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Investigating evoked and induced electroencephalogram activity in task-related alpha power increases during an internally directed attention task

Cooper, NR and Burgess, AP and Croft, RJ and Gruzelier, JH (2006) 'Investigating evoked and induced electroencephalogram activity in task-related alpha power increases during an internally directed attention task.' NeuroReport, 17 (2). 205 - 208. ISSN 0959-4965

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Abstract

This study sought to explore whether the so-called 'paradoxical' task-related increases in the α bandwidth of the human electroencephalogram result from increases in evoked (phase locked), as opposed to induced (non-phase locked), activity. The electroencephalograms of 18 participants were recorded while they engaged in both auditory sensory-intake tasks (listening to randomly generated 'tunes') and internally directed attention tasks (imagining the same randomly generated tunes) matched for auditory input. Measures of evoked (phase locked) and induced (non-phase locked) activity were compared between tasks. Increases in induced ot power were found during internal attention. No experimental effects were observed for evoked activity. These results are not entirely consistent with proposals that 'paradoxical' α indexes the evoked inhibition of task irrelevant processing. © 2006 Lippincott Williams & Wilkins.

Item Type: Article
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculty of Science and Health > Psychology, Department of
Depositing User: Users 161 not found.
Date Deposited: 29 Jan 2015 13:33
Last Modified: 17 Aug 2017 17:41
URI: http://repository.essex.ac.uk/id/eprint/12444

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