Journal
COGNITIVE NEUROPSYCHOLOGY
Volume 33, Issue 1-2, Pages 5-25Publisher
ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
DOI: 10.1080/02643294.2016.1188065
Keywords
Touch; localization; body representation; somatosensation; synchiria
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Funding
- National Institute of Neurological Disorders and Stroke (NINDS) [NS089084]
- National Institute of General Medical Sciences (NIGMS) of the National Institutes of Health (NIH) [GM104941]
- University of Delaware Research Foundation
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In this review, we examine how tactile misperceptions provide evidence regarding body representations. First, we propose that tactile detection and localization are serial processes, in contrast to parallel processing hypotheses based on patients with numbsense. Second, we discuss how information in primary somatosensory maps projects to body size and shape representations to localize touch on the skin surface, and how responses after use-dependent plasticity reflect changes in this mapping. Third, we review situations in which our body representations are inconsistent with our actual body shape, specifically discussing phantom limb phenomena and anesthetization. We discuss problems with the traditional remapping hypothesis in amputees, factors that modulate perceived body size and shape, and how changes in perceived body form influence tactile localization. Finally, we review studies in which brain-damaged individuals perceive touch on the opposite side of the body, and demonstrate how interhemispheric mechanisms can give rise to these anomalous percepts.
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