Makous J C, Gescheider G A, Bolanowski S J
Institute for Sensory Research, Syracuse University, new York 13244-5290, USA.
J Acoust Soc Am. 1996 Feb;99(2):1124-9. doi: 10.1121/1.414597.
Vibrotactile forward masking experiments were conducted on the thenar eminence of the hand to determine the time course of masking in the Pacinian (P) or a non-Pacinian (NP I) channel. Brief masking and test stimuli that contained energy centered either below 27 or at 500 Hz were used to preferentially activate the NP I or P channels, respectively. Test thresholds were measured at different fixed delays ( Delta t) between the masking and test stimuli that ranged from 5 to 995 microseconds. Masking stimulus level was also varied from 5 to 25 dB above threshold. The masking effect followed an exponential decay with different time constants for each of the channels, but a similar asymptote (residual masking) for both channels. At the higher masking stimulus levels, the time constant for the P channel was about 40 microseconds, while the time constant for the NP I channel was about 100 microseconds. Residual masking in both channels increased about 1 dB for every 5-dB increase of masking stimulus level.
在手的鱼际肌进行了振动触觉前掩蔽实验，以确定帕西尼氏（P）或非帕西尼氏（NP I）通道中掩蔽的时间进程。分别使用包含以27Hz以下或500Hz为中心能量的短暂掩蔽和测试刺激，优先激活NP I或P通道。在掩蔽和测试刺激之间不同的固定延迟（Δt）下测量测试阈值，延迟范围为5至995微秒。掩蔽刺激水平也在高于阈值5至25dB之间变化。每个通道的掩蔽效应均遵循指数衰减，但具有不同的时间常数，而两个通道的渐近线（残余掩蔽）相似。在较高的掩蔽刺激水平下，P通道的时间常数约为40微秒，而NP I通道的时间常数约为100微秒。掩蔽刺激水平每增加5dB，两个通道中的残余掩蔽增加约1dB。
