电感觉中随机共振现象的心理物理学实验研究  

Study on Stochastic Resonance of Electrical Sense based on Psychophysical Experiments.

作　　者：刘军[1] 吴坚[1] 

机构地区：[1]浙江大学生物医学工程及仪器科学学院生物医学工程系,浙江杭州310027

出　　处：《航天医学与医学工程》2006年第4期301-305,共5页Space Medicine & Medical Engineering

基　　金：国家自然科学基金项目资助(30470470);浙江省教育厅项目资助(20050907)

摘　　要：目的通过实验考察人体电感觉在电噪声作用下感觉阈值的变化情况,以此来验证体觉中噪声增强感觉的现象。方法实验中选择人的手指光滑无毛处作为感受部位,并且对此部位施加慢变的方波电信号和一定范围的电噪声。采用的心理物理学实验方法是单刺激随机阶梯法和单择一强迫选择法。结果两种实验方法的结果都表明外加电噪声可使得相应的电感觉阈值降低。结论噪声改善电感觉阈值的现象类似于触觉等感觉系统中的随机共振现象,实验结果进一步验证了该非线性机制也同样发生在电感觉中。Objective To investigate the change of threshold of electrical sense through experiments in the presence of electrical noise according to stochastic resonance phenomenon that has been observed in somatosensory system. Method Psychophysical experiments were carried out using both single stimulus method based on random-gradient method and one-interval-forced-choice method. The glabrous skin of human fingers was choosed as the experimental objects, which was stimulated by square wave electrical signal mixed with electrical noise, Result The corresponding threshold of electrical sense can be reduced by the effect of external electrical noises. Conclusion Although electrical sense is not natural sense,stochastic resonance can occur in it, and effect of noise on enhancing this sense can be implemented by controlling external noises.

关 键 词：随机共振 电感觉 电噪声 心理物理学实验 

分 类 号：R338[医药卫生—人体生理学] B841.4[医药卫生—基础医学]