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Nelson J, Woeste EM, Oba K, Bitterman K, Billings BK, Sacco J, Jacobs B, Sherwood CC, Manger PR, Spocter MA. Neuropil Variation in the Prefrontal, Motor, and Visual Cortex of Six Felids. BRAIN, BEHAVIOR AND EVOLUTION 2024; 99:25-44. [PMID: 38354714 DOI: 10.1159/000537843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 02/04/2024] [Indexed: 02/16/2024]
Abstract
INTRODUCTION Felids have evolved a specialized suite of morphological adaptations for obligate carnivory. Although the musculoskeletal anatomy of the Felidae has been studied extensively, the comparative neuroanatomy of felids is relatively unexplored. Little is known about how variation in the cerebral anatomy of felids relates to species-specific differences in sociality, hunting strategy, or activity patterns. METHODS We quantitatively analyzed neuropil variation in the prefrontal, primary motor, and primary visual cortices of six species of Felidae (Panthera leo, Panthera uncia, Panthera tigris, Panthera leopardus, Acinonyx jubatus, Felis sylvestris domesticus) to investigate relationships with brain size, neuronal cell parameters, and select behavioral and ecological factors. Neuropil is the dense, intricate network of axons, dendrites, and synapses in the brain, playing a critical role in information processing and communication between neurons. RESULTS There were significant species and regional differences in neuropil proportions, with African lion, cheetah, and tiger having more neuropil in all three cortical regions in comparison to the other species. Based on regression analyses, we find that the increased neuropil fraction in the prefrontal cortex supports social and behavioral flexibility, while in the primary motor cortex, this facilitates the neural activity needed for hunting movements. Greater neuropil fraction in the primary visual cortex may contribute to visual requirements associated with diel activity patterns. CONCLUSION These results provide a cross-species comparison of neuropil fraction variation in the Felidae, particularly the understudied Panthera, and provide evidence for convergence of the neuroanatomy of Panthera and cheetahs.
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Affiliation(s)
- Jacob Nelson
- Department of Anatomy, Des Moines University, West Des Moines, Iowa, USA
| | - Erin M Woeste
- Department of Anatomy, Des Moines University, West Des Moines, Iowa, USA
| | - Ken Oba
- Department of Anatomy, Des Moines University, West Des Moines, Iowa, USA
| | - Kathleen Bitterman
- Department of Anatomy, Des Moines University, West Des Moines, Iowa, USA
| | - Brendon K Billings
- School of Anatomical Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - James Sacco
- Ellis Pharmacogenomics Laboratory, College of Pharmacy and Health Sciences, Drake University, Des Moines, Iowa, USA
| | - Bob Jacobs
- Department of Psychology, Laboratory of Quantitative Neuromorphology, Neuroscience Program, Colorado College, Colorado Springs, Colorado, USA
| | - Chet C Sherwood
- Department of Anthropology and Center for the Advanced Study of Human Paleobiology, The George Washington University, Washington, District of Columbia, USA
| | - Paul R Manger
- School of Anatomical Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Muhammad A Spocter
- Department of Anatomy, Des Moines University, West Des Moines, Iowa, USA
- School of Anatomical Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
- Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA
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Tian Y, Yin J, Wang C, He Z, Xie J, Feng X, Zhou Y, Ma T, Xie Y, Li X, Yang T, Ren C, Li C, Zhao Z. An Ultraflexible Electrode Array for Large-Scale Chronic Recording in the Nonhuman Primate Brain. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2302333. [PMID: 37870175 PMCID: PMC10667845 DOI: 10.1002/advs.202302333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 09/08/2023] [Indexed: 10/24/2023]
Abstract
Single-unit (SU) recording in nonhuman primates (NHPs) is indispensible in the quest of how the brain works, yet electrodes currently used for the NHP brain are limited in signal longevity, stability, and spatial coverage. Using new structural materials, microfabrication, and penetration techniques, we develop a mechanically robust ultraflexible, 1 µm thin electrode array (MERF) that enables pial penetration and high-density, large-scale, and chronic recording of neurons along both vertical and horizontal cortical axes in the nonhuman primate brain. Recording from three monkeys yields 2,913 SUs from 1,065 functional recording channels (up to 240 days), with some SUs tracked for up to 2 months. Recording from the primary visual cortex (V1) reveals that neurons with similar orientation preferences for visual stimuli exhibited higher spike correlation. Furthermore, simultaneously recorded neurons in different cortical layers of the primary motor cortex (M1) show preferential firing for hand movements of different directions. Finally, it is shown that a linear decoder trained with neuronal spiking activity across M1 layers during monkey's hand movements can be used to achieve on-line control of cursor movement. Thus, the MERF electrode array offers a new tool for basic neuroscience studies and brain-machine interface (BMI) applications in the primate brain.
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Affiliation(s)
- Yixin Tian
- Institute of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
| | - Jiapeng Yin
- Shanghai Center for Brain Science and Brain‐Inspired TechnologyShanghai201602China
- Lingang LaboratoryShanghai200031China
| | - Chengyao Wang
- Institute of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
| | - Zhenliang He
- Lingang LaboratoryShanghai200031China
- Institute of NeuroscienceState Key Laboratory of Neuroscience, Center for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
| | - Jingyi Xie
- Institute of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
- University of Chinese Academy of SciencesBeijing100049China
| | - Xiaoshan Feng
- Institute of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
| | - Yang Zhou
- Institute of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
| | - Tianyu Ma
- Institute of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
- University of Chinese Academy of SciencesBeijing100049China
| | - Yang Xie
- Lingang LaboratoryShanghai200031China
- Institute of NeuroscienceKey Laboratory of Primate Neurobiology, Center for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
| | - Xue Li
- Institute of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
| | - Tianming Yang
- Institute of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
- University of Chinese Academy of SciencesBeijing100049China
| | - Chi Ren
- Institute of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
| | - Chengyu Li
- Lingang LaboratoryShanghai200031China
- Institute of NeuroscienceState Key Laboratory of Neuroscience, Center for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
| | - Zhengtuo Zhao
- Institute of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai200031China
- University of Chinese Academy of SciencesBeijing100049China
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Miller JA, Voorhies WI, Li X, Raghuram I, Palomero-Gallagher N, Zilles K, Sherwood CC, Hopkins WD, Weiner KS. Sulcal morphology of ventral temporal cortex is shared between humans and other hominoids. Sci Rep 2020; 10:17132. [PMID: 33051475 PMCID: PMC7555511 DOI: 10.1038/s41598-020-73213-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 09/13/2020] [Indexed: 01/27/2023] Open
Abstract
Hominoid-specific brain structures are of particular importance in understanding the evolution of human brain structure and function, as they are absent in mammals that are widely studied in the extended neuroscience field. Recent research indicates that the human fusiform gyrus (FG), which is a hominoid-specific structure critical for complex object recognition, contains a tertiary, longitudinal sulcus (mid-fusiform sulcus, MFS) that bisects the FG into lateral and medial parallel gyri. The MFS is a functional and architectonic landmark in the human brain. Here, we tested if the MFS is specific to the human FG or if the MFS is also identifiable in other hominoids. Using magnetic resonance imaging and cortical surface reconstructions in 30 chimpanzees and 30 humans, we show that the MFS is also present in chimpanzees. The MFS is relatively deeper and cortically thinner in chimpanzees compared to humans. Additional histological analyses reveal that the MFS is not only present in humans and chimpanzees, but also in bonobos, gorillas, orangutans, and gibbons. Taken together, these results reveal that the MFS is a sulcal landmark that is shared between humans and other hominoids. These results require a reconsideration of the sulcal patterning in ventral temporal cortex across hominoids, as well as revise the compensation theory of cortical folding.
