Bibikov N G
N.N. Andreyev Acoustics Institute, Schwernik st. 4, Moscow 117036, Russia.
Hear Res. 2002 Nov;173(1-2):21-8. doi: 10.1016/s0378-5955(02)00456-2.
The ability of 109 single units in the midbrain acoustic centre of frogs (Rana ridibunda, Rana temporaria) to reproduce 10%, 20 Hz sinusoidal amplitude modulation of a long-duration characteristic frequency tone was studied. The sinusoidal modulation was presented either in isolation or summed with a low-frequency (0-50 Hz) noise. Recordings were obtained in the adapted state. The magnitude of the 20 Hz periodic response component was estimated by means of the synchronisation coefficient and the amplitude of the sine modulation of the instantaneous spike rate. In many units, addition of noise modulation produced considerable enhancement of both the mean discharge rate and the discharge rate synchronised to the 20 Hz amplitude modulation. This enhancement phenomenon is interpreted in the context of stochastic resonance theory.
研究了青蛙（食用蛙、林蛙）中脑听觉中枢109个单个神经元对持续时间长的特征频率音调进行10%、20Hz正弦调幅的再现能力。正弦调制单独呈现或与低频（0 - 50Hz）噪声叠加。在适应状态下进行记录。通过同步系数和瞬时放电率的正弦调制幅度来估计20Hz周期性反应成分的大小。在许多神经元中，添加噪声调制会使平均放电率和与20Hz调幅同步的放电率都显著增强。这种增强现象在随机共振理论的背景下进行了解释。
