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Cognitive degradation after exposure to combined noise and whole-body vibration in a simulated vehicle ride
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Occupational and Environmental Medicine.
2007 (English)In: International Journal of Vehicle Noise and Vibration (IJVNV), ISSN 1479-148X, Vol. 3, no 2, 130-142 p.Article in journal (Refereed) Published
Abstract [en]

This study investigated if vehicle noise and whole-body vibrations produce negative after-effects on performance in an attention task and on ratings of alertness, difficulty, and annoyance. The task was applied before and after exposure, and after a rest. Participants had degraded performance immediately after exposure in all conditions, but no effect was found after the rest. No main effect was found between exposure conditions on performance, it was concluded that the degraded performance dependent on time was caused by fatigue. The results also suggested lower ratings of alertness and higher ratings of annoyance in the vibration condition compared to the control condition.

Place, publisher, year, edition, pages
2007. Vol. 3, no 2, 130-142 p.
Keyword [en]
vehicle vibration, vehicle noise, cognitive degradation, after-effects, alertness, annoyance, whole-body vibrations, ride simulation, performance degradation, fatigue
URN: urn:nbn:se:umu:diva-24944DOI: 10.1504/IJVNV.2007.014900OAI: diva2:228111
Available from: 2009-07-24 Created: 2009-07-24 Last updated: 2012-01-24
In thesis
1. Psychological responses to noise and vibration
Open this publication in new window or tab >>Psychological responses to noise and vibration
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Vehicle drivers are a group of workers that are exposed to noise and whole-body vibration (WBV) several hours a day. Some drivers may also be exposed to high mental loads – monitoring and manipulating physical controls while engaging problem solving activities often with strong short-term memory and spatial manipulation components. Present standards and regulations that govern health risk assessment do not take into consideration the complexities of these multiple exposure environments. The effect of one factor (for example, noise or WBV) may be different than the effect of two factors presented together. This thesis investigates whether the combination of noise and WBV affects the performance of cognitive tasks more than when the exposures are presented separately.

A series of studies were designed to expose subjects to noise and WBV stimuli designed to simulate real life working conditions. Different combinations of subjective ratings, cognitive tests, and cortisol measurements were conducted both during and immediately after exposures, which ranged from 20 to 45 minutes.

The studies have shown that a combination of noise and WBV do not degrade cognitive performance more than a single stimulus. However, WBV can degrade attention performance after exposure is turned off when drivers have been working under high mental load during exposure. The combined stimuli are also experienced as more annoying and work is more difficult in such conditions. The exposure times and task difficulty levels used in this thesis did not produce biological stress as measured by cortisol. Nevertheless, subjective ratings are sometimes seen as early indicators of other symptoms and with increased task difficulty and/or longer exposure times there may appear other measurable outcomes of the combined stimuli.

Place, publisher, year, edition, pages
Umeå: Folkhälsa och klinisk medicin, 2006. 52 p.
Umeå University medical dissertations, ISSN 0346-6612 ; 1068
Psychology, Cognitive, Cortisol, Noise, Vibration, Occupational, Vehicle, Weinstein, Occupational, Vehicle, Weinstein, Weinstein, Psykologi
Research subject
urn:nbn:se:umu:diva-915 (URN)91-7264-215-7 (ISBN)
Public defence
2006-11-24, Stora föreläsningssalen, Arbetslivsinstitutet, Johan Bures väg 5, Umeå, 09:00 (English)
Available from: 2006-11-06 Created: 2006-11-06 Last updated: 2009-10-09Bibliographically approved

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