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Pavlova M, Sokolov A, 2000, "Speed perception is affected by the Ebbinghaus - Titchener illusion" Perception 29(10) 1203 – 1208
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Speed perception is affected by the Ebbinghaus - Titchener illusion

Marina Pavlova, Alexander Sokolov

Received 15 February 2000, in revised form 28 June 2000

Abstract. We examined whether the apparent extent of motion affects speed perception. On the first presentation of each trial, a light dot travelled horizontally across a central circle of one of the Ebbinghaus configurations (with either small or large inducing elements). On the second presentation, observers adjusted the speed of a dot moving within the central circle alone so as to match the speed perceived in the first presentation. For all stimulus speeds (1.3, 2.1, and 5.5 deg s^-1), the matched speed with small inducing circles was systematically less than that with large inducing circles. The findings indicate that the perceived speed depends on the apparent extent of motion: the larger the apparent size of a frame, the slower the apparent speed. These results are consistent with the predictions of transposition effects in visual motion.

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