W D Hopkins

Summary

Publications

  1. pmc A polymorphic indel containing the RS3 microsatellite in the 5' flanking region of the vasopressin V1a receptor gene is associated with chimpanzee (Pan troglodytes) personality
    W D Hopkins
    Neuroscience Institute and Language Research Center, Georgia State University, Atlanta, 30302, USA
    Genes Brain Behav 11:552-8. 2012
  2. pmc A voxel-based morphometry analysis of white matter asymmetries in chimpanzees (Pan troglodytes)
    William D Hopkins
    Department of Psychology, Agnes Scott College, Decatur, GA 30030, USA
    Brain Behav Evol 76:93-100. 2010
  3. pmc Observer-independent characterization of sulcal landmarks and depth asymmetry in the central sulcus of the chimpanzee brain
    W D Hopkins
    Department of Psychology, Agnes Scott College, Decatur, GA 30030, USA
    Neuroscience 171:544-51. 2010
  4. doi request reprint Cross-sectional analysis of the association between age and corpus callosum size in chimpanzees (Pan troglodytes)
    William D Hopkins
    Department of Psychology Agnes Scott College Decatur, GA 30030, USA
    Dev Psychobiol 52:133-41. 2010
  5. pmc Planum temporale surface area and grey matter asymmetries in chimpanzees (Pan troglodytes): the effect of handedness and comparison with findings in humans
    William D Hopkins
    Department of Psychology, Agnes Scott College, Decatur, GA 30030, USA
    Behav Brain Res 208:436-43. 2010
  6. pmc Brief communication: Locomotor limb preferences in captive chimpanzees (Pan troglodytes): implications for morphological asymmetries in limb bones
    William D Hopkins
    Department of Psychology, Agnes Scott College, Decatur, GA 30030, USA
    Am J Phys Anthropol 137:113-8. 2008
  7. pmc Volumetric and lateralized differences in selected brain regions of chimpanzees (Pan troglodytes) and bonobos (Pan paniscus)
    William D Hopkins
    Department of Psychology, Agnes Scott College, 141 E College Avenue, Decatur, GA 30030, USA
    Am J Primatol 71:988-97. 2009
  8. pmc Hand preferences for coordinated bimanual actions in 777 great apes: implications for the evolution of handedness in hominins
    William D Hopkins
    Department of Psychology, Agnes Scott College, 141 E College Avenue, Decatur, GA 30030, USA
    J Hum Evol 60:605-11. 2011
  9. pmc Intentional communication by chimpanzees: a cross-sectional study of the use of referential gestures
    D A Leavens
    Department of Psychology, University of Georgia, Athens 30602, USA
    Dev Psychol 34:813-22. 1998
  10. pmc Lateralized changes in tympanic membrane temperature in relation to different cognitive tasks in chimpanzees (Pan troglodytes)
    W D Hopkins
    Division of Psychobiology, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia 30322, USA
    Behav Neurosci 112:83-8. 1998

Collaborators

Detail Information

Publications73

  1. pmc A polymorphic indel containing the RS3 microsatellite in the 5' flanking region of the vasopressin V1a receptor gene is associated with chimpanzee (Pan troglodytes) personality
    W D Hopkins
    Neuroscience Institute and Language Research Center, Georgia State University, Atlanta, 30302, USA
    Genes Brain Behav 11:552-8. 2012
    ..These findings are the first evidence showing that the AVPR1A gene plays a role in different aspects of personality in male and female chimpanzees...
  2. pmc A voxel-based morphometry analysis of white matter asymmetries in chimpanzees (Pan troglodytes)
    William D Hopkins
    Department of Psychology, Agnes Scott College, Decatur, GA 30030, USA
    Brain Behav Evol 76:93-100. 2010
    ..Several of the asymmetries were found in regions corresponding to well-known white matter tracts including the superior longitudinal fasciculus, inferior longitudinal fasciculus and corticospinal tract...
  3. pmc Observer-independent characterization of sulcal landmarks and depth asymmetry in the central sulcus of the chimpanzee brain
    W D Hopkins
    Department of Psychology, Agnes Scott College, Decatur, GA 30030, USA
    Neuroscience 171:544-51. 2010
    ..The methods employed here offer some potential advantages over traditional region-of-interest in the comparative study of cortical organization and gyrification in primates and are discussed...
