In 1934 both Bartley1 and I2 reported the effect of intensity of light on the latency of action potentials in the visual cortex of the rabbit in response to photic stimulation of the eye. We demonstrated that the latency of the cortical potential varies inversely with the intensity of light and presented evidence to show that the latent period of the cortical potential varies according to that of the retinal potential. But we differed on one point: The latency as determined by me was considerably longer.
It seemed to me that the reason for this discrepancy might be sought in the difference either in the anesthetics used or in the methods of photostimulation employed. I used dial to anesthetize my rabbits, while Bartley narcotized his animals with magnesium sulfate, ether or amytal. Bartley stimulated the eyes of his rabbits with short exposures to a lighted lamp, while I
GING-HSI WANG. LATENCY OF CORTICAL AND RETINAL ACTION POTENTIALS INDUCED BY ILLUMINATION OF THE EYE. Arch NeurPsych. 1937;37(4):772–775. doi:10.1001/archneurpsyc.1937.02260160072007