A specialization for vertical disparity discontinuities

Because our eyes are set apart horizontally in our head, most disparities between the retinal images are horizontal. However, vertical disparities also occur, and can influence depth perception. The classic example is Ogle's induced effect (K. N. Ogle, 1938), in which applying a uniform vertica...

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Detalles Bibliográficos
Autores: Serrano Pedraza, Ignacio, Phillipson, Graeme P, Read, Jenny C A
Tipo de recurso: artículo
Fecha de publicación:2010
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/44960
Acceso en línea:https://hdl.handle.net/20.500.14352/44960
Access Level:acceso abierto
Palabra clave:159.9.07
159.93
Binocular vision
Stereo-resolution
Vertical disparity
Relative disparity
Induced effect
Psicología experimental
Percepción
6106 Psicología Experimental
6106.09 Procesos de Percepción
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spelling A specialization for vertical disparity discontinuitiesSerrano Pedraza, IgnacioPhillipson, Graeme PRead, Jenny C A159.9.07159.93Binocular visionStereo-resolutionVertical disparityRelative disparityInduced effectPsicología experimentalPercepción6106 Psicología Experimental6106.09 Procesos de PercepciónBecause our eyes are set apart horizontally in our head, most disparities between the retinal images are horizontal. However, vertical disparities also occur, and can influence depth perception. The classic example is Ogle's induced effect (K. N. Ogle, 1938), in which applying a uniform vertical magnification to one eye's image produces the illusion that the surface has been rotated around a vertical axis. This is thought to be because uniform vertical magnifications can be produced in natural viewing when the eyes are in eccentric gaze (J. E. Mayhew, 1982; J. E. Mayhew & H. C. Longuet-Higgins, 1982). Thus, vertical magnification is taken by the visual system as indicating that the viewed surface is slanted away from the line of sight. Here, we demonstrate that the induced effect becomes stronger when the sign of the magnification alternates across the visual field. That is, as one moves horizontally across the screen, the left eye's image is alternately stretched and squashed vertically relative to the right eye's image, producing the illusion of a surface folded into triangular corrugations (H. Kaneko & I. P. Howard, 1997). For most subjects, slant judgments in this folded surface have lower thresholds and greater reliability than the classic induced effect, where magnification is applied uniformly across the whole visual field. This is remarkable, given that the disparity pattern of the classic induced effect can be produced by real surfaces with the eyes in eccentric gaze, whereas it is not clear that stripes of alternating vertical disparity could be produced by any physically realizable situation. The analogous improvement for alternating horizontal magnification is attributed to neuronal mechanisms which detect the jumps in horizontal disparity that occur at object boundaries. Our results suggest that a similar, previously unreported system may exist for vertical disparity. Jumps in vertical disparity do occur at object boundaries, and we suggest that our surprising results may reflect the activation of neuronal mechanisms designed to detect these.Universidad Complutense de Madrid20102010-01-0120102010-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/44960reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/449602026-06-02T12:44:21Z
dc.title.none.fl_str_mv A specialization for vertical disparity discontinuities
title A specialization for vertical disparity discontinuities
spellingShingle A specialization for vertical disparity discontinuities
Serrano Pedraza, Ignacio
159.9.07
159.93
Binocular vision
Stereo-resolution
Vertical disparity
Relative disparity
Induced effect
Psicología experimental
Percepción
6106 Psicología Experimental
6106.09 Procesos de Percepción
title_short A specialization for vertical disparity discontinuities
title_full A specialization for vertical disparity discontinuities
title_fullStr A specialization for vertical disparity discontinuities
title_full_unstemmed A specialization for vertical disparity discontinuities
title_sort A specialization for vertical disparity discontinuities
dc.creator.none.fl_str_mv Serrano Pedraza, Ignacio
Phillipson, Graeme P
Read, Jenny C A
author Serrano Pedraza, Ignacio
author_facet Serrano Pedraza, Ignacio
Phillipson, Graeme P
Read, Jenny C A
author_role author
author2 Phillipson, Graeme P
Read, Jenny C A
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 159.9.07
159.93
Binocular vision
Stereo-resolution
Vertical disparity
Relative disparity
Induced effect
Psicología experimental
Percepción
6106 Psicología Experimental
6106.09 Procesos de Percepción
topic 159.9.07
159.93
Binocular vision
Stereo-resolution
Vertical disparity
Relative disparity
Induced effect
Psicología experimental
Percepción
6106 Psicología Experimental
6106.09 Procesos de Percepción
description Because our eyes are set apart horizontally in our head, most disparities between the retinal images are horizontal. However, vertical disparities also occur, and can influence depth perception. The classic example is Ogle's induced effect (K. N. Ogle, 1938), in which applying a uniform vertical magnification to one eye's image produces the illusion that the surface has been rotated around a vertical axis. This is thought to be because uniform vertical magnifications can be produced in natural viewing when the eyes are in eccentric gaze (J. E. Mayhew, 1982; J. E. Mayhew & H. C. Longuet-Higgins, 1982). Thus, vertical magnification is taken by the visual system as indicating that the viewed surface is slanted away from the line of sight. Here, we demonstrate that the induced effect becomes stronger when the sign of the magnification alternates across the visual field. That is, as one moves horizontally across the screen, the left eye's image is alternately stretched and squashed vertically relative to the right eye's image, producing the illusion of a surface folded into triangular corrugations (H. Kaneko & I. P. Howard, 1997). For most subjects, slant judgments in this folded surface have lower thresholds and greater reliability than the classic induced effect, where magnification is applied uniformly across the whole visual field. This is remarkable, given that the disparity pattern of the classic induced effect can be produced by real surfaces with the eyes in eccentric gaze, whereas it is not clear that stripes of alternating vertical disparity could be produced by any physically realizable situation. The analogous improvement for alternating horizontal magnification is attributed to neuronal mechanisms which detect the jumps in horizontal disparity that occur at object boundaries. Our results suggest that a similar, previously unreported system may exist for vertical disparity. Jumps in vertical disparity do occur at object boundaries, and we suggest that our surprising results may reflect the activation of neuronal mechanisms designed to detect these.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-01-01
2010
2010-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/44960
url https://hdl.handle.net/20.500.14352/44960
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.301603

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