The subjective magnitude of sensation for electrocutaneous stimuli is experimentally studied. In experiment I, two pulse trains, which have the same pulse interval and stimulus duration but have the different pulse heights (IA and IB) and pulse widths (TA and TB), have been applied to the skin just above the triceps of a subject via wet electrodes. And tests were made using AB method how various stimulus pairs give the different magnitude sensation or how they give the same magnitude sensation under the various conditions of IB and TB for several values of pulse interval as a parameter, while IA and TA were fixed to 4.7mA and 100 μs respectively, as a reference. In experiment II, the threshold current of minimum sensation for various pulse width has been examined also by using AB method. The most important findings : 1) For the pulse trains of 100 ms and 50 ms pulse interval, stimulus A with pulse height IA and pulse width TA and stimulus B with IB and TB give the same magnitude sensation if they meet the following condition : IA2TA=IB2TB (even if TA≠TB) threshold current ＜ IA, IB＜＜ threshold of pain 0 ＜ TA., TB ＜1000 μs 2) For the stimuli of pulse interval of 20 ms and 10 ms, the same tendencies have been found, but the difference is slightly detected even if they meet the condition of 1). 3) The threshold of minimum sensation is obtained when the current I reaches the value which holds the condition I2T=constant for various Ts, if T＜1000μs. These facts suggest that the electrocutaneous magnitude sensation is strongly affected by the energy of one pulse if the pulse width is less than 1 ms, more correctly, by the integrated value of instantaneous power (ZI2) for about 1ms.
雑誌名
医用電子と生体工学 : 日本ME学会雑誌 = Japanese journal of medical electronics and biological engineering : JJME
経皮電気刺激の強度感覚に対するパルス高とパルス幅の効果
tachi_1977_d06.pdf
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