title: Neuroanatomical asymmetries and handedness in chimpanzees (Pan troglodytes): a case for continuity in the evolution of hemispheric specialization.
abstract: Many historical and contemporary theorists have proposed that population-level behavioral and brain asymmetries are unique to humans and evolved as a consequence of human-specific adaptations such as language, tool manufacture and use, and bipedalism. Recent studies in nonhuman animals, notably primates, have begun to challenge this view. Here, I summarize comparative data on neuroanatomical asymmetries in the planum temporale (PT) and inferior frontal gyrus (IFG) of humans and chimpanzees, regions considered the morphological equivalents to Broca's and Wernicke's areas. I also review evidence of population-level handedness in captive and wild chimpanzees. When similar methods and landmarks are used to define the PT and IFG, humans and chimpanzees show similar patterns of asymmetry in both cortical regions, though humans show more pronounced directional biases. Similarly, there is good evidence that chimpanzees show population-level handedness, though, again, the expression of handedness is less robust compared to humans. These results stand in contrast to reported claims of significant differences in the distribution of handedness in humans and chimpanzees, and I discuss some possible explanations for the discrepancies in the neuroanatomical and behavioral data.
authors: Neuroscience Institute and Language Research Center, Georgia State University, P.O. Box 5030, Atlanta, GA 30302, USA. whopkins4@gsu.edu
authors: William D
authors: WD
authors: Hopkins
mesh_terms: D000818:Animals; D001921:Brain / Q000033:anatomy & histology*; D007839:Functional Laterality; D002679:Pan troglodytes / Q000033:anatomy & histology / Q000502:physiology*
references: J Comp Neurol. 1980 Apr 1;190(3):597-610
references: 6771305
references: Nat Rev Neurosci. 2003 Jan;4(1):37-48
references: 12511860
references: Behav Brain Res. 2010 Apr 2;208(2):436-43
references: 20035802
references: Brain Res. 1992 Dec 11;598(1-2):143-53
references: 1486477
references: Behav Brain Res. 2006 Jul 15;171(1):170-4
references: 16621056
references: Arch Neurol. 1995 May;52(5):501-8
references: 7733846
references: Laterality. 2013;18(5):536-75
references: 23167450
references: Nature. 2004 Jan 29;427(6973):448-51
references: 14749833
references: J Anthropol Sci. 2008;86:7-35
references: 19934467
references: Dev Psychobiol. 2006 Sep;48(6):428-35
references: 16886179
references: Prog Brain Res. 2012;195:237-54
references: 22230630
references: Science. 1976 Apr 23;192(4237):387-9
references: 816005
references: Am J Phys Anthropol. 2012 Dec;149(4):591-8
references: 23129227
references: Neurology. 2001 Jul 24;57(2):207-15
references: 11468304
references: Behav Neurosci. 2004 Dec;118(6):1460-5
references: 15598157
references: Nat Neurosci. 2006 Aug;9(8):1064-70
references: 16862150
references: Cortex. 2007 May;43(4):499-510
references: 17623996
references: Neuropsychologia. 2002;40(9):1523-33
references: 11985833
references: Anim Cogn. 2003 Dec;6(4):213-23
references: 12898285
references: Laterality. 2004 Jan;9(1):35-51
references: 15382729
references: Brain Cogn. 2011 Mar;75(2):164-9
references: 21131120
references: Science. 1998 Jan 9;279(5348):220-2
references: 9422693
references: Eur J Neurosci. 1999 Sep;11(9):3033-46
references: 10510168
references: Behav Genet. 1994 May;24(3):217-27
references: 7945152
references: Proc Biol Sci. 2010 Jul 22;277(1691):2165-74
references: 20236975
references: J Comp Neurol. 1999 Sep 20;412(2):319-41
references: 10441759
references: Radiology. 2004 Jan;230(1):77-87
references: 14645885
references: Cortex. 2006 May;42(4):652-8
references: 16881273
references: Eur J Neurosci. 2009 Aug;30(3):431-8
references: 19614754
references: Neuropsychologia. 2001;39(10):1077-85
references: 11440760
references: Neuroimage. 2008 Aug 15;42(2):491-7
references: 18586523
references: Brain Behav Evol. 2001 Feb;57(2):98-105
references: 11435670
references: Eur J Neurol. 2000 Jan;7(1):35-46
references: 10809913
references: Brain Behav Evol. 2000 Dec;56(6):293-9
references: 11326134
references: PLoS One. 2008 Jun 25;3(6):e2529
references: 18575610
references: Nature. 2001 Nov 29;414(6863):505
references: 11734839
references: Laterality. 2009 May;14(3):217-27
references: 18759195