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Affiliation(s)
- Jacob A Miller
- Helen Wills Neuroscience Institute, 210 Barker Hall, University of California, Berkeley, Berkeley, CA, 94720, USA.
| | - Willa I Voorhies
- Department of Psychology, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Xiang Li
- School of Clinical Sciences, University of Edinburgh, Edinburgh, UK
| | - Ishana Raghuram
- Department of Psychology, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Nicola Palomero-Gallagher
- Research Centre Jülich, Institute of Neuroscience and Medicine INM-1, Jülich, Germany
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, RWTH Aachen University, Aachen, Germany
- C. & O. Vogt Institute for Brain Research, Heinrich-Heine-University, 40225, Düsseldorf, Germany
| | - Karl Zilles
- Research Centre Jülich, Institute of Neuroscience and Medicine INM-1, Jülich, Germany
- JARA-Translational Brain Medicine, Aachen, Germany
| | - Chet C Sherwood
- Department of Anthropology and Center for the Advanced Study of Human Paleobiology, The George Washington University, 800 22nd Street NW, Suite 6000, Washington, DC, 20052, USA
| | - William D Hopkins
- Department of Comparative Medicine, The University of Texas MD Anderson Cancer Center, Bastrop, TX, 78602, USA
| | - Kevin S Weiner
- Helen Wills Neuroscience Institute, 210 Barker Hall, University of California, Berkeley, Berkeley, CA, 94720, USA
- Department of Psychology, University of California, Berkeley, Berkeley, CA, 94720, USA
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Vincent M, Palombo M, Valette J. Revisiting double diffusion encoding MRS in the mouse brain at 11.7T: Which microstructural features are we sensitive to? Neuroimage 2020; 207:116399. [PMID: 31778817 PMCID: PMC7014823 DOI: 10.1016/j.neuroimage.2019.116399] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 10/25/2019] [Accepted: 11/22/2019] [Indexed: 11/19/2022] Open
Abstract
Brain metabolites, such as N-acetylaspartate or myo-inositol, are constantly probing their local cellular environment under the effect of diffusion. Diffusion-weighted NMR spectroscopy therefore presents unparalleled potential to yield cell-type specific microstructural information. Double diffusion encoding (DDE) consists in applying two diffusion blocks, where gradient's direction in the second block is varied during the course of the experiment. Unlike single diffusion encoding, DDE measurements at long mixing time display some angular modulation of the signal amplitude which reflects microscopic anisotropy (μA), while requiring relatively low gradient strength. This angular dependence has been formerly used to quantify cell fiber diameter using a model of isotropically oriented infinite cylinders. However, how additional features of the cell microstructure (such as cell body diameter, fiber length and branching) may also influence the DDE signal has been little explored. Here, we used a cryoprobe as well as state-of-the-art post-processing to perform DDE acquisitions with high accuracy and precision in the mouse brain at 11.7 T. We then compared our results to simulated DDE datasets obtained in various 3D cell models in order to pinpoint which features of cell morphology may influence the most the angular dependence of the DDE signal. While the infinite cylinder model poorly fits our experimental data, we show that incorporating branched fiber structure in our model allows more realistic interpretation of the DDE signal. Lastly, data acquired in the short mixing time regime suggest that some sensitivity to cell body diameter might be retrieved, although additional experiments would be required to further support this statement.
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Affiliation(s)
- Mélissa Vincent
- Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), MIRCen, F-92260, Fontenay-aux-Roses, France; Neurodegenerative Diseases Laboratory, UMR9199, CEA, CNRS, Université Paris Sud, Université Paris-Saclay, F-92260, Fontenay-aux-Roses, France
| | - Marco Palombo
- Department of Computer Science and Centre for Medical Image Computing, University College of London, London, WC1E 6BT, United Kingdom
| | - Julien Valette
- Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), MIRCen, F-92260, Fontenay-aux-Roses, France; Neurodegenerative Diseases Laboratory, UMR9199, CEA, CNRS, Université Paris Sud, Université Paris-Saclay, F-92260, Fontenay-aux-Roses, France.
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5
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Amiez C, Sallet J, Hopkins WD, Meguerditchian A, Hadj-Bouziane F, Ben Hamed S, Wilson CRE, Procyk E, Petrides M. Sulcal organization in the medial frontal cortex provides insights into primate brain evolution. Nat Commun 2019; 10:3437. [PMID: 31366944 PMCID: PMC6668397 DOI: 10.1038/s41467-019-11347-x] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 07/09/2019] [Indexed: 01/01/2023] Open
Abstract
Although the relative expansion of the frontal cortex in primate evolution is generally accepted, the nature of the human uniqueness, if any, and between-species anatomo-functional comparisons of the frontal areas remain controversial. To provide a novel interpretation of the evolution of primate brains, sulcal morphological variability of the medial frontal cortex was assessed in Old World monkeys (macaque/baboon) and Hominoidea (chimpanzee/human). We show that both Hominoidea possess a paracingulate sulcus, which was previously thought to be unique to the human brain and linked to higher cognitive functions, such as mentalizing. Also, we show systematic sulcal morphological organization of the medial frontal cortex that can be traced from Old World monkeys to Hominoidea species, demonstrating an evolutionarily conserved organizational principle. These data provide a new framework to compare sulcal morphology, cytoarchitectonic areal distribution, connectivity, and function across the primate order, leading to clear predictions about how other primate brains might be anatomo-functionally organized.
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Affiliation(s)
- Céline Amiez
- Univ Lyon, Université Lyon 1, Inserm, Stem Cell and Brain Research Institute U1208, 69500, Bron, France.
