Seeing and feeling size: a cross-modal discrimination experiment

A.M.L. Kappers (Corresponding author), S.E.M. Jansen, W.M. Bergmann Tiest

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Abstract

How does the size of an object that you can only see compare to that of an object you can only feel? To answer this question we have conducted an experiment where participants verbally reported which of the following they perceived as being larger: a visually presented object that could not be touched or a haptically presented object that could not be seen. Haptic exploration was either unrestricted or the object was presented on a stand, thereby removing mass information. Participants were tested in a 2 (exploration) × 2 (shape) within-subject design where each block consisted of a single condition. Within each block, 4 staircases of 20 trials were presented interleaved. Stimuli ranging in size between 2-10 cm³ and 6-14 cm³ were tested against reference volumes of 6 and 10 cm³, respectively (both haptically and visually). The perceptual bias results from subtracting the reference volume from the point of subjective equality. Data from 12 participants show that they are consistent in their judgments within a block. However, it seems that substantial variances arise between blocks and between participants but independent of shape or exploration type. These results suggest that judgment is recalibrated at the start of each block.
Original languageDutch
Pages (from-to)118-119
Number of pages2
JournalPerception
Volume43
Issue numbersuppl. 1
Publication statusPublished - 2014
Externally publishedYes
Event37th European Conference on Visual Perception (ECVP 2014) - Belgrade, Serbia
Duration: 24 Aug 201428 Aug 2014
Conference number: 37

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