  4. doi request reprint Cross-sectional analysis of the association between age and corpus callosum size in chimpanzees (Pan troglodytes)
    William D Hopkins
    Department of Psychology Agnes Scott College Decatur, GA 30030, USA
    Dev Psychobiol 52:133-41. 2010
    ..As the growth curves of the CC mirrors growth seen in the percentage of white matter in humans, our results suggest chimpanzees show continued white matter development in regions related to cognitive development...
  5. pmc Planum temporale surface area and grey matter asymmetries in chimpanzees (Pan troglodytes): the effect of handedness and comparison with findings in humans
    William D Hopkins
    Department of Psychology, Agnes Scott College, Decatur, GA 30030, USA
    Behav Brain Res 208:436-43. 2010
    ..These results suggest that leftward asymmetries in the PT were present in the common ancestor of chimpanzees and humans...
  6. pmc Brief communication: Locomotor limb preferences in captive chimpanzees (Pan troglodytes): implications for morphological asymmetries in limb bones
    William D Hopkins
    Department of Psychology, Agnes Scott College, Decatur, GA 30030, USA
    Am J Phys Anthropol 137:113-8. 2008
    ..The results are consistent with previous behavioral studies in captive chimpanzees as well as studies on skeletal asymmetries of the forelimbs of chimpanzees...
  7. pmc Volumetric and lateralized differences in selected brain regions of chimpanzees (Pan troglodytes) and bonobos (Pan paniscus)
    William D Hopkins
    Department of Psychology, Agnes Scott College, 141 E College Avenue, Decatur, GA 30030, USA
    Am J Primatol 71:988-97. 2009
    ..The results suggest that the two species of Pan are quite similar neurologically, though some volumetric and lateralized differences may reflect inherent differences in social organization, cognition and motor skills...
  8. pmc Hand preferences for coordinated bimanual actions in 777 great apes: implications for the evolution of handedness in hominins
    William D Hopkins
    Department of Psychology, Agnes Scott College, 141 E College Avenue, Decatur, GA 30030, USA
    J Hum Evol 60:605-11. 2011
    ....
  9. pmc Intentional communication by chimpanzees: a cross-sectional study of the use of referential gestures
    D A Leavens
    Department of Psychology, University of Georgia, Athens 30602, USA
    Dev Psychol 34:813-22. 1998
    ..Significantly fewer mother-reared chimpanzees exhibited gaze alternation compared with nursery-reared chimpanzees...
  10. pmc Lateralized changes in tympanic membrane temperature in relation to different cognitive tasks in chimpanzees (Pan troglodytes)
    W D Hopkins
    Division of Psychobiology, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia 30322, USA
    Behav Neurosci 112:83-8. 1998
    ....
  11. pmc Birth order and hand preference in chimpanzees (Pan troglodytes): implications for pathological models of handedness in humans
    W D Hopkins
    Department of Psychology, Berry College, USA
    J Comp Psychol 114:302-6. 2000
    ..These data suggest that biological rather than sociological factors play a greater role in explaining the observed birth-order effects on hand preference in humans...
  12. pmc The whole-hand point: the structure and function of pointing from a comparative perspective
    D A Leavens
    Department of Psychology, University of Georgia and Living Links Center, Athens 30602, USA
    J Comp Psychol 113:417-25. 1999
    ..Captive apes exhibit relatively more gaze alternation while pointing than do human infants about 1 year old. Human infants are relatively more vocal while pointing than are captive apes, consistent with paralinguistic use of pointing...
  13. pmc A comparative MRI study of the relationship between neuroanatomical asymmetry and interhemispheric connectivity in primates: implication for the evolution of functional asymmetries
    W D Hopkins
    Department of Psychology, Berry College, USA
    Behav Neurosci 114:739-48. 2000
    ..Taken together, these results support the hypothesis that leftward brain asymmetries may have evolved as a consequence of reduced interhemispheric connectivity...
  14. pmc Asymmetric Broca's area in great apes
    C Cantalupo
    Division of Psychobiology and Living Links Center, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia 30322, USA
    Nature 414:505. 2001
    ..Our findings suggest that the neuroanatomical substrates for left-hemisphere dominance in speech production were evident at least five million years ago and are not unique to hominid evolution...
  15. pmc Neuroanatomical localization of the motor hand area with magnetic resonance imaging: the left hemisphere is larger in great apes
    W D Hopkins
    Department of Psychology, Berry College Regional Primate Research Center, USA
    Behav Neurosci 115:1159-64. 2001
    ..Selection for the evolution of a neuroanatomical representation of the hand in primates and an evolutionary trend toward population-level right handedness are discussed...
  16. pmc Chimpanzee (Pan troglodytes) handedness: variability across multiple measures of hand use
    W D Hopkins
    Department of Psychology, Berry College, USA
    J Comp Psychol 114:126-35. 2000
    ..The results are interpreted in the context of several recent studies that proposed theoretical models of handedness in nonhuman primates...
  17. ncbi request reprint Haptic discrimination in capuchin monkeys (Cebus apella): evidence of manual specialization
    L A Parr
    Division of Psychobiology, Yerkes Regional Primate Research Center, Atlanta, GA 30329, USA
    Neuropsychologia 35:143-52. 1997
    ..This is consistent with what is known about right hemisphere superiority for haptic discrimination in humans...
  18. pmc Subgenual cingulate cortex and personality in chimpanzees (Pan troglodytes)
    Barbara J Blatchley
    Department of Psychology, Agnes Scott College, Decatur, Georgia 30030, USA
    Cogn Affect Behav Neurosci 10:414-21. 2010
    ..There was also a population-level leftward asymmetry in the SGCC. These results are discussed in terms of current models of SGCC function, which suggest that this area may play a role in the biological foundation of personality...
  19. pmc The Association between handedness, brain asymmetries, and corpus callosum size in chimpanzees (Pan troglodytes)
    William D Hopkins
    Department of Psychology, Agnes Scott College, Decatur, GA 30030, USA
    Cereb Cortex 17:1757-65. 2007
    ....
  20. ncbi request reprint Birth order and left-handedness revisited: some recent findings in chimpanzees (Pan troglodytes) and their implications for developmental and evolutionary models of human handedness
    W D Hopkins
    Department of Psychology, Berry College, PO Box 455019, Mount Berry, GA 30149 5019, USA
    Neuropsychologia 38:1626-33. 2000
    ..Possible prenatal hormonal and periparturitional factors are discussed as possible mechanisms for the observed findings...
  21. pmc Heritability of hand preference in chimpanzees (Pan troglodytes): evidence from a partial interspecies cross-fostering study
    W D Hopkins
    Department of Psychology, Berry College, USA
    J Comp Psychol 113:307-13. 1999
    ..Several environmental explanations are proposed to explain the findings, including the potential role of maternal cradling bias and in utero fetal position...
  22. ncbi request reprint The effect of situational factors on hand preferences for feeding in 177 captive chimpanzees (Pan troglodytes)
    W D Hopkins
    Department of Psychology, Berry College, PO Box 495019, Mount Berry, GA 30149 5019, USA
    Neuropsychologia 38:403-9. 2000
    ..Taken together, the data suggest that chimpanzee hand preferences for feeding are not constrained by situational factors and are relatively consistent in biased and unbiased testing conditions...
  23. pmc Exploring the relationship between cerebellar asymmetry and handedness in chimpanzees (Pan troglodytes) and capuchins (Cebus apella)
    Kimberley A Phillips
    Department of Psychology, Hiram College, 11715 Garfield Road, Hiram, OH 44234, USA
    Neuropsychologia 45:2333-9. 2007
    ..Cerebellar asymmetries were significantly associated with handedness in capuchins but not chimpanzees, and this effect was most pronounced in right-handed capuchins...
  24. doi request reprint Termite fishing laterality in the Fongoli savanna chimpanzees (Pan troglodytes verus): further evidence of a left hand preference
    S L Bogart
    Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center, Atlanta, GA 30322, USA
    Am J Phys Anthropol 149:591-8. 2012
    ..When the data were combined across all studies, wild chimpanzees showed a population-level left hand preference for termite fishing...
  25. pmc Sylvian fissure asymmetries in nonhuman primates revisited: a comparative mri study
    W D Hopkins
    Division of Psychobiology, Yerkes Regional Primate Research Center, Emory University, Atlanta, GA 30322, USA
    Brain Behav Evol 56:293-9. 2000
    ..These results are consistent with findings reported in apes and, to a lesser extent, monkeys. MRI has excellent potential for comparing neuroanatomy across taxonomic families that will help future investigations...
  26. pmc Effects of cognitive challenge on self-directed behaviors by chimpanzees (Pan troglodytes)
    D A Leavens
    Department of Psychology, University of Georgia, Athens, Georgia, USA
    Am J Primatol 55:1-14. 2001
    ..Taken together, these results extend previous research on SDBs to the domain of cognitive stress in nonsocial contexts, demonstrating that SDBs are sensitive to manipulations of task difficulty in chimpanzees...
  27. pmc Differential use of vocal and gestural communication by chimpanzees (Pan troglodytes) in response to the attentional status of a human (Homo sapiens)
    A B Hostetter
    Department of Psychology, Berry College, USA
    J Comp Psychol 115:337-43. 2001
    ..These results replicate the findings of earlier studies on chimpanzee gestural communication and provide new information about the intentional and functional use of their vocalizations...
  28. ncbi request reprint Asymmetries in cerebral width in nonhuman primate brains as revealed by magnetic resonance imaging (MRI)
    W D Hopkins
    Department of Psychology, Berry College, Mount Berry, GA 30149, USA
    Neuropsychologia 38:493-9. 2000
    ..The results in the great apes are consistent with previous reports of petalia asymmetries and suggest that the use of MRI is a valid approach to the assessment of neuroanatomical asymmetries in primates...
  29. ncbi request reprint Brain temperature asymmetries and emotional perception in chimpanzees, Pan troglodytes
    L A Parr
    Department of Psychology, Emory University, 30322, Atlanta, GA, USA
    Physiol Behav 71:363-71. 2000
    ....
  30. pmc Genetic influence on the expression of hand preferences in chimpanzees (Pan troglodytes): evidence in support of the right-shift theory and developmental instability
    W D Hopkins
    Department of Psychology, Berry College, Atlanta, GA, USA
    Psychol Sci 12:299-303. 2001
    ..The data are interpreted to reconcile both genetic models for handedness and hypotheses suggesting that developmental instability influences variation in handedness...
  31. doi request reprint The impact of environment on the comprehension of declarative communication in apes
    Heidi Lyn
    Department of Psychology, Agnes Scott College, 141 E College Ave, Decatur, GA 30030, USA
    Psychol Sci 21:360-5. 2010
    ....
  32. ncbi request reprint Referential communication by chimpanzees (Pan troglodytes)
    David A Leavens
    Department of Psychology, University of Georgia, Atlanta, GA, USA
    J Comp Psychol 118:48-57. 2004
    ..The capacity for nonverbal reference may predate the Hominidae-Pongidae split, and the development of nonverbal reference may be independent of human species-specific adaptations for speech...
  33. ncbi request reprint Automation of learning-set testing: the video-task paradigm
    D A Washburn
    Georgia State University, Atlanta, USA
    Behav Res Methods Instrum Comput 21:281-4. 1989
    ..Additionally, the efficient learning and rich data that were characteristic of this study suggest several advantages of the present testing paradigm over traditional WGTA testing...
  34. pmc The use of bouts and frequencies in the evaluation of hand preferences for a coordinated bimanual task in chimpanzees (Pan troglodytes): an empirical study comparing two different indices of laterality
    W D Hopkins
    Department of Psychology, Berry College, USA
    J Comp Psychol 115:294-9. 2001
    ..The results further suggest that hand preferences for coordinated bimanual actions are not influenced by situational factors and may reflect an inherent specialization of the left hemisphere for motor skill...
  35. pmc Now you see me, now you don't: evidence that chimpanzees understand the role of the eyes in attention
    Autumn B Hostetter
    Department of Psychology, University of Wisconsin Madison, 1202 W Johnson Street, Madison, WI 53706, USA
    Anim Cogn 10:55-62. 2007
    ..There was no effect of age or rearing history. The results suggest that chimpanzees use the presence of the eyes as a cue that their visual gestures will be effective...
  36. pmc Does variation in sample size explain individual differences in hand preferences of chimpanzees (Pan troglodytes)? An empirical study and reply to Palmer (2002)
    William D Hopkins
    Department of Psychology, Berry College, Mount Berry, Georgia 30149, USA
    Am J Phys Anthropol 121:378-81;author reply 382-4. 2003
  37. ncbi request reprint Functional asymmetry of emotions in primates: new findings in chimpanzees
    Samuel Fernandez-Carriba
    Language Research Center, Georgia State University, Decatur, GA 30034, USA
    Brain Res Bull 57:561-4. 2002
    ..01). Thus, chimpanzees, like humans and some other non-human primates, show a right hemisphere specialization for facial expression of emotions, which suggests that this functional asymmetry is homologous in all these species...
