title: Impact of body posture on laterality judgement and explicit recognition tasks performed on self and others' hands.
abstract: Judgments on laterality of hand stimuli are faster and more accurate when dealing with one's own than others' hand, i.e. the self-advantage. This advantage seems to be related to activation of a sensorimotor mechanism while implicitly processing one's own hands, but not during explicit one's own hand recognition. Here, we specifically tested the influence of proprioceptive information on the self-hand advantage by manipulating participants' body posture during self and others' hand processing. In Experiment 1, right-handed healthy participants judged laterality of either self or others' hands, whereas in Experiment 2, an explicit recognition of one's own hands was required. In both experiments, the participants performed the task while holding their left or right arm flexed with their hand in direct contact with their chest ("flexed self-touch posture") or with their hand placed on a wooden smooth surface in correspondence with their chest ("flexed proprioceptive-only posture"). In an "extended control posture", both arms were extended and in contact with thighs. In Experiment 1 (hand laterality judgment), we confirmed the self-advantage and demonstrated that it was enhanced when the subjects judged left-hand stimuli at 270° orientation while keeping their left arm in the flexed proprioceptive-only posture. In Experiment 2 (explicit self-hand recognition), instead, we found an advantage for others' hand ("self-disadvantage") independently from posture manipulation. Thus, position-related proprioceptive information from left non-dominant arm can enhance sensorimotor one's own body representation selectively favouring implicit self-hands processing.
authors: Neuropsychology Laboratory, Department of Psychology, Second University of Naples, Viale Ellittico 31, 81100, Caserta, Italy, massimiliano.conson@unina2.it.
authors: Massimiliano
authors: M
authors: Conson
authors: Domenico
authors: D
authors: Errico
authors: Elisabetta
authors: E
authors: Mazzarella
authors: Francesco
authors: F
authors: De Bellis
authors: Dario
authors: D
authors: Grossi
authors: Luigi
authors: L
authors: Trojano
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006225:Hand; D006801:Humans; D007600:Judgment / Q000502:physiology*; D008297:Male; D011187:Posture; D011434:Proprioception; D011930:Reaction Time; D021641:Recognition, Psychology / Q000502:physiology*; D012649:Self Concept; D014110:Touch; D055815:Young Adult
references: Neuropsychologia. 1993 Nov;31(11):1191-200
references: 8107980
references: Percept Psychophys. 1982 Aug;32(2):89-95
references: 7145594
references: Exp Brain Res. 2011 Jul;212(1):153-60
references: 21553263
references: Brain Cogn. 2010 Aug;73(3):189-93
references: 20537784
references: Neuroimage. 2006 Nov 1;33(2):609-17
references: 16959501
references: Conscious Cogn. 2009 Mar;18(1):2-11
references: 18815056
references: Neuropsychologia. 2009 Jul;47(8-9):1988-93
references: 19428432
references: Cereb Cortex. 2007 Oct;17 (10 ):2235-44
references: 17138596
references: Neurosci Lett. 2004 Nov 3;370(1):19-24
references: 15489010
references: Exp Brain Res. 2013 May;226(3):313-23
references: 23423167
references: J Exp Psychol Hum Percept Perform. 1994 Aug;20(4):709-30
references: 8083630
references: Exp Brain Res. 2011 Nov;215(2):115-22
references: 21947174
references: Neuroreport. 2010 Feb 17;21(3):206-9
references: 20042898
references: Exp Brain Res. 2010 Oct;206(4):449-53
references: 20862462
references: Neurosci Biobehav Rev. 2008;32(3):598-610
references: 18160103
references: Front Hum Neurosci. 2013 Dec 24;7:915
references: 24399962
references: Exp Brain Res. 2006 Jan;168(1-2):307-11
references: 16311728
references: PLoS One. 2011;6(8):e23316
references: 21826247
references: J Neurosci. 2005 Nov 9;25(45):10564-73
references: 16280594
references: Exp Brain Res. 2007 Oct;183(1):1-7
references: 17643238
references: Cortex. 2010 Mar;46(3):322-8
references: 19482271
references: Curr Biol. 2010 Oct 26;20(20):1819-22
references: 20869246
references: J Cogn Neurosci. 2012 Jul;24(7):1584-95
references: 22452562
references: J Cogn Neurosci. 2008 Aug;20(8):1507-16
references: 18211238
references: Neurorehabil Neural Repair. 2013 Jul-Aug;27(6):497-506
references: 23401158
references: Exp Brain Res. 2011 May;211(1):73-85
references: 21533699
references: PLoS One. 2011 Mar 25;6(3):e17927
references: 21464959
references: J Exp Psychol Gen. 1987 Jun;116(2):172-91
references: 2955072
references: Exp Brain Res. 2009 May;195(2):207-17
references: 19326106