Abstract
To study the effect of the intensity, duration, spectral composition, and diameter of the light spot on the amplitude and shape of the response of single rods of the frog retina, potentials were recorded intracellularly. The rods tested could be divided into two groups on the basis of their responses to light spots of different spectral composition: those with maxima of sensitivity at 507 ± 8 nm and 442 ± 8 nm. With an increase in the intensity of light the response amplitude rose gradually and the time for the response to rise to its maximum was shortened. A bright flash temporarily inhibited the sensitivity of the cell to subsequent test flashes. If light spots of larger diameter (1000–1500 µ) were presented a delayed depolarization wave, due to illumination of the distant surroundings of the receptor, was observed in the course of recovery of the photic response; this effect was maximal for stimulation with red light and it was evidently induced by horizontal cell activity. The possible functional role of the depolarizing effect of illumination of the distant surroundings of the receptor is discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