| | - Jérôme Sallet
- Wellcome Integrative Neuroimaging Centre, Department of Experimental Psychology, University of Oxford, Oxford, OX1 3SR, UK
| | - William D Hopkins
- Department of Comparative Medicine, University of Texas MD Anderson Cancer Center, Bastrop, TX, 78602, USA
| | - Adrien Meguerditchian
- Laboratoire de Psychologie Cognitive, UMR7290, Université Aix-Marseille, CNRS, 13331, Marseille, France
- Station de Primatologie CNRS, UPS846, 13790, Rousset, France
- Brain & Language Research Institute, Université Aix-Marseille, CNRS, 13604, Aix-en-Provence, France
| | - Fadila Hadj-Bouziane
- Integrative Multisensory Perception Action & Cognition Team (ImpAct), INSERM U1028, CNRS UMR5292, Lyon Neuroscience Research Center (CRNL), University of Lyon 1, 69500, Lyon, France
| | - Suliann Ben Hamed
- Institut des Sciences Cognitives Marc Jeannerod, UMR5229, CNRS-Université Claude Bernard Lyon I, 69675, Bron, France
| | - Charles R E Wilson
- Univ Lyon, Université Lyon 1, Inserm, Stem Cell and Brain Research Institute U1208, 69500, Bron, France
| | - Emmanuel Procyk
- Univ Lyon, Université Lyon 1, Inserm, Stem Cell and Brain Research Institute U1208, 69500, Bron, France
| | - Michael Petrides
- Montreal Neurological Institute, Department of Neurology and Neurosurgery and Department of Psychology, McGill University, Montreal, QC, H3A 2B4, Canada
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Spocter MA, Fairbanks J, Locey L, Nguyen A, Bitterman K, Dunn R, Sherwood CC, Geletta S, Dell LA, Patzke N, Manger PR. Neuropil Distribution in the Anterior Cingulate and Occipital Cortex of Artiodactyls. Anat Rec (Hoboken) 2018; 301:1871-1881. [DOI: 10.1002/ar.23905] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 02/14/2018] [Accepted: 02/26/2018] [Indexed: 01/18/2023]
Affiliation(s)
- Muhammad A. Spocter
- Department of Anatomy; Des Moines University; Des Moines Iowa
- College of Veterinary Medicine, Biomedical Sciences; Iowa State University; Ames Iowa
- School of Anatomical Sciences; University of the Witwatersrand; Johannesburg Republic of South Africa
| | | | - Lisa Locey
- Department of Anatomy; Des Moines University; Des Moines Iowa
| | - Amy Nguyen
- College of Pharmacy and Health Sciences, Drake University; Des Moines Iowa
| | | | - Rachel Dunn
- Department of Anatomy; Des Moines University; Des Moines Iowa
| | - Chet C. Sherwood
- Department of Anthropology and Center for the Advanced Study of Human Paleobiology; The George Washington University; Washington Washington, DC
| | - Simon Geletta
- Department of Public Health; Des Moines University; Des Moines Iowa
| | - Leigh-Anne Dell
- School of Anatomical Sciences; University of the Witwatersrand; Johannesburg Republic of South Africa
- Institute of Computational Neuroscience; University Medical Center Hamburg-Eppendorf; Hamburg Germany
| | - Nina Patzke
- School of Anatomical Sciences; University of the Witwatersrand; Johannesburg Republic of South Africa
- Department of Biology; Hokkaido University; Hokkaido Japan
| | - Paul R. Manger
- School of Anatomical Sciences; University of the Witwatersrand; Johannesburg Republic of South Africa
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7
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Palomero-Gallagher N, Zilles K. Differences in cytoarchitecture of Broca's region between human, ape and macaque brains. Cortex 2018; 118:132-153. [PMID: 30333085 DOI: 10.1016/j.cortex.2018.09.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 08/15/2018] [Accepted: 09/10/2018] [Indexed: 01/01/2023]
Abstract
Areas 44 and 45 have been identified in non-human primates as homologs of the human Broca region. Distribution of large and smaller pyramids and the ventro-lateral localization in the posterior frontal lobe enable their identification in non-human primates. Since only humans hold the ability of language, it has been hypothesized that differences in microstructure may, together with other anatomical factors, e.g., white matter tract connectivity, volumes of cortical areas and their molecular differentiation, be responsible for the lack (non-human primates) or ability (humans) of language. We sought to identify microstructural differences, by quantitatively studying the cytoarchitecture of areas 44 and 45 using layer-specific grey level indices (volume proportion of neuropil and cell bodies) in serially sectioned and cell body stained human, bonobo, chimpanzee, gorilla, orangutan and Macaca fascicularis brains. The main results are the interspecies differences in neuropil volume relative to cell bodies in all layers of both areas which allows a grouping of the different species into three major groups: Homo sapiens has the largest, great apes a markedly lower, and macaque the lowest neuropil volume. This indicates considerably more space for local and interregional connectivity in human brains, which matches recent studies of fiber tracts and spacing of cortical minicolumns because increasing connectivity also requires more space for axons and dendrites in the neuropil. The evolutionary enlargement of neuropil is, therefore, a major structural difference between humans and non-human primates which may correspond to the underlying functional differences.
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Affiliation(s)
- Nicola Palomero-Gallagher
- Institute of Neuroscience and Medicine INM-1, Research Centre Jülich, Jülich, Germany; Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, RWTH Aachen University, Aachen, Germany.
| | - Karl Zilles
- Institute of Neuroscience and Medicine INM-1, Research Centre Jülich, Jülich, Germany; Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, RWTH Aachen University, Aachen, Germany; JARA - Translational Brain Medicine, Aachen, Germany.
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8
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Belyk M, Johnson JF, Kotz SA. Poor neuro-motor tuning of the human larynx: a comparison of sung and whistled pitch imitation. ROYAL SOCIETY OPEN SCIENCE 2018; 5:171544. [PMID: 29765635 PMCID: PMC5936900 DOI: 10.1098/rsos.171544] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 03/13/2018] [Indexed: 06/08/2023]
Abstract
Vocal imitation is a hallmark of human communication that underlies the capacity to learn to speak and sing. Even so, poor vocal imitation abilities are surprisingly common in the general population and even expert vocalists cannot match the precision of a musical instrument. Although humans have evolved a greater degree of control over the laryngeal muscles that govern voice production, this ability may be underdeveloped compared with control over the articulatory muscles, such as the tongue and lips, volitional control of which emerged earlier in primate evolution. Human participants imitated simple melodies by either singing (i.e. producing pitch with the larynx) or whistling (i.e. producing pitch with the lips and tongue). Sung notes were systematically biased towards each individual's habitual pitch, which we hypothesize may act to conserve muscular effort. Furthermore, while participants who sung more precisely also whistled more precisely, sung imitations were less precise than whistled imitations. The laryngeal muscles that control voice production are under less precise control than the oral muscles that are involved in whistling. This imprecision may be due to the relatively recent evolution of volitional laryngeal-motor control in humans, which may be tuned just well enough for the coarse modulation of vocal-pitch in speech.
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Affiliation(s)
- Michel Belyk
- Bloorview Research Institute, 150 Kilgour Road, Toronto, CanadaM4G 1R8
- Faculty of Psychology and Neuroscience, University of Maastricht, Maastricht, The Netherlands
| | - Joseph F. Johnson
- Faculty of Psychology and Neuroscience, University of Maastricht, Maastricht, The Netherlands
| | - Sonja A. Kotz
- Faculty of Psychology and Neuroscience, University of Maastricht, Maastricht, The Netherlands
- Department of Neuropsychology, Max Planck Institute for Human and Cognitive Sciences, Leipzig, Germany
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Carey D, Krishnan S, Callaghan MF, Sereno MI, Dick F. Functional and Quantitative MRI Mapping of Somatomotor Representations of Human Supralaryngeal Vocal Tract. Cereb Cortex 2018; 27:265-278. [PMID: 28069761 PMCID: PMC5808730 DOI: 10.1093/cercor/bhw393] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Indexed: 12/15/2022] Open
Abstract
Speech articulation requires precise control of and coordination between the effectors of the vocal tract (e.g., lips, tongue, soft palate, and larynx). However, it is unclear how the cortex represents movements of and contact between these effectors during speech, or how these cortical responses relate to inter-regional anatomical borders. Here, we used phase-encoded fMRI to map somatomotor representations of speech articulations. Phonetically trained participants produced speech phones, progressing from front (bilabial) to back (glottal) place of articulation. Maps of cortical myelin proxies (R1 = 1/T1) further allowed us to situate functional maps with respect to anatomical borders of motor and somatosensory regions. Across participants, we found a consistent topological map of place of articulation, spanning the central sulcus and primary motor and somatosensory areas, that moved from lateral to inferior as place of articulation progressed from front to back. Phones produced at velar and glottal places of articulation activated the inferior aspect of the central sulcus, but with considerable across-subject variability. R1 maps for a subset of participants revealed that articulator maps extended posteriorly into secondary somatosensory regions. These results show consistent topological organization of cortical representations of the vocal apparatus in the context of speech behavior.
