Perceived mental effort correlates with changes in tonic arousal during attentional tasks

 

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dc.contributor.author Howells, Fleur M
dc.contributor.author Stein, Dan J
dc.contributor.author Russell, Vivienne A
dc.date.accessioned 2016-09-27T12:25:03Z
dc.date.available 2016-09-27T12:25:03Z
dc.date.issued 2010
dc.identifier http://dx.doi.org/10.1186/1744-9081-6-39
dc.identifier.citation Howells, F. M., Stein, D. J., & Russell, V. A. (2010). Perceived mental effort correlates with changes in tonic arousal during attentional tasks. Behavioral and Brain Functions, 6(1), 1.
dc.identifier.uri http://hdl.handle.net/11427/21950
dc.description.abstract Background: It has been suggested that perceived mental effort reflects changes in arousal during tasks of attention. Such changes in arousal may be tonic or phasic, and may be mediated by the locus-coeruleus norepinephrine (LC-NE) system. We hypothesized that perceived mental effort during attentional tasks would correlate with tonic changes in cortical arousal, as assessed by relative electroencephalogram (EEG) band power and theta/beta ratio, and not with phasic changes in cortical arousal, assessed by P300 amplitude and latency. Methods: Forty-six healthy individuals completed tasks that engage the anterior and posterior attention networks (continuous performance task, go/no-go task, and cued target detection task). During completion of the three attentional tasks a continuous record of tonic and phasic arousal was taken. Cortical measures of arousal included frequency band power, theta/beta ratios over frontal and parietal cortices, and P300 amplitude and latency over parietal cortices. Peripheral measures of arousal included skin conductance responses, heart rate and heart rate variance. Participants reported their perceived mental effort during each of the three attentional tasks. Results: First, changes in arousal were seen from rest to completion of the three attentional tasks and between the attentional tasks. Changes seen between the attentional tasks being related to the task design and the attentional network activated. Second, perceived mental effort increased when demands of the task increased and correlated with left parietal beta band power during the three tasks of attention. Third, increased mental effort during the go/no-go task and the cued target detection task was inversely related to theta/beta ratios. Conclusion: These results indicate that perceived mental effort reflects tonic rather than phasic changes in arousal during tasks of attention. We suggest that perceived mental effort may reflect in part tonic activity of the LC-NE system in healthy individuals.
dc.source Behavioral And Brain Functions
dc.source.uri https://behavioralandbrainfunctions.biomedcentral.com/
dc.subject.other Behavioral and Cognitive Neuroscience
dc.title Perceived mental effort correlates with changes in tonic arousal during attentional tasks
dc.date.updated 2016-09-27T12:23:39Z
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Health Sciences en_ZA
dc.publisher.department Department of Psychiatry and Mental Health en_ZA
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