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Titolo:
Evaluation of cognitive performance in the heat by functional brain imaging and psychometric testing
Autore:
Hocking, C; Silberstein, RB; Lau, WM; Stough, C; Roberts, W;
Indirizzi:
Dept Def Commonwealth Australia, DSTO, Combatant Protect & Nutr Branch, Melbourne, Vic 3001, Australia Dept Def Commonwealth Australia Melbourne VicAustralia 3001 1, Australia Swinburne Univ Technol, Brain Sci Inst, Hawthorn, Vic 3122, Australia Swinburne Univ Technol Hawthorn Vic Australia 3122 n, Vic 3122, Australia
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR AND INTEGRATIVE PHYSIOLOGY
fascicolo: 4, volume: 128, anno: 2001,
pagine: 719 - 734
SICI:
1095-6433(200104)128:4<719:EOCPIT>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRESS;
Keywords:
thermal strain; military operations in the heat; functional brain imaging; Steady-State Visual Evoked Potential; Steady State Probe Topography (SSPT); brain electrical activities; psychometric testing; cognitive performance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Lau, WM Dept Def Commonwealth Australia, DSTO, Combatant Protect & Nutr Branch, POB 4331, Melbourne, Vic 3001, Australia Dept Def Commonwealth Australia POB 4331 Melbourne Vic Australia 3001
Citazione:
C. Hocking et al., "Evaluation of cognitive performance in the heat by functional brain imaging and psychometric testing", COMP BIOC A, 128(4), 2001, pp. 719-734

Abstract

Military operations in tropical environments have imposed a significant challenge to the Australian Defence Forces (ADF). The hot and humid conditions are known to cause debilitating effects on soldiers deployed to northern regions of Australia, with the consequence that the effectiveness and efficiency of operations are severely compromised. While the adverse effects of thermal stress on soldiers' physiological capability are well established, this has not been confirmed for cognitive performance. A select range of psychometric tests were administered and functional brain electrical activityimaging was performed to investigate the impact of thermal stress on cognitive performance. The brain electrical activity of subjects was measured while undertaking a range of cognitive tasks. Steady State Probe Topography (SSPT), a novel brain imaging technology, was employed to monitor the changes in regional brain activity and neural processing speed of subjects under thermal stress. The psychometric test batteries included the following tasks; Rey Auditory Verbal Learning Test; Inspection Time; Digit Span test; a spatial working memory task; and the AX-continuous performance task. These tasks measure a range of cognitive processes including attention, memory, verbal learning, information processing and concentration. The functional brain imaging provided topographical information, which showed changes in electrical activity in response to thermal stress during cognitive performance. These changes in brain electrical activity and neural speed induced by thermal stress may help to identify the type of cognitive functions that are likely to be impaired under operational conditions. Results indicated that subjects experienced increasing cardiovascular strain through thermally neutral to thermally straining conditions. The results from the psychometric test battery showed some promising effects given the small sample size including deficits in working memory, in information retention and in informationprocessing. There was also marked differences in the electrical responses of the brain when subjects were thermally strained. The Steady-State VisualEvoked Potential recordings showed an increase in amplitude and a decreasein latency, suggesting an increase in the utilisation of neural resources or effort by subjects to maintain the same level of performance as under thermally neutral conditions. The data are suggestive of the high sensitivityof brain imaging techniques with high temporal resolution to identify important decrements in cognitive performance in hostile environments. (C) 2001Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 06:37:12