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Induced activity in EEG in response to auditory stimulation

Induced activity in EEG in response to auditory stimulation
Induced activity in EEG in response to auditory stimulation
The response of the brain to a sensory stimulus may present itself in the electroencephalogram (EEG) as evoked and/or induced activity. While the evoked response is given by peaks and troughs in the signal, time-locked and phase-locked to the stimuli, the induced response is time- but not phase-locked, and can be considered as an increase or a decrease in the power of EEG in a specific frequency band at a specific time range with regard to the stimulus onset. The induced response does not have the same phase following successive stimuli. It is believed that cognition and perception of a stimulus present themselves primarily as the induced response in the EEG. In this paper, the induced response of the brain to auditory speech stimuli is investigated and different approaches to detect induced activity are compared. It is shown that there is an increase in theta and delta power in response to words compared to the baseline, starting around 500 ms after their onset. During this time, there is also an increase in pairwise coherence between the posterior electrodes. In response to tone bursts, a change in pairwise coherence was observed in the beta band starting around 200 ms. To the best of our knowledge, this is the first time such responses have been described using simple protocols without complex stimulus manipulations being involved. Responses in the EEG to speech rather than the more conventional tone-bursts or clicks suggests that it may be feasible to use the EEG as an objective means to demonstrate brain activation to salient real world stimuli. This would be of particular benefit in investigating access to speech in patients who are unable or unwilling to reliably respond to conventional subjective experimental protocols, such as infants
induced response, evoked response, eeg, pairwise coherence, auditory stimuli
1746-8094
31-43
Hosseini, Pegah Tayaranian
47511a4b-5adc-4e93-9d2a-46e3016c87fb
Bell, Steven
91de0801-d2b7-44ba-8e8e-523e672aed8a
Wang, Shouyan
fa12f1bf-cac9-4118-abdd-9d52f235b05c
Simpson, David
53674880-f381-4cc9-8505-6a97eeac3c2a
Hosseini, Pegah Tayaranian
47511a4b-5adc-4e93-9d2a-46e3016c87fb
Bell, Steven
91de0801-d2b7-44ba-8e8e-523e672aed8a
Wang, Shouyan
fa12f1bf-cac9-4118-abdd-9d52f235b05c
Simpson, David
53674880-f381-4cc9-8505-6a97eeac3c2a

Hosseini, Pegah Tayaranian, Bell, Steven, Wang, Shouyan and Simpson, David (2015) Induced activity in EEG in response to auditory stimulation. Biomedical Signal Processing and Control, 22, 31-43. (doi:10.1016/j.bspc.2015.06.005).

Record type: Article

Abstract

The response of the brain to a sensory stimulus may present itself in the electroencephalogram (EEG) as evoked and/or induced activity. While the evoked response is given by peaks and troughs in the signal, time-locked and phase-locked to the stimuli, the induced response is time- but not phase-locked, and can be considered as an increase or a decrease in the power of EEG in a specific frequency band at a specific time range with regard to the stimulus onset. The induced response does not have the same phase following successive stimuli. It is believed that cognition and perception of a stimulus present themselves primarily as the induced response in the EEG. In this paper, the induced response of the brain to auditory speech stimuli is investigated and different approaches to detect induced activity are compared. It is shown that there is an increase in theta and delta power in response to words compared to the baseline, starting around 500 ms after their onset. During this time, there is also an increase in pairwise coherence between the posterior electrodes. In response to tone bursts, a change in pairwise coherence was observed in the beta band starting around 200 ms. To the best of our knowledge, this is the first time such responses have been described using simple protocols without complex stimulus manipulations being involved. Responses in the EEG to speech rather than the more conventional tone-bursts or clicks suggests that it may be feasible to use the EEG as an objective means to demonstrate brain activation to salient real world stimuli. This would be of particular benefit in investigating access to speech in patients who are unable or unwilling to reliably respond to conventional subjective experimental protocols, such as infants

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More information

Accepted/In Press date: 1 June 2015
e-pub ahead of print date: 10 July 2015
Published date: September 2015
Keywords: induced response, evoked response, eeg, pairwise coherence, auditory stimuli
Organisations: Inst. Sound & Vibration Research

Identifiers

Local EPrints ID: 379560
URI: http://eprints.soton.ac.uk/id/eprint/379560
ISSN: 1746-8094
PURE UUID: f0e83455-3ebd-452a-9396-1c7d0cbdf29c
ORCID for David Simpson: ORCID iD orcid.org/0000-0001-9072-5088

Catalogue record

Date deposited: 23 Jul 2015 12:51
Last modified: 15 Mar 2024 03:14

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Contributors

Author: Pegah Tayaranian Hosseini
Author: Steven Bell
Author: Shouyan Wang
Author: David Simpson ORCID iD

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