VIBROTACTILE INTENSITY DISCRIMINATION MEASURED BY 3 METHODS
VIBROTACTILE INTENSITY DISCRIMINATION MEASURED BY 3 METHODS
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DOI：
10.1121/1.399300
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发表时间：
1990-01-01
影响因子：
2.4
通讯作者：
RYAN, TF
中科院分区：
文献类型：
--
作者：
GESCHEIDER, GA;BOLANOWSKI, SJ;RYAN, TF
检测振动幅度变化的差异阈值是通过 2.9 cm2 接触器传递到鱼际隆起的刺激强度和频率的函数来测量的。刺激是 25 或 250 Hz 正弦波、以 250 Hz 为中心的窄带噪声或宽带噪声。阈值是通过三种刺激呈现方法下的两个间隔、强制选择跟踪来测量的。在门控基座方法中，受试者必须判断间隔 1000 毫秒的两次 700 毫秒振动突发中哪一个更强烈。在连续基座方法中，受试者必须检测到持续基座振动幅度的 700 毫秒增量。在具有 1500 毫秒基座的双突发连续基座方法中，受试者必须检测两个连续出现的基座中哪一个包含 500 毫秒的幅度增量。用于检测连续振动基座的振幅增量的阈值始终低于用于检测短暂呈现的连续基座之间的振幅差或连续基座中的振幅增量的阈值。对于正弦曲线和噪声刺激，我们都发现了韦伯定律的“险些失误”。差异阈值不受刺激频率条件的影响。
The difference threshold for the detection of changes in vibration amplitude was measured as a function of the intensity and frequency of stimuli delivered through a 2.9-cm2 contactor to the thenar eminence. Stimuli were either 25- or 250-Hz sinusoids, narrow-band noise centered at 250 Hz, or wideband noise. Thresholds were measured by two-interval, forced-choice tracking under three methods of stimulus presentation. In the gated-pedestal method, subjects had to judge which of two 700-ms bursts of vibration separated by 1000 ms was more intense. In the continuous-pedestal method, subjects had to detect a 700-ms increment in the amplitude of an ongoing pedestal of vibration. In the two-burst-continuous-pedestal method with 1500-ms pedestals, the subject had to detect which of two successively presented pedestals contained a 500-ms amplitude increment. Thresholds were consistently lower for detecting increments in the amplitude of a continuous pedestal of vibration than for detecting amplitude differences between briefy presented successive pedestals or amplitude increments in successive pedestals. A "near miss" to Weber''s law was found both for sinusoidal and for noise stimuli. The difference threshold was not affected by stimulus frequency condition.