A critical duration effect in suprathreshold pattern discrimination

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PARKER, Denis M., Rita LEYDEL, Juan D. DELIUS, M. WILLIAMS, 2002. A critical duration effect in suprathreshold pattern discrimination. Twenty-fifth European Conference on Visual Perception : ECVP '02. Glasgow, Aug 25, 2002 - Aug 29, 2002. In: Twenty-fifth European Conference on Visual Perception (ECVP '02) : Abstract, pp. 43. ISSN 0301-0066. eISSN 1468-4233. Available under: doi: 10.1177/03010066020310S101

@inproceedings{Parker2002-08criti-46616, title={A critical duration effect in suprathreshold pattern discrimination}, year={2002}, doi={10.1177/03010066020310S101}, number={31, 1 Suppl.}, issn={0301-0066}, series={Perception}, booktitle={Twenty-fifth European Conference on Visual Perception (ECVP '02) : Abstract}, author={Parker, Denis M. and Leydel, Rita and Delius, Juan D. and Williams, M.} }

Williams, M. Delius, Juan D. eng Leydel, Rita 2019-08-06T13:49:55Z Leydel, Rita Parker, Denis M. 2019-08-06T13:49:55Z A critical duration effect in suprathreshold pattern discrimination The existence of critical duration effects in the integration of stimulus energy at threshold has been known since 1885 following Bloch's observations. Evidence is presented that a critical duration effect also occurs in a suprathreshold-pattern-discrimination task. Twelve observers performed a speeded, successive, 480 trial, same/different discrimination task. One of six randomly selected patterns was shown on a monitor screen for 500 ms and after a blank interval of 1200 ms was followed by a second pattern, either randomly the same or different, which was displayed for a variable duration between 20 and 1000 ms. Decision times showed a significant effect of exposure duration (F<sub>7, 77</sub> = 2:65, p = 0:02), with minima occurring at 80 ms and 120 ms. Error rates were low (5%) and did not show an effect of pattern duration. In a second experiment, simple RTs to the same set of patterns at the same exposure durations were examined and a small but non- significant rise over the exposure durations from 20 ms to 120 ms was found (F<sub>7, 77</sub> = 1:74, p = 0:11). It is concluded that decision times for successive same/different discriminations are fastest with exposure durations in the region of 80 - 120 ms. Williams, M. 2002-08 Delius, Juan D. Parker, Denis M.

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