Abstract:
Recently,
improvement of memory ability by listening noise in deep sleep has
attracted extensive attention for its promising potential to prevent
older adults from degrading cognitive function such as mild cognitive
impairment and dementia. In particular, pink noise with
1/f-characteristics was frequently used to facilitate synchronization of
neural oscillatory activities. However, the effect of pink noise on
short-term memory task including memory encoding and recall during awake
state has not been well investigated. We conducted a simple memory task
consisting of memorization of ten fish names during which pink noise
was presented and recalling them before and after mental arithmetic for
seven healthy young males. Memory recall performance and amplitudes of
electroencephalogram (EEG) for noise-added trials were compared with
those for control trials without additive noise. The beta and gamma wave
amplitudes in the noise-added trials for participants with higher
memory performance in the noise-added trials than the control trials
were larger than the amplitudes in the control trials by about 10
points, whereas the former amplitudes for participants with lower memory
performance in the noise-added trials were smaller than the latter
amplitudes. There is a possibility that pink noise could affect the
memory ability through the enhancement of beta and gamma wave.
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