An Analysis of EEG and Plethysmogram on Working Environment under Mental Workload

• MIZUNO-MATSUMOTO Yuko

  Graduate School of Applied Informatics, University of Hyogo

• TANAKA Yasuhito

  Graduate School of Applied Informatics, University of Hyogo

• HAYASHI Takuto

  Graduate School of Applied Informatics, University of Hyogo

• OKAMOTO Eika

  Graduate School of Applied Informatics, University of Hyogo

• NISHIMURA Haruhiko

  Graduate School of Applied Informatics, University of Hyogo

• INADA Hiroshi

  Graduate School of Applied Informatics, University of Hyogo

Bibliographic Information

Other Title

• 精神作業負荷時における作業環境と関連した脳波・脈波の定量解析
• セイシン サギョウ フカジ ニ オケル サギョウ カンキョウ ト カンレン シタ ノウハ ミャクハ ノ テイリョウ カイセキ

Abstract

The aim of this research was to assess the physiological signals which were relevant working efficiency under mental workload. Eleven healthy subjects were examined. In the first step, their mood status and stress level were evaluated with questionnaire methods:“Profile of Mood States (POMS)” and “Stress Self Rating Scale (SSRS)”, respectively. In the second step, electroencephalography (EEG) and photoplethysmography under the mental workload tasks in four auditory stimuli (silent circumstance, white noise, classical music, and up-tempo music) were measured. The mental workload tasks consisted of two parts:performing Uchida-Kraepelin test (calculating task:CAL) on PC monitor in two minutes and fixating on a crosshair image (after CAL) in two minutes. A procedure of the mental workload task in each auditory stimulus was repeated three times. EEG data were analyzed using a discrete Fourier transform to obtain power spectral density (PSD) in theta, alpha, and beta bands. Pulse waves from photoplethysmography were analyzed for estimating the pulse wave amplitude (PWA) and length (PWL). PSDs of theta band in silent circumstance and classical music under and after CALs, alpha band in classical music under and after CALs, and beta band in up-tempo music under CAL on most or all areas were significantly larger than those in the other auditory stimuli. The results of photoplethysmography analysis showed that changes of PWA and PWL in silent circumstance and classical music were more stable than those in the other auditory stimuli. It was suggested that the classical music would not only affect brain activity under the mental workload and augment the efficiency of it, but also facilitate recovery of the physiological conditions from the stressful situations. These events from the physiological point of view showed that working environments could be considered to avoid adding stress on the brain function and autonomic nervous system during and even after the tasks.

Journal

• Transactions of Japanese Society for Medical and Biological Engineering

  Transactions of Japanese Society for Medical and Biological Engineering 48 (1), 11-24, 2010

  Japanese Society for Medical and Biological Engineering

Keywords

• EEG
• photoplethysmography
• stress
• auditory stimuli
• calculating task

Details

• CRID: 1390282680244372992
• NII Article ID: 10031199740
• NII Book ID: AA11633569
• DOI: 10.11239/jsmbe.48.11
• ISSN: 18814379
• ISSN: 1347443X
• NDL BIB ID: 10632188
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10632188
• Web Site: https://search.jamas.or.jp/link/ui/2010170932
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed