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Tracey D. Berger, Marialuisa Martelli, Denis G. Pelli; Flicker flutter: Is an illusory event as good as the real thing?. Journal of Vision 2003;3(6):1. doi: 10.1167/3.6.1.
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Verghese and Stone (1995) showed that reducing the perceived number of objects by grouping also reduces objective performance. Shams, Kamitani, and Shimojo (2000) showed that a single flash accompanied by multiple beeps appears to flash more than once. We show that objective orientation-discrimination performance depends solely on the perceived number of flashes, independent of the actual number of beeps and flashes. Thus the unit of perceptual analysis seems to be a perceived event, independent of how it is induced.
Each observer was tested in the orientation
discrimination task with three different perceived flash rates achieved in two
different ways: by varying the beep rate accompanying a 4-Hz flashing grating
patch or by varying flash rate accompanied by an equal number of beeps.
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