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Affiliation(s)
- Daniel Carey
- Department of Psychology, Royal Holloway, University of London, London, TW20 0EX, UK.,The Irish Longitudinal Study on Ageing, Department of Medical Gerontology, Trinity College Dublin, Dublin 2, Ireland.,Department of Psychological Sciences, Birkbeck College, University of London, Malet St, London, WC1E 7HX, UK
| | - Saloni Krishnan
- Department of Psychological Sciences, Birkbeck College, University of London, Malet St, London, WC1E 7HX, UK.,Department of Experimental Psychology, Tinbergen Building, 9 South Parks Road, Oxford, OX1 3UD, UK
| | - Martina F Callaghan
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, 12 Queen Square, London, WC1N 3BG, UK
| | - Martin I Sereno
- Department of Psychological Sciences, Birkbeck College, University of London, Malet St, London, WC1E 7HX, UK.,Birkbeck/UCL Centre for Neuroimaging, 26 Bedford Way, London, WC1H 0AP, UK.,Department of Experimental Psychology, UCL Division of Psychology and Language Sciences, 26 Bedford Way, London, WC1H 0AP, UK.,Department of Psychology, College of Sciences, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182-4611, USA
| | - Frederic Dick
- Department of Psychological Sciences, Birkbeck College, University of London, Malet St, London, WC1E 7HX, UK.,Birkbeck/UCL Centre for Neuroimaging, 26 Bedford Way, London, WC1H 0AP, UK
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10
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Zilles K, Palomero-Gallagher N. Multiple Transmitter Receptors in Regions and Layers of the Human Cerebral Cortex. Front Neuroanat 2017; 11:78. [PMID: 28970785 PMCID: PMC5609104 DOI: 10.3389/fnana.2017.00078] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 08/24/2017] [Indexed: 01/16/2023] Open
Abstract
We measured the densities (fmol/mg protein) of 15 different receptors of various transmitter systems in the supragranular, granular and infragranular strata of 44 areas of visual, somatosensory, auditory and multimodal association systems of the human cerebral cortex. Receptor densities were obtained after labeling of the receptors using quantitative in vitro receptor autoradiography in human postmortem brains. The mean density of each receptor type over all cortical layers and of each of the three major strata varies between cortical regions. In a single cortical area, the multi-receptor fingerprints of its strata (i.e., polar plots, each visualizing the densities of multiple different receptor types in supragranular, granular or infragranular layers of the same cortical area) differ in shape and size indicating regional and laminar specific balances between the receptors. Furthermore, the three strata are clearly segregated into well definable clusters by their receptor fingerprints. Fingerprints of different cortical areas systematically vary between functional networks, and with the hierarchical levels within sensory systems. Primary sensory areas are clearly separated from all other cortical areas particularly by their very high muscarinic M2 and nicotinic α4β2 receptor densities, and to a lesser degree also by noradrenergic α2 and serotonergic 5-HT2 receptors. Early visual areas of the dorsal and ventral streams are segregated by their multi-receptor fingerprints. The results are discussed on the background of functional segregation, cortical hierarchies, microstructural types, and the horizontal (layers) and vertical (columns) organization in the cerebral cortex. We conclude that a cortical column is composed of segments, which can be assigned to the cortical strata. The segments differ by their patterns of multi-receptor balances, indicating different layer-specific signal processing mechanisms. Additionally, the differences between the strata-and area-specific fingerprints of the 44 areas reflect the segregation of the cerebral cortex into functionally and topographically definable groups of cortical areas (visual, auditory, somatosensory, limbic, motor), and reveals their hierarchical position (primary and unimodal (early) sensory to higher sensory and finally to multimodal association areas). HighlightsDensities of transmitter receptors vary between areas of human cerebral cortex. Multi-receptor fingerprints segregate cortical layers. The densities of all examined receptor types together reach highest values in the supragranular stratum of all areas. The lowest values are found in the infragranular stratum. Multi-receptor fingerprints of entire areas and their layers segregate functional systems Cortical types (primary sensory, motor, multimodal association) differ in their receptor fingerprints.
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Affiliation(s)
- Karl Zilles
- Research Centre Jülich, Institute of Neuroscience and Medicine (INM-1)Jülich, Germany.,Department of Psychiatry, Psychotherapy, and Psychosomatics, Medical Faculty, RWTH Aachen, and JARA-Translational Brain MedicineAachen, Germany
| | - Nicola Palomero-Gallagher
- Research Centre Jülich, Institute of Neuroscience and Medicine (INM-1)Jülich, Germany.,Department of Psychiatry, Psychotherapy, and Psychosomatics, Medical Faculty, RWTH Aachen, and JARA-Translational Brain MedicineAachen, Germany
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11
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Müri RM. Cortical control of facial expression. J Comp Neurol 2017; 524:1578-85. [PMID: 26418049 DOI: 10.1002/cne.23908] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Revised: 06/03/2015] [Accepted: 09/25/2015] [Indexed: 11/10/2022]
Abstract
The present Review deals with the motor control of facial expressions in humans. Facial expressions are a central part of human communication. Emotional face expressions have a crucial role in human nonverbal behavior, allowing a rapid transfer of information between individuals. Facial expressions can be either voluntarily or emotionally controlled. Recent studies in nonhuman primates and humans have revealed that the motor control of facial expressions has a distributed neural representation. At least five cortical regions on the medial and lateral aspects of each hemisphere are involved: the primary motor cortex, the ventral lateral premotor cortex, the supplementary motor area on the medial wall, and the rostral and caudal cingulate cortex. The results of studies in humans and nonhuman primates suggest that the innervation of the face is bilaterally controlled for the upper part and mainly contralaterally controlled for the lower part. Furthermore, the primary motor cortex, the ventral lateral premotor cortex, and the supplementary motor area are essential for the voluntary control of facial expressions. In contrast, the cingulate cortical areas are important for emotional expression, because they receive input from different structures of the limbic system.
