| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Outline of Final Research Achievements |
Auditory steady-state response (ASSR) is a frequency-specific response. It is used to objectively evaluate the hearing level in sleeping young infants. To investigate the influence of sleep stage on ASSR, we measured the thresholds of ASSR and recorded electroencephalographic data to determine the sleep stage simultaneously. The thresholds of ASSR were especially lower in stage N3 (deep sleep) and REM (rapid eye movement sleep) Hence, sleep stage should be taken into account when estimating the hearing level from ASSR. Simultaneous measurements of ASSR and sleep stage are very difficult and complicated using commercially available equipment. Thus we are developing the new system to measure both of ASSR and sleep stage and to estimate the hearing level form ASSR thresholds with revision by sleep stage.
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