Abstract
This paper describes the effects of meaningful and meaningless external
acoustical noise, at various sound pressure level values, on participants
during a mental task. That is, the authors focused on the psychological
impression of ‘annoyance' caused by noise, and ‘performance' indicated
by factors such as percentage of correct answers and reaction time.
More specifically, the authors discussed how these two items depend
on the sound pressure level value of noise, and how they change due
to meaningful or meaningless noise. Moreover, the difference between
subjective feelings of ‘fatigue' before and after the task, both
with and without noise was considered. Furthermore, an investigation
was made into how the above items change in the case of aural or
visual task presentations. The task was the probe digit, which is
a short-term memory task. As a result, the importance of reducing
meaningful external noise at low sound pressure level values was
shown.
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