| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
The sound with a quick attack followed by a slow decay is called damped sound, while the time-reversed sound is called ramped sound. Psychophysical experiments have shown that this asymmetry influence sound perception. Previously,we found the longer perception in ramped sounds caused mainly from edge cells in the primary auditory cortex (A1). However, the coding mechanism for temporally asymmetric sounds may not be accomplished at the level of A1. In the present study we recorded single unit activities from higher auditory cortices such as the secondary auditory cortex (A2) and posterior auditory fields (PAF) and examined response patterns during damped and ramped sounds. We found that most of neurons in A2 and PAF responded to ramped or/and damped sound and about 40% of the neurons showed the sensitivities to direction of the amplitude change. These neurons might play an important role in the perception of temporally asymmetric sounds.
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