Bare hands and attention: evidence for a tactile representation of the human body

Neuropsychologia
H Branch Coslett, Eunhui Lie

Abstract

If brain lesions impair the allocation of attention to a representation of the body surface and the hand may serve as an attentional focus or "wand", one might expect that somatosensory deficits caused by cerebral lesions would be ameliorated by contact with the ipsilesional hand. To test this prediction, tactile detection tasks were administered to two subjects with right hemisphere lesions. Subject CB's left tactile extinction was investigated in conditions in which the degree of contact between the right and left hands and the spatial relationship between his hands was systematically varied. His left tactile extinction was significantly reduced by touch of the right hand. Similarly, extinction at the left knee was ameliorated by touch of the knee by the right hand; touch of the right foot had no effect. Subject NC's ability to detect a tactile stimulus delivered to the left side was systematically assessed in conditions in which the hands touched and the spatial relationship between the hands was varied. His ability to detect a touch on the left hand improved in conditions in which the left hand was touched by the right hand. This effect was not observed if direct contact between the two hands was prevented by inserting a th...Continue Reading

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Citations

Dec 30, 2009·Experimental Brain Research·Marjolein P M KammersH Chris Dijkerman
Sep 29, 2011·Experimental Brain Research·Massimiliano ConsonLuigi Trojano
Oct 27, 2011·Neurocase·Jennifer A StevensPeter M Vishton
Oct 5, 2011·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·H E van StralenH C Dijkerman
Oct 31, 2006·Journal of Cognitive Neuroscience·Argye E HillisLynda Ken
Jan 12, 2013·Attention, Perception & Psychophysics·Christian Frings, Charles Spence
Sep 26, 2008·Consciousness and Cognition·Simone Schütz-BosbachPatrick Haggard
Oct 15, 2014·The Quarterly Journal of Experimental Psychology : QJEP·Matthew R Longo
Jul 1, 2015·Frontiers in Psychology·Laurence R HarrisLisa M Pritchett
Sep 28, 2010·Current Biology : CB·Marjolein P M KammersPatrick Haggard
Jul 9, 2016·Cognitive Neuropsychology·Jared Medina, H Branch Coslett
Feb 10, 2011·Psychological Science·Flavia ManciniPatrick Haggard
Aug 31, 2017·Scientific Reports·Matthew R Longo

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