Vertical-disparity pooling across spatially segregated surfaces

L M O'Kane, P B Hibbard

Research output: Contribution to journalAbstractpeer-review


Vertical disparities contribute to scaling of size and depth only with sufficiently large fields of view, which suggest that their use for small objects is limited (Bradshaw et al, 1995 Vision Research 36 1255 - 1264). We investigated the possibility that this might be overcome if information from different surfaces could be pooled over three-dimensional space. Observers adjusted the size and shape of a virtual, binocularly defined ellipsoid to match those of a real, hand-held tennis ball. The virtual ellipsoid was presented at four distances (30, 40, 50, and 60 cm) in four conditions: (i) alone; (ii) surrounded by a frontoparallel frame at a distance of 46 cm; no information was presented in a 23.2 deg × 24.4 deg rectangle surrounding the ball; (iii) manipulated vertical disparities in the frame simulated a distance of 26 cm; or (iv) 66 cm. In all conditions, perceived size and shape varied with distance. Settings were not influenced by the presence of the surround. Manipulation of vertical disparity in the surround to simulate a closer viewing distance influenced the perceived shape (but not size) of the ball, consistent with the use of a smaller estimate of distance to scale disparities. Vertical-disparity pooling thus alters the perceived shape of objects, even for surfaces that are clearly spatially segregated
Original languageEnglish
Pages (from-to)154-155
Number of pages2
Issue numberECVP Abstract Supplement
Publication statusPublished - 2002


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