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Affiliation(s)
- René M Müri
- Division of Cognitive and Restorative Neurology, Departments of Neurology and Clinical Research, University Hospital Inselspital, 3010, Bern, Switzerland.,Gerontechnology and Rehabilitation Group, University of Bern, 3012, Bern, Switzerland.,Center for Cognition, Learning, and Memory, University of Bern, 3012, Bern, Switzerland
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12
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Percheron G, François C, Pouget P. What makes a frontal area of primate brain the frontal eye field? Front Integr Neurosci 2015; 9:33. [PMID: 26042006 PMCID: PMC4434979 DOI: 10.3389/fnint.2015.00033] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Accepted: 04/12/2015] [Indexed: 12/01/2022] Open
Abstract
The frontal eye field region (FEF) of the oculomotor pathways has been intensely studied. The primary goal of this review is to illustrate the phylogenetic displacement of the FEF locus in primate species. The locus is arrayed along the arcuate sulcus in monkeys and abuts into the primary motor strip region in humans. The strengths and limitations of the various functional, anatomical and histological methodologies used to identify such regions are also discussed.
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Affiliation(s)
- Gérard Percheron
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, CNRS, UM75, U1127, UMR 7225, ICM Paris, France
| | - Chantal François
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, CNRS, UM75, U1127, UMR 7225, ICM Paris, France
| | - Pierre Pouget
- Sorbonne Universités, UPMC Univ Paris 06, INSERM, CNRS, UM75, U1127, UMR 7225, ICM Paris, France
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13
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Abstract
In primates, different vocalizations are produced, at least in part, by making different facial expressions. Not surprisingly, humans, apes, and monkeys all recognize the correspondence between vocalizations and the facial postures associated with them. However, one major dissimilarity between monkey vocalizations and human speech is that, in the latter, the acoustic output and associated movements of the mouth are both rhythmic (in the 3- to 8-Hz range) and tightly correlated, whereas monkey vocalizations have a similar acoustic rhythmicity but lack the concommitant rhythmic facial motion. This raises the question of how we evolved from a presumptive ancestral acoustic-only vocal rhythm to the one that is audiovisual with improved perceptual sensitivity. According to one hypothesis, this bisensory speech rhythm evolved through the rhythmic facial expressions of ancestral primates. If this hypothesis has any validity, we expect that the extant nonhuman primates produce at least some facial expressions with a speech-like rhythm in the 3- to 8-Hz frequency range. Lip smacking, an affiliative signal observed in many genera of primates, satisfies this criterion. We review a series of studies using developmental, x-ray cineradiographic, EMG, and perceptual approaches with macaque monkeys producing lip smacks to further investigate this hypothesis. We then explore its putative neural basis and remark on important differences between lip smacking and speech production. Overall, the data support the hypothesis that lip smacking may have been an ancestral expression that was linked to vocal output to produce the original rhythmic audiovisual speech-like utterances in the human lineage.
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14
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Najac C, Marchadour C, Guillermier M, Houitte D, Slavov V, Brouillet E, Hantraye P, Lebon V, Valette J. Intracellular metabolites in the primate brain are primarily localized in long fibers rather than in cell bodies, as shown by diffusion-weighted magnetic resonance spectroscopy. Neuroimage 2014; 90:374-80. [DOI: 10.1016/j.neuroimage.2013.12.045] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 11/21/2013] [Accepted: 12/15/2013] [Indexed: 10/25/2022] Open
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15
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Cattaneo L, Pavesi G. The facial motor system. Neurosci Biobehav Rev 2013; 38:135-59. [PMID: 24239732 DOI: 10.1016/j.neubiorev.2013.11.002] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Revised: 10/18/2013] [Accepted: 11/02/2013] [Indexed: 12/23/2022]
Abstract
Facial movements support a variety of functions in human behavior. They participate in automatic somatic and visceral motor programs, they are essential in producing communicative displays of affective states and they are also subject to voluntary control. The multiplicity of functions of facial muscles, compared to limb muscles, is reflected in the heterogeneity of their anatomical and histological characteristics that goes well beyond the conventional classification in single facial muscles. Such parcellation in different functional muscular units is maintained throughout the central representation of facial movements from the brainstem up to the neocortex. Facial movements peculiarly lack a conventional proprioceptive feedback system, which is only in part vicariated by cutaneous or auditory afferents. Facial motor activity is the main marker of endogenous affective states and of the affective valence of external stimuli. At the cortical level, a complex network of specialized motor areas supports voluntary facial movements and, differently from upper limb movements, in such network there does not seem to be a prime actor in the primary motor cortex.
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Affiliation(s)
- Luigi Cattaneo
- Center for Mind/Brain Sciences, University of Trento, Via delle Regole 101, Mattarello, Trento 38123, Italy.
| | - Giovanni Pavesi
- Department of Neuroscience, University of Parma, Via Gramsci 14, Parma 43100, Italy
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16
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Facial expressions in common marmosets (Callithrix jacchus) and their use by conspecifics. Anim Cogn 2013; 16:773-88. [DOI: 10.1007/s10071-013-0611-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2012] [Revised: 01/26/2013] [Accepted: 01/31/2013] [Indexed: 10/27/2022]
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17
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Spocter MA, Hopkins WD, Barks SK, Bianchi S, Hehmeyer AE, Anderson SM, Stimpson CD, Fobbs AJ, Hof PR, Sherwood CC. Neuropil distribution in the cerebral cortex differs between humans and chimpanzees. J Comp Neurol 2012; 520:2917-29. [PMID: 22350926 DOI: 10.1002/cne.23074] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Increased connectivity of high-order association regions in the neocortex has been proposed as a defining feature of human brain evolution. At present, however, there are limited comparative data to examine this claim fully. We tested the hypothesis that the distribution of neuropil across areas of the neocortex of humans differs from that of one of our closest living relatives, the common chimpanzee. The neuropil provides a proxy measure of total connectivity within a local region because it is composed mostly of dendrites, axons, and synapses. Using image analysis techniques, we quantified the neuropil fraction from both hemispheres in six cytoarchitectonically defined regions including frontopolar cortex (area 10), Broca's area (area 45), frontoinsular cortex (area FI), primary motor cortex (area 4), primary auditory cortex (area 41/42), and the planum temporale (area 22). Our results demonstrate that humans exhibit a unique distribution of neuropil in the neocortex compared to chimpanzees. In particular, the human frontopolar cortex and the frontoinsular cortex had a significantly higher neuropil fraction than the other areas. In chimpanzees these prefrontal regions did not display significantly more neuropil, but the primary auditory cortex had a lower neuropil fraction than other areas. Our results support the conclusion that enhanced connectivity in the prefrontal cortex accompanied the evolution of the human brain. These species differences in neuropil distribution may offer insight into the neural basis of human cognition, reflecting enhancement of the integrative capacity of the prefrontal cortex.
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Affiliation(s)
- Muhammad A Spocter
- Department of Anthropology, The George Washington University, Washington, DC 20052, USA
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18
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Abstract
Recent comparative evidence suggests that anthropoid primates are the only vertebrates to exhibit a quantitative relationship between relative brain size and social group size. In this paper, I attempt to explain this pattern with regard to facial expressivity and social bonding. I hypothesize that facial motor control increases as a secondary consequence of neocortical expansion owing to cortical innervation of the facial motor nucleus. This is supported by new analyses demonstrating correlated evolution between relative neocortex size and relative facial nucleus size. I also hypothesize that increased facial motor control correlates with enhanced emotional expressivity, which provides the opportunity for individuals to better gauge the trustworthiness of group members. This is supported by previous evidence from human psychology, as well as new analyses demonstrating a positive relationship between allogrooming and facial nucleus volume. I suggest new approaches to the study of primate facial expressivity in light of these hypotheses.
