantial contributor to the process of sensory gating as observed from scalp recordings.
ISSN:1053-8119
1095-9572
DOI:10.1016/j.neuroimage.2006.12.011