Sagan P M, Stell M E, Bryan G K, Adey W R
Research Service, Jerry L. Pettis Memorial Veterans' Hospital, Loma Linda, CA 92357.
Bioelectromagnetics. 1987;8(3):303-13. doi: 10.1002/bem.2250080309.
Rats were trained to press levers to indicate the presence or absence of 60-Hz vertical electric fields at intensities from 0 to 27 kV/m (rms). The probability of detecting the field increased as the strength of the field increased. The shape of the detection curve (psychometric function) for most subjects (Ss) was similar whether the discriminative stimulus was the electric field or a tone. Two protocols were used to estimate the minimum field intensity necessary to detect the field (Reiz Limen, RL). The RL was estimated to be 13.3 kV/m (rms) when using one protocol (the staircase method) and 7.9 kV/m (rms) when using another protocol (the method of constant stimuli).
训练大鼠按压杠杆，以表明是否存在强度为0至27 kV/m（均方根值）的60赫兹垂直电场。随着电场强度的增加，检测到电场的概率也增加。对于大多数受试者（Ss）而言，无论辨别刺激是电场还是音调，检测曲线（心理测量函数）的形状都是相似的。使用了两种方案来估计检测电场所需的最小场强（刺激阈限，RL）。使用一种方案（阶梯法）时，RL估计为13.3 kV/m（均方根值）；使用另一种方案（恒定刺激法）时，RL估计为7.9 kV/m（均方根值）。
