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  Categorizing natural objects: a comparison of the visual and the haptic modalities

Gaissert, N., & Wallraven, C. (2012). Categorizing natural objects: a comparison of the visual and the haptic modalities. Experimental Brain Research, 216(1), 123-134. doi:10.1007/s00221-011-2916-4.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-B852-E Version Permalink: http://hdl.handle.net/21.11116/0000-0001-8A54-5
Genre: Journal Article

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Gaissert, N1, 2, Author              
Wallraven, C, Author              
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1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Although the hands are the most important tool for humans to manipulate objects, only little is known about haptic processing of natural objects. Here, we selected a unique set of natural objects, namely seashells, which vary along a variety of object features, while others are shared across all stimuli. To correctly interact with objects, they have to be identified or categorized. For both processes, measuring similarities between objects is crucial. Our goal is to better understand the haptic similarity percept by comparing it to the visual similarity percept. First, direct similarity measures were analyzed using multidimensional scaling techniques to visualize the perceptual spaces of both modalities. We find that the visual and the haptic modality form almost identical perceptual spaces. Next, we performed three different categorization tasks. All tasks exhibit a highly accurate processing of complex shapes of the haptic modality. Moreover, we find that objects grouped into the same category form regions within the perceptual space. Hence, in both modalities, perceived similarity constitutes the basis for categorizing objects. Moreover, both modalities focus on shape to form categories. Taken together, our results lead to the assumption that the same cognitive processes link haptic and visual similarity perception and the resulting categorization behavior.

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 Dates: 2012-01
 Publication Status: Published in print
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 Identifiers: DOI: 10.1007/s00221-011-2916-4
BibTex Citekey: GaissertW2011_2
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Title: Experimental Brain Research
  Other : Exp. Brain Res.
Source Genre: Journal
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Publ. Info: Heidelberg : Springer-Verlag
Pages: - Volume / Issue: 216 (1) Sequence Number: - Start / End Page: 123 - 134 Identifier: ISSN: 0014-4819
CoNE: https://pure.mpg.de/cone/journals/resource/954925398496