Haptic discrimination of doubly curved surfaces.

A.M.L. Kappers*, Jan J. Koenderink, S. F. Te Pas

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


Active haptic discrimination of mathematically well-defined surfaces was investigated. The quadric surfaces were defined in terms of 'shape index'--a quantity describing shape--and 'curvedness'--a quantity describing overall curvature. In these experiments shape index was varied and curvedness kept constant. The influence of laterality (unilateral versus bilateral discrimination) was tested in separate sessions. No influence of shape on the discrimination of solid objects was found. From the results an estimate can be made of the just-noticeable difference in terms of shape-index units. There was a significant effect of laterality on discrimination: performance with unilateral (successive) examination (both with left and with right hand) was better than with bilateral (simultaneous) examination.

Original languageEnglish
Pages (from-to)1483-1490
Number of pages8
Issue number12
Publication statusPublished - 1994


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