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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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© 2015 Association for Research in Vision and Ophthalmology.
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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