Cooper, Nicholas R.; Burgess, Adrian P.; Croft, Rodney J. and Gruzelier, John. 2006. Investigating evoked and induced electroencephalogram activity in task-related alpha power increases during an internally directed attention task. NeuroReport, 17(2), pp. 205-208. ISSN 0959-4965 [Article]

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Abstract or Description

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 α 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.

Item Type:	Article
Departments, Centres and Research Units:	Psychology
Dates:	Date Event 2006 Published
Item ID:	5288
Date Deposited:	16 Mar 2011 14:32
Last Modified:	30 Jun 2017 15:27
Peer Reviewed:	Yes, this version has been peer-reviewed.
URI:	https://research.gold.ac.uk/id/eprint/5288

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