Higashiyama A, Tashiro T
Psychology Laboratory, University of Osaka Prefecture, Sakai, Japan.
Percept Psychophys. 1990 Oct;48(4):389-97. doi: 10.3758/bf03206693.
Five experiments were carried out to investigate the effects of electrode size on threshold for current pulses that flowed between the ventral and dorsal sides of the right forearm. The main result was that the total current threshold decreases as the size of the cathode and anode increases at least up to 15 mm in diameter. To account for this finding, a neural summation model was proposed, assuming that the central nervous system sums up neural impulses discharged near the conduction paths under electrodes. It was also found that the current flowing from the dorsal to the ventral side provided lower thresholds and more stable localization than the opposite flow of current did. This finding suggested that current threshold and its perceived locus are determined by both the body site on which electrodes were placed and the relative polarity that was assigned to electrodes.
进行了五项实验，以研究电极大小对在右前臂腹侧和背侧之间流动的电流脉冲阈值的影响。主要结果是，至少在直径达到15毫米之前，总电流阈值会随着阴极和阳极尺寸的增加而降低。为了解释这一发现，提出了一种神经总和模型，假设中枢神经系统对电极下传导路径附近发放的神经冲动进行总和。还发现，从背侧流向腹侧的电流比相反方向的电流提供更低的阈值和更稳定的定位。这一发现表明，电流阈值及其感知位置由放置电极的身体部位和分配给电极的相对极性共同决定。
