Abstract

Both temporal modulation sensitivity and flicker fusion frequency (CFF) increase with increasing eccentricity. Based upon correlations between temporal sensitivity and cone outer segment diameter, it has been proposed that these temporal frequency changes may be due to differences in receptor morphology.^1,2 Alternatively, CFF can be made independent of retinal eccentricity by M-scaling (scaling for the number of ganglion cells) and F-scaling (scaling for the luminous flux per ganglion cell). These findings suggested that changes in sensitivity may be correlated with post-receptoral factors such as the number of ganglion cells stimulated, their average receptive field size, and cortical magnification.^3,4,5

© 1993 Optical Society of America