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Jeffrey B. Mulligan, Scott B. Stevenson; A frequency sweep method for rapid estimation of visual delays. Journal of Vision 2008;8(6):366. doi: 10.1167/8.6.366.
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We have previously presented a technique for measuring the time course of visual processing, by introducing artificial delays in the visual feedback resulting from eye movements, and measuring the frequency of the resulting oscillations (Mulligan & Stevenson, VSS 2007). In our earlier work, we measured the frequency of oscillation during extended viewing with a fixed delay, and repeated this for a range of delays, slowly accumulating points on the period-vs-delay function. Here we introduce a sweep-delay method, in which the entire period-vs-delay function is acquired during a single measurement interval of less than a minute. The reduction in measurement time is key for measurements in which one or more stimulus parameters such as luminance or contrast must also be sampled. We have applied the technique to the determination of equiluminant null points of stimuli preferentially stimulating the S-cones.
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