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Affiliation(s)
- Seth Dobson
- Department of Anthropology, Dartmouth College, Hanover, NH 03755, USA.
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19
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Facial muscle coordination in monkeys during rhythmic facial expressions and ingestive movements. J Neurosci 2012; 32:6105-16. [PMID: 22553017 DOI: 10.1523/jneurosci.6136-11.2012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Evolutionary hypotheses regarding the origins of communication signals generally suggest, particularly for the case of primate orofacial signals, that they derive by ritualization of noncommunicative behaviors, notably including ingestive behaviors such as chewing and nursing. These theories are appealing in part because of the prominent periodicities in both types of behavior. Despite their intuitive appeal, however, there are little or no data with which to evaluate these theories because the coordination of muscles innervated by the facial nucleus has not been carefully compared between communicative and ingestive movements. Such data are especially crucial for reconciling neurophysiological assumptions regarding facial motor control in communication and ingestion. We here address this gap by contrasting the coordination of facial muscles during different types of rhythmic orofacial behavior in macaque monkeys, finding that the perioral muscles innervated by the facial nucleus are rhythmically coordinated during lipsmacks and that this coordination appears distinct from that observed during ingestion.
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20
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Flint JJ, Hansen B, Portnoy S, Lee CH, King MA, Fey M, Vincent F, Stanisz GJ, Vestergaard-Poulsen P, Blackband SJ. Magnetic resonance microscopy of human and porcine neurons and cellular processes. Neuroimage 2012; 60:1404-11. [PMID: 22281672 DOI: 10.1016/j.neuroimage.2012.01.050] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Revised: 12/14/2011] [Accepted: 01/05/2012] [Indexed: 11/26/2022] Open
Abstract
With its unparalleled ability to safely generate high-contrast images of soft tissues, magnetic resonance imaging (MRI) has remained at the forefront of diagnostic clinical medicine. Unfortunately due to resolution limitations, clinical scans are most useful for detecting macroscopic structural changes associated with a small number of pathologies. Moreover, due to a longstanding inability to directly observe magnetic resonance (MR) signal behavior at the cellular level, such information is poorly characterized and generally must be inferred. With the advent of the MR microscope in 1986 came the ability to measure MR signal properties of theretofore unobservable tissue structures. Recently, further improvements in hardware technology have made possible the ability to visualize mammalian cellular structure. In the current study, we expand upon previous work by imaging the neuronal cell bodies and processes of human and porcine α-motor neurons. Complimentary imaging studies are conducted in pig tissue in order to demonstrate qualitative similarities to human samples. Also, apparent diffusion coefficient (ADC) maps were generated inside porcine α-motor neuron cell bodies and portions of their largest processes (mean=1.7 ± 0.5 μm²/ms based on 53 pixels) as well as in areas containing a mixture of extracellular space, microvasculature, and neuropil (0.59 ± 0.37 μm²/ms based on 33 pixels). Three-dimensional reconstruction of MR images containing α-motor neurons shows the spatial arrangement of neuronal projections between adjacent cells. Such advancements in imaging portend the ability to construct accurate models of MR signal behavior based on direct observation and measurement of the components which comprise functional tissues. These tools would not only be useful for improving our interpretation of macroscopic MRI performed in the clinic, but they could potentially be used to develop new methods of differential diagnosis to aid in the early detection of a multitude of neuropathologies.
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Affiliation(s)
- Jeremy J Flint
- McKnight Brain Institute, Dep. of Neuroscience, University of Florida, FL, USA.
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21
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Chandrasekaran C, Lemus L, Trubanova A, Gondan M, Ghazanfar AA. Monkeys and humans share a common computation for face/voice integration. PLoS Comput Biol 2011; 7:e1002165. [PMID: 21998576 PMCID: PMC3182859 DOI: 10.1371/journal.pcbi.1002165] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Accepted: 07/03/2011] [Indexed: 11/18/2022] Open
Abstract
Speech production involves the movement of the mouth and other regions of the face resulting in visual motion cues. These visual cues enhance intelligibility and detection of auditory speech. As such, face-to-face speech is fundamentally a multisensory phenomenon. If speech is fundamentally multisensory, it should be reflected in the evolution of vocal communication: similar behavioral effects should be observed in other primates. Old World monkeys share with humans vocal production biomechanics and communicate face-to-face with vocalizations. It is unknown, however, if they, too, combine faces and voices to enhance their perception of vocalizations. We show that they do: monkeys combine faces and voices in noisy environments to enhance their detection of vocalizations. Their behavior parallels that of humans performing an identical task. We explored what common computational mechanism(s) could explain the pattern of results we observed across species. Standard explanations or models such as the principle of inverse effectiveness and a "race" model failed to account for their behavior patterns. Conversely, a "superposition model", positing the linear summation of activity patterns in response to visual and auditory components of vocalizations, served as a straightforward but powerful explanatory mechanism for the observed behaviors in both species. As such, it represents a putative homologous mechanism for integrating faces and voices across primates.
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Affiliation(s)
- Chandramouli Chandrasekaran
- Neuroscience Institute, Princeton University, Princeton, New Jersey, United States of America
- Department of Psychology, Princeton University, Princeton, New Jersey, United States of America
| | - Luis Lemus
- Neuroscience Institute, Princeton University, Princeton, New Jersey, United States of America
- Department of Psychology, Princeton University, Princeton, New Jersey, United States of America
| | - Andrea Trubanova
- Department of Psychology, Princeton University, Princeton, New Jersey, United States of America
- Marcus Autism Center, Emory University School of Medicine, Atlanta, Georgia, United States of America
| | - Matthias Gondan
- Department of Psychology, University of Regensburg, Regensburg, Germany
- Medical Biometry and Informatics, University of Heidelberg, Heidelberg, Germany
| | - Asif A. Ghazanfar
- Neuroscience Institute, Princeton University, Princeton, New Jersey, United States of America
- Department of Psychology, Princeton University, Princeton, New Jersey, United States of America
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, United States of America
- * E-mail:
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22
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Ross MD, Owren MJ, Zimmermann E. The evolution of laughter in great apes and humans. Commun Integr Biol 2011; 3:191-4. [PMID: 20585520 DOI: 10.4161/cib.3.2.10944] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2009] [Accepted: 12/12/2009] [Indexed: 11/19/2022] Open
Abstract
It has long been claimed that human emotional expressions, such as laughter, have evolved from nonhuman displays. The aim of the current study was to test this prediction by conducting acoustic and phylogenetic analyses based on the acoustics of tickle-induced vocalizations of orangutans, gorillas, chimpanzees, bonobos and humans. Results revealed both important similarities and differences among the various species' vocalizations, with the phylogenetic tree reconstructed based on these acoustic data matching the well-established genetic relationships of great apes and humans. These outcomes provide evidence of a common phylogenetic origin of tickle-induced vocalizations in these taxa, which can therefore be termed "laughter" across all five species. Results are consistent with the claims of phylogenetic continuity of emotional expressions. Together with observations made on the use of laughter in great apes and humans, findings of this study further indicate that there were two main periods of selection-driven evolutionary change in laughter within the Hominidae, to a smaller degree, among the great apes and, most distinctively, after the separation of hominins from the last common ancestor with chimpanzees and bonobos.
