TEMPERATURE AND CRITERION EFFECTS IN A SOMATOSENSORY SUBSYSTEM - A NEUROPHYSIOLOGICAL AND PSYCHOPHYSICAL STUDY
TEMPERATURE AND CRITERION EFFECTS IN A SOMATOSENSORY SUBSYSTEM - A NEUROPHYSIOLOGICAL AND PSYCHOPHYSICAL STUDY
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DOI：
10.1152/jn.1982.48.3.836
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发表时间：
1982-01-01
影响因子：
2.5
通讯作者：
VERRILLO, RT
中科院分区：
文献类型：
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作者：
BOLANOWSKI, SJ;VERRILLO, RT
在不同皮肤表面温度下，对7名人体观察者进行了振动触觉体感系统的心理物理阈值-频率特征分析。在非受控温度条件下，低灵敏度的低频（10-40 Hz）部分（NP分量）和高灵敏度的u型高频（40-800 Hz）部分（P分量）可见。最大灵敏度点或最佳频率（BF）可以在150-300 Hz之间变化。由于帕西尼亚小体群被认为介导心理物理频率特征的P分量，因此也进行了平行实验，旨在确定温度对猫肠系膜分离的帕西尼亚小体的影响。心理物理结果表明，P分量沿位移连续线向下移动，表明灵敏度在15-20度之间增加。C. BF大致保持不变。对于温度的进一步升高，灵敏度继续增加的趋势，但此外，发现BF沿频率轴向更高的频率移动。心理生理曲线的NP分量在温度介于25-40度之间时保持不变。C，但随着温度下降25度。C该分量获得负斜率，并且发现灵敏度总体下降。对47个处于不同温度下的太平洋小体进行了强度和频率特性的研究。在给定的反应标准下，强度特征将刺激幅度与神经放电率联系起来，频率特征将刺激频率与刺激幅度联系起来。两个响应标准被用来产生频率特征，1尖峰/秒和1尖峰/刺激周期。对于两种响应准则，u型太平洋小体频率特性的BF与温度在21 ~ 41度范围内呈对数相关。C.温度在21-29度之间。C时，感受器的灵敏度随温度降低。温度在29-41度之间变化不大。C.神经生理学测量的强度特征显示，根据制备的温度，高原的位置、长度和位置会发生变化。心理物理和神经生理数据基本一致，结果进一步支持心理物理频率特征的u形部分是由太平洋小体系统介导的理论。心理生理功能的P分量与1尖峰/刺激周期的太平洋小体频率特征相关性最好。得到的心理物理测量BF的大范围可能是由实验期间不受控制的温度条件造成的。
Psychophysical threshold-frequency characteristics for the vibrotactile somatosensory system were obtained on 7 human observers at various skin-surface temperatures. Under uncontrolled temperature conditions, a low-frequency (10-40 Hz) portion (NP component) of low sensitivity and a U-shaped high-frequency (40-800 Hz) portion (P component) of high sensitivity are seen. The point of maximum sensitivity or best frequency (BF) can vary between 150-300 Hz. Since the Pacinian corpuscle population is believed to mediate the P component of the psychophysical frequency characteristic, parallel experiments designed to ascertain the effects of temperature on isolated Pacinian corpuscles from cat mesentery were also performed. The psychophysical results show that the P component shifts downward along the displacement continuum, indicating that there is an increase in sensitivity between 15-20.degree. C. The BF remains approximately the same. For further increases in temperature, the trend toward increasing sensitivity is continued but, in addition, the BF is found to move along the frequency axis to higher frequencies. The NP component of the psychophysical curve remains unchanged in position for temperatures between 25-40.degree. C, but as temperature is decreased 25.degree. C this component acquires a negative slope, and an overall decrease in sensitivity is found. Both intensity and frequency characteristics were obtained from 47 Pacinian corpuscles that were maintained at several different temperatures. The intensity characteristics relate stimulus amplitude to neural firing rates and the frequency characteristics relate stimulus frequency to stimulus amplitude for a given response criterion. Two response criteria were used to generate the frequency characteristics, 1 spike/s and 1 spike/stimulus cycle. For both response criteria the BF of the U-shaped Pacinian corpuscle frequency characteristics is logarithmically related to temperature over the range of 21-41.degree. C. At temperatures between 21-29.degree. C, the sensitivity of the receptors decreases with temperature. Little change occurs at temperatures between 29-41.degree. C. The intensity characteristics measured neurophysiologically show plateaus that change position, length and location, depending on the temperature of the preparation. There is fundamental agreement between the psychophysical and neurophysiological data presented and the results further support the theory that the U-shaped portion of the psychophysical frequency characteristic is mediated by the Pacinian corpuscle system. The P component of the psychophysical function is correlated best with the 1 spike/stimulus cycle Pacinian corpuscle frequency characteristic. The wide range of psychophysically measured BF obtained may be explained by uncontrolled temperature conditions during experimentation.