| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Outline of Final Research Achievements |
In many acoustic circumstances, waveform of speech and musical sound are asymmetric in time. The sound envelopes play an important role in such sound perceptions. However, little is known about the neural activities in auditory cortex during asymmetrical stimuli. To examine neural mechanisms related to the perceptual asymmetry, we examined response patterns of the auditory cortex neurons during ramped and damped stimuli in awake animals. We found two types of neurons in the primary auditory cortex (A1): edge cells sensitive to the quick attack and quick decay, while slope cells sensitive to the slow attack and slow decay. The majority of A1 neurons are tuned to the velocity (slow or quick). Persistence of excitation after ramped sounds is longer than that after damped sounds caused mainly from edge cells. This physiologically supports psychological reports that persistence of perception is longer after ramped sounds than damped sounds.
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