抄録
Based on the principle of neutralization of retinal induction the velocity of spreading induction was measured in various regions of the human retina.
1. No significant regional difference could be observed. For example, 1.751±0.035 and 1.716±0.019mm./sec. were obtained at the fovea, while 1.719±0.035, 1.735±0.036 and 1.688±0.030mm./sec. were obtained in peripheral areas 20° from the fovea.
2. No significant difference was found among velocities of propagation in different directions.
3. The extent of the field of retinal induction caused by a definite stimulus was measured in various regions of the retina. The extent was greater at the fovea than at 20° from the fovea.
4. The horizontal extent of the field caused by a vertical line stimulus was greater than the vertical extent of the field caused by a horizontal line of the same length.
5. It was argued that the extent of the field depends greatly on the energy of spreading induction, while its velocity is almost independent of energy.
