Context effects in haptic perception of roughness

M. Kahrimanovic, W. M. Bergmann Tiest, A. M. L. Kappers

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Abstract

The influence of temporal and spatial context during haptic roughness perception was investigated in two experiments. Subjects examined embossed dot patterns of varying average dot distance. A two-alternative forced-choice procedure was used to measure discrimination thresholds and biases. In Experiment 1, subjects had to discriminate between two stimuli that were presented simultaneously to adjacent fingers, after adaptation of one of these fingers. The results showed that adaptation to a rough surface decreased the perceived roughness of a surface subsequently scanned with the adapted finger, whereas adaptation to a smooth surface increased the perceived roughness (i.e. contrast after effect). In Experiment 2, subjects discriminated between subsequent test stimuli, while the adjacent finger was stimulated simultaneously. The results showed that perceived roughness of the test stimulus shifted towards the roughness of the adjacent stimulus (i.e. assimilation effect). These contextual effects are explained by structures of cortical receptive fields. Analogies with comparable effects in the visual system are discussed.
Original languageEnglish
Pages (from-to)287-297
Number of pages11
JournalExperimental Brain Research
Volume194
Issue number2
DOIs
Publication statusPublished - 2009
Externally publishedYes

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Kahrimanovic, M. ; Bergmann Tiest, W. M. ; Kappers, A. M. L. / Context effects in haptic perception of roughness. In: Experimental Brain Research. 2009 ; Vol. 194, No. 2. pp. 287-297.
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Context effects in haptic perception of roughness. / Kahrimanovic, M.; Bergmann Tiest, W. M.; Kappers, A. M. L.

In: Experimental Brain Research, Vol. 194, No. 2, 2009, p. 287-297.

Research output: Contribution to journalArticleAcademicpeer-review

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