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Integration of Hand and Finger Location in External Spatial Coordinates for Tactile Localization

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Title: Integration of Hand and Finger Location in External Spatial Coordinates for Tactile Localization
Language: English
Authors: Heed, Tobias, Backhaus, Jenny, Roder, Brigitte
Source: Journal of Experimental Psychology: Human Perception and Performance. Apr 2012 38(2):386-401.
Availability: American Psychological Association. Journals Department, 750 First Street NE, Washington, DC 20002-4242. Tel: 800-374-2721; Tel: 202-336-5510; Fax: 202-336-5502; e-mail: order@apa.org; Web site: http://www.apa.org/publications
Peer Reviewed: Y
Physical Description: PDF
Page Count: 16
Publication Date: 2012
Document Type: Journal Articles
Reports - Research
Education Level: Higher Education
Descriptors: Tactual Perception, Spatial Ability, Stimuli, Human Body, Coding, Reaction Time, Neurological Organization, Orientation
DOI: 10.1037/a0024059
ISSN: 0096-1523
Abstract: Tactile stimulus location is automatically transformed from somatotopic into external spatial coordinates, rendering information about the location of touch in three-dimensional space. This process is referred to as tactile remapping. Whereas remapping seems to occur automatically for the hands and feet, the fingers may constitute an exception in that some studies have implied purely somatotopic coding of touch to the fingers. When participants judge the order of two tactile stimuli, they often err when the stimulated body parts (usually the two hands) are crossed, presumably because somatotopic and external coordinates are in conflict in crossed postures. Using this task, we investigated, first, whether the fingers are unlike other limbs with regard to spatial coding, by testing whether crossing effects, indicative of external coding, were observable when stimulating two fingers, either on the same or on different hands. Second, we investigated the interaction of hand and finger posture in tactile localization of finger stimuli. Crossing effects emerged when fingers and hands were crossed, suggesting external coding for all body parts. Crossing effects were larger when both hand and finger were located in the hemifield opposite to their body side, and smaller when only hand or finger lay in the opposite hemifield. We suggest that tactile location is estimated by integrating the external location of all relevant body parts, here of a finger and its belonging hand, and that such integrative coding may represent a general principle for body part processing as well as for tool use. (Contains 3 figures and 5 tables.)
Abstractor: As Provided
Number of References: 82
Entry Date: 2013
Accession Number: EJ991058
Database: ERIC
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  Data: Integration of Hand and Finger Location in External Spatial Coordinates for Tactile Localization
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  Data: American Psychological Association. Journals Department, 750 First Street NE, Washington, DC 20002-4242. Tel: 800-374-2721; Tel: 202-336-5510; Fax: 202-336-5502; e-mail: order@apa.org; Web site: http://www.apa.org/publications
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  Data: Tactile stimulus location is automatically transformed from somatotopic into external spatial coordinates, rendering information about the location of touch in three-dimensional space. This process is referred to as tactile remapping. Whereas remapping seems to occur automatically for the hands and feet, the fingers may constitute an exception in that some studies have implied purely somatotopic coding of touch to the fingers. When participants judge the order of two tactile stimuli, they often err when the stimulated body parts (usually the two hands) are crossed, presumably because somatotopic and external coordinates are in conflict in crossed postures. Using this task, we investigated, first, whether the fingers are unlike other limbs with regard to spatial coding, by testing whether crossing effects, indicative of external coding, were observable when stimulating two fingers, either on the same or on different hands. Second, we investigated the interaction of hand and finger posture in tactile localization of finger stimuli. Crossing effects emerged when fingers and hands were crossed, suggesting external coding for all body parts. Crossing effects were larger when both hand and finger were located in the hemifield opposite to their body side, and smaller when only hand or finger lay in the opposite hemifield. We suggest that tactile location is estimated by integrating the external location of all relevant body parts, here of a finger and its belonging hand, and that such integrative coding may represent a general principle for body part processing as well as for tool use. (Contains 3 figures and 5 tables.)
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        PageCount: 16
        StartPage: 386
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      – SubjectFull: Tactual Perception
        Type: general
      – SubjectFull: Spatial Ability
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      – SubjectFull: Stimuli
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      – SubjectFull: Human Body
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      – SubjectFull: Coding
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      – SubjectFull: Reaction Time
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      – SubjectFull: Neurological Organization
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      – SubjectFull: Orientation
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      – TitleFull: Integration of Hand and Finger Location in External Spatial Coordinates for Tactile Localization
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