刺激音の立ち上がりの変化が聴覚誘発脳磁界N1mに及ぼす影響の検討

抄録

Although several studies have reported that the rise-time of sound stimulus affects on auditory evoked magnetic fields, effects of each parameter which vary in connection with rise-time—whole energy, rising-speed (dL/dt), spectrum—have not been clarified. In this study, N1m amplitudes and latencies were examined using noise-bursts with varying rise-time and constant energy or rising-speed. The results showed that N1m increased in amplitude and decreased in latency as rise-time increased (i.e, energy increased) under the rising-speed-constant condition. In contrast, N1m amplitudes and latencies did not vary significantly as rise-time increased (i.e., rising-speed decreased) under the energy-constant condition. These results indicate that sound energy has greater effects on N1m amplitude and latency than rising-speed.