电噪声降低振动觉阈值的实验研究

Experimental Study on Electrical Noise Reducing Vibration Sense

本研究利用心理物理学实验来验证外加噪声可增强振动觉的随机共振现象。实验对象是人体手指光滑无毛处;所使用的外加噪声是不同于振动刺激的电噪声;采用二择一的强迫选择规则和变形上下法结合的实验方法。结果表明电噪声能降低所有受试者的振动感觉阈值,并表现出随机共振现象。文中所用测试方法能够滤除测试过程中心理干扰,因此所测结果具有客观,这为利用噪声现象来达到增强感觉的目的提供了进一步的依据。

In this paper, a psychophysical experiment was used to investigate the stochastic resonance phenomenon that external noises can enhance vibration sense. The glabrous skin of the human finger was chosen as the experimental objects on which external noises were exerted. In order to avoid the linear enhancement of sense, electrical noises different from vibration stimulus were introduced to act as the external noises. Two alternative choice forced method and up down transformed rule are combined as experimental methods available. The results indicate that a certain quantity of electrical noise can decrease threshold of vibration sense of subjects, which prove occurrence of stochastic resonance （SR）. Because the experimental scheme of this paper can eliminate psychological disturbance during the experimental process, the results are objective and give the further proof that noises can enhance sense by SR.