Cite as:
Surovicheva N S, Lebedev D G, Bozhkova V P, Nikolaev D P, 2009, "Apparent motion testing for pursuit efficiency in human vision" Perception 38 ECVP Abstract Supplement, page 171

Apparent motion testing for pursuit efficiency in human vision

N S Surovicheva, D G Lebedev, V P Bozhkova, D P Nikolaev

Our previous experiments have shown that in the case of apparent motion the smooth pursuit (SP) program in humans is also initialized. It allowed us to construct a portable device for analyzing the pursuit of apparent motion that does not require the direct measurements of eye movements. The impression of smooth object motion is created by a sequence of flashes of LEDs separated by a fixed interflash interval, Δx about 1°. The flash is chosen long enough (50 - 70 ms) to modulate the LED brightness as a function of time. It allows to create illusory object as the retinal projection. By choosing the profile of the brightness-vs-time function of a LED, it is possible to form the shape of the apparent object as the combination of dashes and dots. If the difference between target velocity and eye velocity is small (the pursuit is smooth), a stable retinal projection is formed. Since it is formed only as a result of the SP process, correct observer's answer on the object appearance is an objective measure of SP ability. We show that most of the subjects maintain the SP in apparent motion testing but that they strongly differed from one another in the SP efficiency.

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