title: Memory for hand-use depends on consistency of handedness.
abstract: Individuals who do not consistently use the same hand to perform unimanual tasks (inconsistent-handed) outperform consistent right- and left-handed individuals on tests of episodic memory. We explored whether the inconsistent-hander (ICH) memory advantage extends to memory for unimanual hand use itself. Are ICHs better able to remember which hand they used to perform actions? Opposing predictions are possible, stemming from the finding that some regions of the corpus callosum are larger in ICHs, especially those that connect motor areas. One hypothesis is that greater callosally mediated interhemispheric interaction produces ICHs' superior retrieval of episodic memories, and this may extend to episodic memories for hand use. Alternatively, we also hypothesized that greater interhemispheric interaction could produce more bilateral activation in motor areas during the performance and retrieval of unimanual actions. This could interfere with ICHs' ability to remember which hand they used. To test these competing predictions in the current study, consistent- and inconsistent-handers performed unimanual actions, half of which required manipulating objects and half of which did not. Each action was performed four times in one of five conditions that differed in the ratio of left to right hand use: always left (4:0), usually left (3:1), equal (2:2), usually right (1:3), or always right (0:4). We compared consistent- and inconsistent-handers on recall of the left:right ratio for each action. ICHs remembered how they performed actions better than consistent-handers, regardless of ratio. These findings provide another example of superior episodic retrieval in ICHs. We discuss how greater interaction might benefit memory for hand use.
authors.affiliation: Department of Psychological and Brain Sciences, University of Louisville , Louisville, KY , USA.
authors.forename: James M
authors.initials: JM
authors.lastname: Edlin
authors.forename: Emily K
authors.initials: EK
authors.lastname: Carris
authors.forename: Keith B
authors.initials: KB
authors.lastname: Lyle
keywords: action memory; enactment; episodic memory; handedness; individual differences; interhemispheric interaction; self-performed tasks
references.citation: J Neurophysiol. 1999 Jan;81(1):383-7
references.pmid: 9914297
references.citation: Neuroimage. 2006 Sep;32(3):989-94
references.pmid: 16854598
references.citation: Psychon Bull Rev. 2008 Jun;15(3):515-20
references.pmid: 18567248
references.citation: Memory. 2004 Nov;12(6):707-14
references.pmid: 15724359
references.citation: J Exp Psychol Learn Mem Cogn. 2012 Jan;38(1):187-93
references.pmid: 21843021
references.citation: Laterality. 2011 Jan;16(1):35-74
references.pmid: 19657954
references.citation: Laterality. 2008 Sep;13(5):403-26
references.pmid: 18608851
references.citation: Front Psychol. 2013 Jan 31;4:9
references.pmid: 23386836
references.citation: Brain Cogn. 1998 Mar;36(2):128-57
references.pmid: 9520311
references.citation: Neuropsychol Rev. 2005 Jun;15(2):59-71
references.pmid: 16211466
references.citation: Proc Natl Acad Sci U S A. 1994 Mar 15;91(6):2016-20
references.pmid: 8134342
references.citation: Neuropsychology. 2006 Nov;20(6):700-7
references.pmid: 17100514
references.citation: Neuropsychologia. 2009 Oct;47(12):2427-35
references.pmid: 19383501
references.citation: Mem Cognit. 2005 Jun;33(4):751-7
references.pmid: 16248339
references.citation: Science. 1993 Jul 30;261(5121):615-7
references.pmid: 8342027
references.citation: Brain Cogn. 2010 Jul;73(2):128-34
references.pmid: 20452714
references.citation: Trends Cogn Sci. 1998 Oct 1;2(10):399-406
references.pmid: 21227255
references.citation: J Neurophysiol. 2011 Jan;105(1):88-99
references.pmid: 20943944
references.citation: Neuropsychology. 2008 Jul;22(4):523-530
references.pmid: 18590363
references.citation: Psychol Bull. 1993 Jul;114(1):3-28
references.pmid: 8346328
references.citation: Laterality. 2014;19(2):146-63
references.pmid: 23586369
references.citation: Am J Psychol. 2001 Summer;114(2):199-217
references.pmid: 11430149
references.citation: Memory. 2010 Aug;18(6):581-94
references.pmid: 20658433
references.citation: Brain Cogn. 2010 Jul;73(2):93-101
references.pmid: 20413200
references.citation: Neuroimage. 2001 Aug;14(2):521-8
references.pmid: 11467924
references.citation: J Cogn Neurosci. 2002 Jul 1;14(5):702-8
references.pmid: 12167255
references.citation: Neuropsychology. 2003 Apr;17(2):221-9
references.pmid: 12803427
references.citation: Exp Brain Res. 2008 Sep;190(3):317-28
references.pmid: 18592225
references.citation: Brain Cogn. 2004 Dec;56(3):313-9
references.pmid: 15522769
references.citation: Neuropsychology. 2001 Oct;15(4):607-16
references.pmid: 11761050
references.citation: Laterality. 2012;17(1):38-50
references.pmid: 21598173
references.citation: Neuropsychologia. 1971 Mar;9(1):97-113
references.pmid: 5146491
references.citation: Ann Neurol. 1983 May;13(5):536-40
references.pmid: 6870204
references.citation: Neuroimage. 2010 Aug 1;52(1):43-9
references.pmid: 20394828
references.citation: J Cogn Neurosci. 2004 May;16(4):621-36
references.pmid: 15165352
references.citation: Science. 1985 Aug 16;229(4714):665-8
references.pmid: 4023705
references.citation: Brain Cogn. 2011 Oct;77(1):17-22
references.pmid: 21807450
references.citation: Proc Natl Acad Sci U S A. 1997 Dec 9;94(25):14015-8
references.pmid: 9391144
references.citation: Brain Cogn. 1991 May;16(1):41-61
references.pmid: 1854469
references.citation: Brain Cogn. 2013 Apr;81(3):345-51
references.pmid: 23485024
references.citation: Neurology. 1993 Nov;43(11):2353-7
references.pmid: 8232955
references.citation: Brain Res. 2006 Jul 26;1101(1):102-9
references.pmid: 16782071
references.citation: Brain. 2000 Dec;123 Pt 12:2512-8
references.pmid: 11099452