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23
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Zilles K, Amunts K, Smaers JB. Three brain collections for comparative neuroanatomy and neuroimaging. Ann N Y Acad Sci 2011; 1225 Suppl 1:E94-104. [DOI: 10.1111/j.1749-6632.2011.05978.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Smaers JB, Steele J, Case CR, Cowper A, Amunts K, Zilles K. Primate prefrontal cortex evolution: human brains are the extreme of a lateralized ape trend. BRAIN, BEHAVIOR AND EVOLUTION 2011; 77:67-78. [PMID: 21335939 DOI: 10.1159/000323671] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Accepted: 12/13/2010] [Indexed: 11/19/2022]
Abstract
The prefrontal cortex is commonly associated with cognitive capacities related to human uniqueness: purposeful actions towards higher-level goals, complex social information processing, introspection, and language. Comparative investigations of the prefrontal cortex may thus shed more light on the neural underpinnings of what makes us human. Using histological data from 19 anthropoid primate species (6 apes including humans and 13 monkeys), we investigate cross-species relative size changes along the anterior (prefrontal) and posterior (motor) axes of the cytoarchitectonically defined frontal lobe in both hemispheres. Results reveal different scaling coefficients in the left versus right prefrontal hemisphere, suggest that the primary factor underlying the evolution of primate brain architecture is left hemispheric prefrontal hyperscaling, and indicate that humans are the extreme of a left prefrontal ape specialization in relative white to grey matter volume. These results demonstrate a neural adaptive shift distinguishing the ape from the monkey radiation possibly related to a cognitive grade shift between (great) apes and other primates.
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Affiliation(s)
- J B Smaers
- AHRC Centre for the Evolution of Cultural Diversity, London, UK.
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25
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Semendeferi K, Teffer K, Buxhoeveden DP, Park MS, Bludau S, Amunts K, Travis K, Buckwalter J. Spatial organization of neurons in the frontal pole sets humans apart from great apes. Cereb Cortex 2010; 21:1485-97. [PMID: 21098620 DOI: 10.1093/cercor/bhq191] [Citation(s) in RCA: 155] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Few morphological differences have been identified so far that distinguish the human brain from the brains of our closest relatives, the apes. Comparative analyses of the spatial organization of cortical neurons, including minicolumns, can aid our understanding of the functionally relevant aspects of microcircuitry. We measured horizontal spacing distance and gray-level ratio in layer III of 4 regions of human and ape cortex in all 6 living hominoid species: frontal pole (Brodmann area [BA] 10), and primary motor (BA 4), primary somatosensory (BA 3), and primary visual cortex (BA 17). Our results identified significant differences between humans and apes in the frontal pole (BA 10). Within the human brain, there were also significant differences between the frontal pole and 2 of the 3 regions studied (BA 3 and BA 17). Differences between BA 10 and BA 4 were present but did not reach significance. These findings in combination with earlier findings on BA 44 and BA 45 suggest that human brain evolution was likely characterized by an increase in the number and width of minicolumns and the space available for interconnectivity between neurons in the frontal lobe, especially the prefrontal cortex.
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Affiliation(s)
- Katerina Semendeferi
- Department of Anthropology, University of California, San Diego, La Jolla, CA 92093, USA
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26
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Ghazanfar AA, Chandrasekaran C, Morrill RJ. Dynamic, rhythmic facial expressions and the superior temporal sulcus of macaque monkeys: implications for the evolution of audiovisual speech. Eur J Neurosci 2010; 31:1807-17. [PMID: 20584185 DOI: 10.1111/j.1460-9568.2010.07209.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Audiovisual speech has a stereotypical rhythm that is between 2 and 7 Hz, and deviations from this frequency range in either modality reduce intelligibility. Understanding how audiovisual speech evolved requires investigating the origins of this rhythmic structure. One hypothesis is that the rhythm of speech evolved through the modification of some pre-existing cyclical jaw movements in a primate ancestor. We tested this hypothesis by investigating the temporal structure of lipsmacks and teeth-grinds of macaque monkeys and the neural responses to these facial gestures in the superior temporal sulcus (STS), a region implicated in the processing of audiovisual communication signals in both humans and monkeys. We found that both lipsmacks and teeth-grinds have consistent but distinct peak frequencies and that both fall well within the 2-7 Hz range of mouth movements associated with audiovisual speech. Single neurons and local field potentials of the STS of monkeys readily responded to such facial rhythms, but also responded just as robustly to yawns, a nonrhythmic but dynamic facial expression. All expressions elicited enhanced power in the delta (0-3Hz), theta (3-8Hz), alpha (8-14Hz) and gamma (> 60 Hz) frequency ranges, and suppressed power in the beta (20-40Hz) range. Thus, STS is sensitive to, but not selective for, rhythmic facial gestures. Taken together, these data provide support for the idea that that audiovisual speech evolved (at least in part) from the rhythmic facial gestures of an ancestral primate and that the STS was sensitive to and thus 'prepared' for the advent of rhythmic audiovisual communication.
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Affiliation(s)
- Asif A Ghazanfar
- Neuroscience Institute, Princeton University, Princeton, NJ 08540, USA.
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27
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Yablonskiy DA, Sukstanskii AL. Theoretical models of the diffusion weighted MR signal. NMR IN BIOMEDICINE 2010; 23:661-81. [PMID: 20886562 PMCID: PMC6429954 DOI: 10.1002/nbm.1520] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Diffusion MRI plays a very important role in studying biological tissue structure and functioning both in health and disease. Proper interpretation of experimental data requires development of theoretical models that connect the diffusion MRI signal to salient features of tissue microstructure at the cellular level. In this review, we present some models (mostly, relevant to the brain) for describing diffusion attenuated MR signals. These range from the simplest approach, where the signal is described in terms of an apparent diffusion coefficient, to rather complicated models, where consideration is given to signals originating from extra- and intracellular spaces and where account is taken of the specific geometry and orientation distribution of cells. To better understand the characteristics of the diffusion attenuated MR signal arising from the complex structure of whole tissue, it is instructive to appreciate first the characteristics of the signal arising from simple single-cell-like structures. For this purpose, we also present here a theoretical analysis of models allowing exact analytical calculation of the MR signal, specifically, a single-compartment model with impermeable boundaries and a periodic structure of identical cells separated by permeable membranes. Such pure theoretical models give important insights into mechanisms contributing to the MR signal formation in the presence of diffusion. In this review we targeted both scientists just entering the MR field and more experienced MR researchers interested in applying diffusion methods to study biological tissues.
