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Top-down attentional processing enhances auditory evoked gamma band activity

Top-down attentional processing enhances auditory evoked gamma band activity
Top-down attentional processing enhances auditory evoked gamma band activity
In contrast to animal studies, relatively little is known about the functional significance of the early evoked gamma band activity in humans. We investigated whether evoked and induced 40 Hz activity differentiate automatic, bottom-up aspects of attention from voluntary, top-down related attentional demands. An auditory novelty-oddball task was applied to 14 healthy subjects. As predicted, more evoked gamma was found for the target condition than in the two task-irrelevant conditions. Since gamma band activity was not enhanced for novel stimuli, the evoked gamma response cannot be explained with a simple concept of stimulus arousal. Neither induced gamma nor the degree of 40 Hz phase-locking were different between the experimental conditions. Taken together, our data emphasize the role of evoked gamma band activity for top-down attentional processing.
683-686
Debener, Stefan
e6bf9143-09a8-45c0-8536-3564885375d4
Herrmann, Christoph S.
e3edc057-1857-4a1e-81f9-dc2dbd279cf7
Kranczioch, Cornelia
c5d9d3fb-2b54-4ae0-85dd-fb1ae11aea4f
Gembris, Daniel
52c6d6f0-31ff-4a39-8042-1e04d89dc974
Engel, Andreas K.
4c9e2742-c147-46d6-b750-bcab4b5baf34
Debener, Stefan
e6bf9143-09a8-45c0-8536-3564885375d4
Herrmann, Christoph S.
e3edc057-1857-4a1e-81f9-dc2dbd279cf7
Kranczioch, Cornelia
c5d9d3fb-2b54-4ae0-85dd-fb1ae11aea4f
Gembris, Daniel
52c6d6f0-31ff-4a39-8042-1e04d89dc974
Engel, Andreas K.
4c9e2742-c147-46d6-b750-bcab4b5baf34

Debener, Stefan, Herrmann, Christoph S., Kranczioch, Cornelia, Gembris, Daniel and Engel, Andreas K. (2003) Top-down attentional processing enhances auditory evoked gamma band activity. Neuroreport, 14 (5), 683-686.

Record type: Article

Abstract

In contrast to animal studies, relatively little is known about the functional significance of the early evoked gamma band activity in humans. We investigated whether evoked and induced 40 Hz activity differentiate automatic, bottom-up aspects of attention from voluntary, top-down related attentional demands. An auditory novelty-oddball task was applied to 14 healthy subjects. As predicted, more evoked gamma was found for the target condition than in the two task-irrelevant conditions. Since gamma band activity was not enhanced for novel stimuli, the evoked gamma response cannot be explained with a simple concept of stimulus arousal. Neither induced gamma nor the degree of 40 Hz phase-locking were different between the experimental conditions. Taken together, our data emphasize the role of evoked gamma band activity for top-down attentional processing.

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Published date: 2003

Identifiers

Local EPrints ID: 27562
URI: https://eprints.soton.ac.uk/id/eprint/27562
PURE UUID: f81ff7cf-0f8d-4cf0-b79f-e00a302931a1

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Date deposited: 28 Apr 2006
Last modified: 17 Jul 2017 16:04

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