  38. pmc Comparative and familial analysis of handedness in great apes
    William D Hopkins
    Department of Psychology, Berry College and Yerkes National Primate Research Center, Atlanta, GA 30322, USA
    Psychol Bull 132:538-59. 2006
    ..Overall, the proportion of right handedness is lower in great apes compared with humans, and various methodological and theoretical explanations for this discrepancy are discussed...
  39. pmc Gray matter asymmetries in chimpanzees as revealed by voxel-based morphometry
    William D Hopkins
    Department of Psychology, Agnes Scott College, Decatur, Georgia 30030, USA
    Neuroimage 42:491-7. 2008
    ..The results from this VBM analysis support previous reports of hemispheric lateralization in chimpanzees and reinforce the view that asymmetries in the central nervous system are not uniquely human...
  40. pmc Matching visual stimuli on the basis of global and local features by chimpanzees (Pan troglodytes) and rhesus monkeys (Macaca mulatta)
    William D Hopkins
    Department of Psychology, Berry College, Mount Berry, GA 30149, USA
    Anim Cogn 5:27-31. 2002
    ..The results suggest that perceptual and attentional mechanisms underlying information-processing strategies may account for differences in learning by primates...
  41. doi request reprint The chimpanzee brain shows human-like perisylvian asymmetries in white matter
    Claudio Cantalupo
    Department of Psychology, Clemson University, Clemson, SC 29634, USA
    Eur J Neurosci 30:431-8. 2009
    ....
  42. pmc Communicative signaling activates 'Broca's' homolog in chimpanzees
    Jared P Taglialatela
    Yerkes National Primate Research Center, Atlanta, Georgia 30329 Department of Natural Sciences, Clayton State University, Morrow, Georgia 30260, USA
    Curr Biol 18:343-8. 2008
    ....
  43. pmc Left hemisphere specialization for oro-facial movements of learned vocal signals by captive chimpanzees
    Elizabeth A Reynolds Losin
    Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, Georgia, United States of America
    PLoS ONE 3:e2529. 2008
    ....
  44. pmc Neuroanatomical correlates of handedness for tool use in chimpanzees (Pan troglodytes): implication for theories on the evolution of language
    William D Hopkins
    Division of Psychobiology, Yerkes National Primate Research Center, Emory University, Atlanta, GA 30322, USA
    Psychol Sci 18:971-7. 2007
    ..These results suggest that the neural substrates of tool use may have served as a preadaptation for the evolution of language and speech in modern humans...
  45. pmc Tauopathy with paired helical filaments in an aged chimpanzee
    Rebecca F Rosen
    Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30329, USA
    J Comp Neurol 509:259-70. 2008
    ....
  46. pmc Sex differences in asymmetry of the planum parietale in chimpanzees (Pan troglodytes)
    Jared P Taglialatela
    Division of Psychobiology, Yerkes National Primate Research Center, Emory University, 954 Gatewood Road, Atlanta, GA 30329, USA
    Behav Brain Res 184:185-91. 2007
    ..These results support the view that asymmetries in the perisylvian language areas were present in the common ancestor of humans and chimpanzees...
  47. pmc Further evidence of an association between handedness and neuroanatomical asymmetries in the primary motor cortex of chimpanzees (Pan troglodytes)
    Marco Dadda
    Department of General Psychology, University of Padova, Via Venezia 8, 35131 Padova, Italy
    Neuropsychologia 44:2582-6. 2006
    ..Moreover, using a continuous scale of measurement rather than discrete classification of handedness, significant associations were found between hand use and asymmetries within the precentral gyrus...
  48. pmc Behavioral and neuroanatomical correlates of white matter asymmetries in chimpanzees (Pan troglodytes)
    William D Hopkins
    Division of Psychobiology, Yerkes National Primate Research Center, Emory University, Atlanta, GA 30322, USA
    Eur J Neurosci 25:2565-70. 2007
    ..These findings suggest that chimpanzees show asymmetries in cortical connectivity and these may serve as the foundation for morphological and behavioral laterality in primates, including humans...
  49. pmc A cross-setting study of chimpanzee (Pan troglodytes) personality structure and development: zoological parks and Yerkes National Primate Research Center
    Alexander Weiss
    Department of Psychology, The University of Edinburgh, Edinburgh, UK
    Am J Primatol 69:1264-77. 2007
    ..These findings suggest that, whereas there may be differences in the ease with which ratings are made, personality structure, and development are largely consistent across widely differing settings...
  50. pmc Histological asymmetries of primary motor cortex predict handedness in chimpanzees (Pan troglodytes)
    Chet C Sherwood
    Department of Anthropology, The George Washington University, 2110 G Street NW, Washington, DC 20052, USA
    J Comp Neurol 503:525-37. 2007
    ..These results suggest that histological asymmetries are related to handedness in chimpanzees, while overall patterns of asymmetry at the population level might differ from humans...
  51. pmc Lateralized scratching in chimpanzees (Pan troglodytes): Evidence of a functional asymmetry during arousal
    William D Hopkins
    Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, GA 30322, USA
    Emotion 6:553-9. 2006
    ..For scratching, the chimpanzees showed no hand preference but a significant bias for scratching on the left side of the body. These results support the view that the right hemisphere regulates the autonomic nervous system during arousal...
  52. pmc Sex and handedness effects on corpus callosum morphology in chimpanzees (Pan troglodytes)
    Leslie A Dunham
    Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, GA 30322, USA
    Behav Neurosci 120:1025-32. 2006
    ..The results indicate that lateralized hand use in chimpanzees, as in humans, is associated with variation in CC size...
  53. pmc Individual and setting differences in the hand preferences of chimpanzees (Pan troglodytes): a critical analysis and some alternative explanations
    William D Hopkins
    Berry College, Mount Berry, GA, USA
    Laterality 10:65-80. 2005
    ....
  54. pmc Grip preference, dermatoglyphics, and hand use in captive chimpanzees (Pan troglodytes)
    William D Hopkins
    Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, Georgia 30322, USA
    Am J Phys Anthropol 128:57-62. 2005
    ..The results suggest that fingerprint patterns are associated with individual differences in grasping type in chimpanzees as well as some variation in hand use...
  55. pmc Chimpanzee (Pan troglodytes) intentional communication is not contingent upon food
    Jamie L Russell
    Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, GA 30322, USA
    Anim Cogn 8:263-72. 2005
    ..Implications for the referential and intentional nature of chimpanzee communicative signaling are discussed...
  56. pmc Intentionality as measured in the persistence and elaboration of communication by chimpanzees (Pan troglodytes)
    David A Leavens
    Psychology Department, University of Sussex, Falmer, East Sussex, UK
    Child Dev 76:291-306. 2005
    ..Thus, their communication was about a specific item, demonstrating that both intentionality and nonverbal reference are capacities shared by humans with our nearest living relatives, the great apes...
  57. pmc Asymmetries in the hippocampus and amygdala of chimpanzees (Pan troglodytes)
    Hani D Freeman
    Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, GA 30322, USA
    Behav Neurosci 118:1460-5. 2004
    ..Several of these findings are consistent with results found in the human literature...
  58. pmc Handedness in chimpanzees (Pan troglodytes) is associated with asymmetries of the primary motor cortex but not with homologous language areas
    William D Hopkins
    Division of Psychobiology, Yerkes National Primate Research Center, Emory University, Atlanta, GA 30322, USA
    Behav Neurosci 118:1176-83. 2004
    ..The overall results suggest that homologous regions of the motor cortex control hand preferences in humans and apes and that these functions evolved independently of left-hemisphere specialization for language and speech...
  59. ncbi request reprint Human assessment of chimpanzee facial asymmetry
    Samuel Fernandez-Carriba
    Emory Autism Center, 1551 Shoup Court, Emory University Atlanta, GA 30322, USA
    Laterality 9:1-17. 2004
    ....
  60. pmc Chimpanzees (Pan troglodytes) are predominantly right-handed: replication in three populations of apes
    William D Hopkins
    Division of Psychobiology, Emory University, Yerkes National Primate Research Center, 954 Gatewood Road, Atlanta, GA 30322, USA
    Behav Neurosci 118:659-63. 2004
    ..This is the strongest evidence to date that population-level handedness is evident in chimpanzees and is not an artifact of human rearing...
  61. ncbi request reprint Further evidence of a right hand advantage in motor skill by chimpanzees (Pan troglodytes)
    William D Hopkins
    Division of Psychobiology, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30322, USA
    Neuropsychologia 42:990-6. 2004
    ..These results are discussed in the context of a presumed disassociation between hand preference and performance as indicators of cerebral dominance in motor functions...
