Davies J R, Freeman T C A, 2009, "The Filehne Illusion following adaptation to simultaneous smooth pursuit eye movement and spatially non-coincident retinal motion" Perception 38 ECVP Abstract Supplement, page 172
The Filehne Illusion following adaptation to simultaneous smooth pursuit eye movement and spatially non-coincident retinal motion
J R Davies, T C A Freeman
Comparing estimates of retinal motion and smooth pursuit helps compensate for the retinal effects of eye movement. Recent models claim that the pursuit estimate is based on retinal and extra-retinal components by showing that the Filehne illusion (perceived motion of a stationary background during pursuit) changes following simultaneous adaptation to pursuit and retinal motion. However, this could equally be accounted for by adaptation of retinal motion sensors (the velocity aftereffect, VAE). We tested these models using retinal motion (R) adaptation that was spatially non-coincident with the test stimulus. Observers simultaneously adapted to a pursuit target and retinal motion flanking a central blank strip. Pursuit and retinal motion executed left-right triangle waves, either in-phase or out-of-phase. Test stimuli consisted of pursuit over a central background, background motion was adjusted by a staircase to yield the point-of-subjective-stationarity (PSS). The Filehne Illusion changed for both in-phase and out-of-phase conditions, with the PSS describing an inverted U-shaped function symmetrical about R=0 deg s-1. This is difficult to explain using a reference signal, which predicts a monotonic increase in PSS across R. We suggest that non-coincidental retinal adaptation induces a retinal VAE in the central test. Experiments will be reported to test this idea.
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