Population-response model for vibrotactile spatial summation.
Population-response model for vibrotactile spatial summation.
复制标题
振动触觉空间总和的群体响应模型。
DOI：
10.1080/08990220500262075
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Istefanopulos,Yorgo
中科院分区：
文献类型：
--
作者：
Guclu,Burak;Gescheider,GeorgeA;Bolanowski,StanleyJ;Istefanopulos,Yorgo
基于以往的生理和心理物理数据的计算模型的人类帕西尼（P）心理物理通道。该模型可以预测在简单的心理物理任务的检测概率，因此心理测量功能和阈值。该模型模拟刺激变量和固定的无毛皮肤部位与不同大小的接触器，包括猴子P-纤维敏感性的空间变化。因此，它特别适合于研究空间求和，即阈值随接触器面积的增加而提高。神经整合的选择性贡献（n.i.）和概率求和（p.s.）也被纳入模型。模型预测相比，Gescheider等人的心理物理结果。该模型对接触器尺寸的影响的性能是非常好的。除了预测当接触器面积加倍时阈值提高约3 dB之外，该模型还揭示了p. s.和N.I.此外，该模型断言，当使用小接触器时，阈值在很大程度上由神经整合决定。本文讨论的这些和其他研究结果表明，所提出的模型是一个有用的工具，制定可检验的假设。虽然该模型也可以模拟一些时间的总和效应，模拟结果不符合以前的时间响应特性的数据。因此，该模式需要在这方面加以改进。
A computational model based on previous physiological and psychophysical data is presented for the human Pacinian (P) psychophysical channel. The model can predict the probability of detection in simple psychophysical tasks, and hence psychometric functions and thresholds. The model simulates stimulating variable and fixed glabrous skin sites with different-sized contactors and includes spatial variation of monkey P-fiber sensitivities. Therefore, it is especially suitable for studying spatial summation, i.e. the improvement of threshold with increasing contactor area. Selective contributions of neural integration (n.i.) and probability summation (p.s.) are also incorporated into the model. Model predictions are compared to psychophysical results of Gescheider et al. . The performance of the model regarding the effects of contactor size is very good. In addition to predicting approximately 3 dB improvement of thresholds when the contactor area is doubled, the model also reveals nonlinear contributions of p.s. and n.i. Furthermore, the model asserts that thresholds are largely governed by neural integration when small contactors are used. These and other findings discussed in the article show that the presented model is a helpful tool for formulating testable hypotheses. Although the model can also simulate some temporal summation effects, simulation results do not conform well to previous data on temporal response properties. Thus, the model needs to be refined in that respect.