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Extraretinal and retinal amplitude and phase errors during Filehne illusion and path perception

Freeman, Tom C. A. and Banks, Martin S. and Crowell, James A. (2000) Extraretinal and retinal amplitude and phase errors during Filehne illusion and path perception. Perception and Psychophysics, 62 (5). pp. 900-909. ISSN 0031-5117. doi:10.3758/BF03212076.

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Pursuit eye movements give rise to retinal motion. To judge stimulus motion relative to the head, the visual system must correct for the eye movement by using an extraretinal, eye-velocity signal. Such correction is important in a variety of motion estimation tasks including judgments of object motion relative to the head and judgments of self-motion direction from optic flow. The Filehne illusion (where a stationary object appears to move opposite to the pursuit) results from a mismatch between retinal and extraretinal speed estimates. A mismatch in timing could also exist. Speed and timing errors were investigated using sinusoidal pursuit eye movements. We describe a new illusion--the slalom illusion--in which the perceived direction of self-motion oscillates left and right when the eyes move sinusoidally. A linear model is presented that determines the gain ratio and phase difference of extraretinal and retinal signals accompanying the Filehne and slalom illusions. The speed mismatch and timing differences were measured in the Filehne and self-motion situations using a motion-nulling procedure. Timing errors were very small for the Filehne and slalom illusions. However, the ratios of extraretinal to retinal gain were consistently less than 1, so both illusions are the consequence of a mismatch between estimates of retinal and extraretinal speed. The relevance of the results for recovering the direction of self-motion during pursuit eye movements is discussed.

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Additional Information:© Psychonomic Society, Inc. 2000. (Manuscript received February 23, 1999; revision accepted for publication May 12, 1999.) Some of these results appeared in preliminary form at the annual meeting of the Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida (Freeman, Crowell, & Banks, 1996). This research was supported by Grants AFOSR 93NL366 and NSF DBS-9309820.
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Air Force Office of Scientific Research (AFOSR)93NL366
Issue or Number:5
Record Number:CaltechAUTHORS:20170408-150734305
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Official Citation:Freeman, T.C.A., Banks, M.S. & Crowell, J.A. Perception & Psychophysics (2000) 62: 900. doi:10.3758/BF03212076
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76025
Deposited By: 1Science Import
Deposited On:04 May 2017 23:29
Last Modified:15 Nov 2021 16:56

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