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Fig. 6. Effects of stimulus duration on response amplitude and image blur. (A,B) Mean contrast amplification {Delta}V/{Delta}C of 7 male (A) and 7 female (B) photoreceptors to simulated target stimuli plotted against stimulus duration {tau}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 {tau}v/{tau}c of the same male (C) and female (D) photoreceptors to simulated target stimuli, plotted against stimulus duration {tau}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.