Fig. 6. Effects of stimulus duration on response amplitude and image blur. (A,B) Mean contrast amplification V/C of 7 male (A) and 7 female (B) photoreceptors to simulated target stimuli plotted against stimulus duration _c. Males preferentially amplify high contrast (near) stimuli. The amplification performed by the female photoreceptor is less powerful than that of the male photoreceptor and exhibits non-linear contrast gain at only the longest durations. Below 4 or 5 ms in both sexes, the response decreases as stimulus power declines. (C,D) Mean temporal blur factor _v/_c of the same male (C) and female (D) photoreceptors to simulated target stimuli, plotted against stimulus duration _c. The male blur factor is always less than the female's for stimuli of comparable contrast, especially at high contrast. Motion blur occurs at stimulus durations below 10 ms.

Return to article