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The effects of inve...
The effects of inverting prisms on the horizontal-vertical illusion : a systematic effect of downward gaze
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- Richter, Hans O. (författare)
- Högskolan i Gävle,Centrum för belastningsskadeforskning,Ämnesavdelningen för folkhälsovetenskap,Department of Optometry and Optical Science, Faculty of Physics and Mathematics, University of Latvia, Riga, Latvia
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- Wennberg, Patrik (författare)
- Department of Optometry and Optical Science, Faculty of Physics and Mathematics, University of Latvia, Riga, Latvia
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- Raudsepp, Jaanus (författare)
- Högskolan i Gävle,Centrum för belastningsskadeforskning
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(creator_code:org_t)
- 2007-07-04
- 2007
- Engelska.
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Ingår i: Experimental Brain Research. - : Springer Science and Business Media LLC. - 0014-4819 .- 1432-1106. ; 183:1, s. 9-15
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The purpose of this work is to compare the relative contributions from the extraocular and sensory systems on the magnitude of the horizontal-vertical illusion (HVI). The visual HVI refers to the general tendency to overestimate vertical extensions of small-scale lines on a picture plane relative to the horizontal by 4-16% depending on the method of measurement. The HVI line stimuli consisted of luminous vertical and horizontal lines forming "L-profiles" located in the frontoparallel plane at a 45 cm viewing distance, collinearly with a binocular gaze. The home position of gaze was aligned to the center of the screen with the ear-eye angle concordant with the environmental horizontal. Illusion strength was quantified when subjects fixated the HVI line stimuli in four quadrants of the visual field. The HVI was also viewed through prism lenses that inverted the retinal images by 180 degrees , thereby dissociating the sensory "up-down" direction from the oculomotor up-down frame of reference. The results revealed a systematically lower magnitude of the HVI in the bottom visual field regardless of whether subjects fixated the HVI with the distorting prisms or without. Taken together, these results suggest that the HVI is sensitive to small-angle gaze shifts. In agreement with several recent findings, these results are interpreted as implying that the brain imposes an enhanced analytic structure on the ascending sensory information during downward gaze.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Arbetsmedicin och miljömedicin (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Occupational Health and Environmental Health (hsv//eng)
Nyckelord
- Gaze; Horizontal vertical illusion; Prisms; Sensorimotor; Visual space
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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