Haptic identification of curved surfaces

Astrid M L Kappers*, Jan J. Koenderink, Inge Lichtenegger

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


In two experiments, the active haptic identification of three-dimensional mathematically welldefined objects is investigated. The objects, quadric surfaces, are defined in terms of the shape index, a quantity describing the shape, and curvedness, a quantity describing overall curvature. Both shape index and curvedness are found to have a significant influence on haptic shape identification . Concave surfaces lead to a larger spread in responses than convex ones. Hyperbolic surfaces show a slight tendency to be identified with more difficulty than elliptic ones. Surfaces with a high curvedness are identified more easily than those with a low curvedness. Results from experiments with constant and with random curvedness are indistinguishable . It is concluded that shape index and curvedness are psychophysically not confounded.

Original languageEnglish
Pages (from-to)53-61
Number of pages9
JournalPerception & Psychophysics
Issue number1
Publication statusPublished - Jan 1994
Externally publishedYes


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