A Fundamental Research of Evaluating Noise environments in Rooms in View of Mental Disturbance

Research Project

Project/Area Number	59550393
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	建築環境・環境工学
Research Institution	The Institute of Public Health
Principal Investigator	YOSHIDA Takumasa Section Director of Environmental Hygiene, Department of Architectural Hygiene Engineering and Housing, その他, その他 (70077204)
Project Period (FY)	1984 – 1986
Project Status	Completed (Fiscal Year 1986)
Budget Amount *help	¥2,100,000 (Direct Cost: ¥2,100,000) Fiscal Year 1986: ¥300,000 (Direct Cost: ¥300,000) Fiscal Year 1985: ¥300,000 (Direct Cost: ¥300,000) Fiscal Year 1984: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywords	Noise / Mental Disturbance / Performance / 性格
Research Abstract	This study relates to evaluating noise environments of rooms in view of mental disturbance by noise. Mental disturbance was estimated by effects of noise on performance and subjective disturbance by noise in relation to personality of subjects. Choice reaction time and mental calculation were selected as tasks for evaluating effects of noise on performance. Effects of steady pink noise, randomly intermittent pink noise,road traffic noise,railway noise, speech,music and noise of air conditioning were examined on performance and subjective disturbance at levels from 40 to 80 dB(A),Leq(10 min.). It was found that performance type in time series was different between steady pink noise and randomly intermittent pink noise,but that total performance was not different.It was also found that performance subtracted in pink noise above the level of 50 dB(A). Subjective disturbance was indicated larger in intermittent noise than in steady noise at the same level of noise. Secondly,it was found that subjective disturbance was most above the levels of 50 dB(A),Leq in steady pink noise and was least in traffic noise. Performance showed two types in relation to noise levels. First type was that performance was subtracted in the middle levels of noise and the second type was that performance was promoted in the middle levels of noise. Music and speech attenuated in high range of frequency and steady pink noise showed the typical effects on performance in the first type, and railway noise and music not attenuated in high range of frequency showed the typical effects on performance in the second type. Thirdly,it was found that subjects in high introversion or high neuroticism tended to show less performance and larger disturbance.