references: Neuroimage. 2002 Oct;17(2):670-9
references: 12377142
references: Brain Res Brain Res Rev. 1999 Jan;29(1):26-49
references: 9974150
references: Cereb Cortex. 2013 Feb;23(2):411-22
references: 22368087
references: Cereb Cortex. 2010 Mar;20(3):730-42
references: 19620620
references: J Neurosci. 2009 Nov 18;29(46):14607-16
references: 19923293
references: Brain Lang. 1997 Nov 15;60(2):255-322
references: 9344480
references: Am J Phys Anthropol. 2004 Jan;123(1):62-8
references: 14669237
references: Trends Cogn Sci. 2004 Feb;8(2):71-8
references: 15588811
references: Curr Biol. 2008 Mar 11;18(5):343-8
references: 18308569
references: Physiology (Bethesda). 2005 Feb;20:60-9
references: 15653841
references: Behav Brain Res. 2007 Dec 3;184(2):185-91
references: 17765336
references: Neuropsychologia. 1998 Dec;36(12):1265-73
references: 9863680
references: Primates. 2007 Jan;48(1):22-6
references: 17106789
references: Behav Brain Res. 2012 Sep 1;234(1):69-75
references: 22698705
references: J Hum Evol. 2010 Jul;59(1):54-69
references: 20537369
references: Dev Psychobiol. 2013 Sep;55(6):621-36
references: 23913784
references: Psychol Bull. 2006 Jul;132(4):538-59
references: 16822166
references: Laterality. 2006 Nov;11(6):508-24
references: 16966240
references: Anat Rec B New Anat. 2006 Jan;289(1):9-24
references: 16437554
references: Am J Med Genet B Neuropsychiatr Genet. 2006 Sep 5;141B(6):623-33
references: 16874762
references: Neuropsychologia. 2011 Jun;49(7):2004-12
references: 21447349
references: Brain Lang. 2009 Apr;109(1):29-48
references: 19155059
references: Am J Primatol. 2011 Mar;73(3):281-90
references: 20954250
references: Biol Res. 2003;36(1):89-99
references: 12795208
references: Brain Res Brain Res Rev. 2004 Jan;44(1):1-12
references: 14739000
references: Cereb Cortex. 2007 Mar;17(3):591-8
references: 16627859
references: Neuroimage. 2004;23 Suppl 1:S208-19
references: 15501092
references: Anat Rec A Discov Mol Cell Evol Biol. 2005 Nov;287(1):1128-41
references: 16215971
references: Am J Phys Anthropol. 2013 May;151(1):151-7
references: 23460350
references: Brain Lang. 2006 May;97(2):219-32
references: 16300824
references: J Comp Psychol. 2005 Feb;119(1):33-48
references: 15740428
references: J Hum Evol. 2011 May;60(5):605-11
references: 21334723
references: J Neurosci. 2009 Oct 28;29(43):13516-23
references: 19864564
references: Brain Res Cogn Brain Res. 2003 Dec;18(1):1-14
references: 14659492
references: Brain Lang. 2012 Oct;123(1):75-9
references: 22867751
references: Neuropsychologia. 2009 Jan;47(2):330-7
references: 18824185
references: J Hum Evol. 2009 Oct;57(4):411-9
references: 19758680
references: Am J Primatol. 2009 Jan;71(1):40-8
references: 18942096
references: PLoS One. 2010 Oct 13;5(10):e13383
references: 20967216
references: Cereb Cortex. 2009 May;19(5):1151-7
references: 18787228
references: Laterality. 2000 Jul;5(3):269-84
references: 15513147
references: Cortex. 1988 Sep;24(3):389-98
references: 3191723
references: Neuroreport. 1997 Apr 14;8(6):iii-xi
references: 9172127
references: Neuropsychologia. 1971 Mar;9(1):97-113
references: 5146491
references: Nature. 1999 Jun 17;399(6737):682-5
references: 10385119
references: Front Evol Neurosci. 2012 Jan 03;3:11
references: 22319495
references: Behav Neurosci. 2004 Jun;118(3):659-63
references: 15174946
references: Psychol Bull. 1991 Jan;109(1):76-89
references: 2006230
references: Annu Rev Neurosci. 2002;25:151-88
references: 12052907
references: Nat Rev Neurosci. 2010 Feb;11(2):139-45
references: 20046193
references: Cereb Cortex. 2004 Sep;14(9):945-51
references: 15115737
references: Neuropsychologia. 2003;41(14):1868-76
references: 14572520
references: Neuroreport. 1999 May 14;10(7):1453-9
references: 10380962
references: Am J Phys Anthropol. 1988 May;76(1):39-48
references: 3136655
references: Neuroimage. 2012 Jul 2;61(3):533-41
references: 22504765
references: Science. 1988 Dec 23;242(4886):1691-4
references: 3201258
references: J Comp Psychol. 2013 Nov;127(4):380-91
references: 23356440
references: Brain Res. 2008 Apr 24;1206:76-88
references: 18359009
references: Neuroimage. 2012 Oct 15;63(1):137-47
references: 22732561
references: Brain Res Cogn Brain Res. 2005 Sep;25(1):210-6
references: 15993042
references: Brain. 2000 Dec;123 Pt 12:2512-8
references: 11099452
references: Br J Psychiatry. 2001 Apr;178:344-51
references: 11282814