Abstract
To study the possible interference of low frequency noise on performance
and annoyance, subjects categorised as having a high- or low sensitivity
to noise in general and low frequency noise in particular worked
with different performance tasks in a noise environment with predominantly
low frequency content or flat frequency content (reference noise),
both at a level of 40 dBA. The effects were evaluated in terms of
changes in performance and subjective reactions. The results showed
that there was a larger improvement of response time over time, during
work with a verbal grammatical reasoning task in the reference noise,
as compared to the low frequency noise condition. The results further
indicated that low frequency noise interfered with a proof-reading
task by lowering the number of marks made per line read. The subjects
reported a higher degree of annoyance and impaired working capacity
when working under conditions of low frequency noise. The effects
were more pronounced for subjects rated as high-sensitive to low
frequency noise, while partly different results were obtained for
subjects rated as high-sensitive to noise in general. The results
suggest that the quality of work performance and perceived annoyance
may be influenced by a continuous exposure to low frequency noise
at commonly occurring noise levels. Subjects categorised as high-sensitive
to low frequency noise may be at highest risk.
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