  62. pmc Grip morphology and hand use in chimpanzees (Pan troglodytes): evidence of a left hemisphere specialization in motor skill
    William D Hopkins
    Division of Psychobiology, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia 30322, USA
    J Exp Psychol Gen 131:412-23. 2002
    ..Significantly more errors were made for the left compared with the right hand. The cumulative results indicate that chimpanzees show a left-hemisphere asymmetry in motor skill that is associated with the use of precision grips...
  63. pmc The distribution and development of handedness for manual gestures in captive chimpanzees (Pan troglodytes)
    William D Hopkins
    Division of Psychobiology, Yerkes National Primate Research Center, Emory University, Atlanta, GA 30322, USA
    Psychol Sci 16:487-93. 2005
    ....
  64. pmc Handedness is associated with asymmetries in gyrification of the cerebral cortex of chimpanzees
    William D Hopkins
    Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, GA 30322, USA
    Cereb Cortex 17:1750-6. 2007
    ..The results indicate that variation in gyrification between hemispheres is associated with functional measures of laterality in chimpanzees...
  65. ncbi request reprint Asymmetry in facial expression of emotions by chimpanzees
    Samuel Fernandez-Carriba
    Language Research Center, Georgia State University, Atlanta, GA 30034, USA
    Neuropsychologia 40:1523-33. 2002
    ..No effect of expression type (positive versus negative) on facial asymmetry was found. Thus, chimpanzees, like humans and some other nonhuman primates, show a right hemisphere specialization for facial expression of emotions...
  66. pmc Parental and perinatal factors influencing the development of handedness in captive chimpanzees
    William D Hopkins
    Division of Psychobiology, Yerkes National Primate Research Center, 954 Gatewood Road, Atlanta, Georgia 30322, USA
    Dev Psychobiol 48:428-35. 2006
    ..Contrary to many theories of the origin of handedness, these results indicate that genetic factors have a significant influence on handedness in chimpanzees...
  67. pmc Chimpanzees are right-handed when recording bouts of hand use
    William D Hopkins
    Yerkes National Primate Research Center, Atlanta Berry College, Mount Berry, GA, USA
    Laterality 10:121-130. 2005
    ..These results indicate that chimpanzees are right-handed, even when using a more conservative measure of handedness. Limitations in the use of bouts in handedness assessment are also discussed...
  68. pmc Gesture handedness predicts asymmetry in the chimpanzee inferior frontal gyrus
    Jared P Taglialatela
    Division of Psychobiology, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia 30329, USA
    Neuroreport 17:923-7. 2006
    ..These findings are the first to provide a direct link between neuroanatomical asymmetries and the production of lateralized communicative behavior in non-human primates...
  69. pmc Chimpanzee right-handedness: internal and external validity in the assessment of hand use
    William D Hopkins
    Division of Psychobiology, Yerkes Regional Primate Research Center, Emory University, Atlanta, GA 30322, USA
    Cortex 42:90-3. 2006
  70. pmc Factors influencing the prevalence and handedness for throwing in captive chimpanzees (Pan troglodytes)
    William D Hopkins
    Yerkes National Primate Research Center, Emory University, Atlanta, GA 30322, USA
    J Comp Psychol 119:363-70. 2005
    ..The implications of these findings are discussed in the context of theories relating throwing to the evolution of lateralization for language functions...
  71. pmc Maternal age, parity, and reproductive outcome in captive chimpanzees (Pan troglodytes)
    Katherine A Roof
    Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, Georgia 30322, USA
    Am J Primatol 67:199-207. 2005
    ..This study supports research demonstrating reproductive decline and termination in nonhuman primates, and is the first to quantitatively account for this phenomenon in captive female chimpanzees...
  72. pmc Wild chimpanzees show population-level handedness for tool use
    Elizabeth V Lonsdorf
    Department of Conservation and Science, Lincoln Park Zoo, Chicago, IL 60614, USA
    Proc Natl Acad Sci U S A 102:12634-8. 2005
    ....
  73. pmc Comparative assessment of handedness for a coordinated bimanual task in chimpanzees (Pan troglodytes), gorillas (Gorilla gorilla) and orangutans (Pongo pygmaeus)
    William D Hopkins
    Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, GA 30322, USA
    J Comp Psychol 117:302-8. 2003
    ..The gorillas showed a nonsignificant trend toward right-handedness. The results are discussed in terms of possible ecological or biomechanical factors that may influence hand preferences in different ape species...