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28
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Smaers JB, Schleicher A, Zilles K, Vinicius L. Frontal white matter volume is associated with brain enlargement and higher structural connectivity in anthropoid primates. PLoS One 2010; 5:e9123. [PMID: 20161758 PMCID: PMC2817750 DOI: 10.1371/journal.pone.0009123] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Accepted: 01/15/2010] [Indexed: 11/18/2022] Open
Abstract
Previous research has indicated the importance of the frontal lobe and its 'executive' connections to other brain structures as crucial in explaining primate neocortical adaptations. However, a representative sample of volumetric measurements of frontal connective tissue (white matter) has not been available. In this study, we present new volumetric measurements of white and grey matter in the frontal and non-frontal neocortical lobes from 18 anthropoid species. We analyze this data in the context of existing theories of neocortex, frontal lobe and white versus grey matter hyperscaling. Results indicate that the 'universal scaling law' of neocortical white to grey matter applies separately for frontal and non-frontal lobes; that hyperscaling of both neocortex and frontal lobe to rest of brain is mainly due to frontal white matter; and that changes in frontal (but not non-frontal) white matter volume are associated with changes in rest of brain and basal ganglia, a group of subcortical nuclei functionally linked to 'executive control'. Results suggest a central role for frontal white matter in explaining neocortex and frontal lobe hyperscaling, brain size variation and higher neural structural connectivity in anthropoids.
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Affiliation(s)
- Jeroen Bert Smaers
- Department of Biological Anthropology, Leverhulme Centre for Human Evolutionary Studies, University of Cambridge, Cambridge, United Kingdom.
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29
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de Sousa AA, Sherwood CC, Schleicher A, Amunts K, MacLeod CE, Hof PR, Zilles K. Comparative cytoarchitectural analyses of striate and extrastriate areas in hominoids. ACTA ACUST UNITED AC 2009; 20:966-81. [PMID: 19776344 DOI: 10.1093/cercor/bhp158] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
The visual cortex is the largest sensory modality representation in the neocortex of humans and closely related species, and its size and organization has a central role in discussions of brain evolution. Yet little is known about the organization of visual brain structures in the species closest to humans--the apes--thus, making it difficult to evaluate hypotheses about recent evolutionary changes. The primate visual cortex is comprised of numerous cytoarchitectonically distinct areas, each of which has a specific role in the processing of visual stimuli. We examined the histological organization of striate (V1) and 2 extrastriate (V2 and ventral posterior) cortical areas in humans, 5 ape species, and a macaque. The cytoarchitectural patterns of visual areas were compared across species using quantitative descriptions of cell volume densities and laminar patterns. We also investigated potential scaling relationships between cell volume density and several brain, body, and visual system variables. The results suggest that interspecific variability in the cytoarchitectural organization of visual system structures can arise independently of global brain and body size scaling relationships. In particular, species-specific differences in cell volume density seem to be most closely linked to the size of structures in the visual system.
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Affiliation(s)
- Alexandra A de Sousa
- Center for Advanced Study of Hominid Paleobiology, Department of Anthropology, The George Washington University, Washington, DC 20052, USA.
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Jespersen SN, Bjarkam CR, Nyengaard JR, Chakravarty MM, Hansen B, Vosegaard T, Østergaard L, Yablonskiy D, Nielsen NC, Vestergaard-Poulsen P. Neurite density from magnetic resonance diffusion measurements at ultrahigh field: comparison with light microscopy and electron microscopy. Neuroimage 2009; 49:205-16. [PMID: 19732836 DOI: 10.1016/j.neuroimage.2009.08.053] [Citation(s) in RCA: 211] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2009] [Revised: 08/05/2009] [Accepted: 08/25/2009] [Indexed: 11/24/2022] Open
Abstract
Due to its unique sensitivity to tissue microstructure, diffusion-weighted magnetic resonance imaging (MRI) has found many applications in clinical and fundamental science. With few exceptions, a more precise correspondence between physiological or biophysical properties and the obtained diffusion parameters remain uncertain due to lack of specificity. In this work, we address this problem by comparing diffusion parameters of a recently introduced model for water diffusion in brain matter to light microscopy and quantitative electron microscopy. Specifically, we compare diffusion model predictions of neurite density in rats to optical myelin staining intensity and stereological estimation of neurite volume fraction using electron microscopy. We find that the diffusion model describes data better and that its parameters show stronger correlation with optical and electron microscopy, and thus reflect myelinated neurite density better than the more frequently used diffusion tensor imaging (DTI) and cumulant expansion methods. Furthermore, the estimated neurite orientations capture dendritic architecture more faithfully than DTI diffusion ellipsoids.
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Affiliation(s)
- Sune N Jespersen
- Center of Functionally Integrative Neuroscience, Aarhus University Hospital, Nørrebrogade 44, Arhus C, Denmark.
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Schleicher A, Morosan P, Amunts K, Zilles K. Quantitative Architectural Analysis: A New Approach to Cortical Mapping. J Autism Dev Disord 2009; 39:1568-81. [DOI: 10.1007/s10803-009-0790-8] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2008] [Accepted: 06/15/2009] [Indexed: 12/19/2022]
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Mackey S, Petrides M. Architectonic mapping of the medial region of the human orbitofrontal cortex by density profiles. Neuroscience 2009; 159:1089-107. [PMID: 19356690 DOI: 10.1016/j.neuroscience.2009.01.036] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2008] [Revised: 01/12/2009] [Accepted: 01/16/2009] [Indexed: 10/21/2022]
Abstract
The study of architectonic differentiation in the cortex is advanced by the articulation of objective definitions based on clear features of the cortical architecture. We adopted areal density profiles as a means of sampling the cortex. On the profiles, we isolated and quantified the density of individual cortical layers. These features may serve as criteria in objective definitions in a way that builds on qualitative observations found in the classical literature. A preprocessing procedure was introduced to overcome artefacts in the density profiles caused by the partial overlap of neighboring neuronal layers and cortical folding. We applied this method to the medial half of the orbital frontal cortex in specimens drawn from 10 human postmortem brain hemispheres. The measurements successfully confirmed the existence of several qualitatively observed areas (architectonic areas 14c, 14r, 11m, 11 and 13). The selection of specific sampling parameters was justified on the basis of simultaneous measurements of the cortical morphology which demonstrate its influence on the appearance of the cortical layers. We also examined the robustness of the measuring procedure by analyzing the outcome of varying systematically the sampling parameters. We describe here a novel method of sampling the cortex for architectonic analysis and demonstrate its application on histological sections obtained from the medial half of the human orbitofrontal cortex.
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Affiliation(s)
- S Mackey
- Montreal Neurological Institute, McGill University, 3801 University Street, Montreal, Quebec, Canada
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Sherwood CC, Wahl E, Erwin JM, Hof PR, Hopkins WD. Histological asymmetries of primary motor cortex predict handedness in chimpanzees (Pan troglodytes). J Comp Neurol 2007; 503:525-37. [PMID: 17534947 PMCID: PMC2680156 DOI: 10.1002/cne.21399] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Like humans, chimpanzees display robust and consistent hand preferences during the performance of certain tasks. Although correlations have been demonstrated between gross anatomic measures of primary motor cortex asymmetry and handedness in captive chimpanzees, the relationship between histological architecture and behavioral lateralization has not yet been investigated. Therefore, we examined interhemispheric asymmetry of several different microstructural characteristics of the primary motor cortex in the region of hand representation from 18 chimpanzees tested on a coordinated bimanual task before death. At the population level our data showed leftward bias for higher layer II/III neuron density. Of note, however, there was no population-level asymmetry in the areal fraction of Nissl-stained cell bodies, a finding that differs from previous studies of this cortical region in humans. Nonetheless, we found that asymmetry in the density of layer II/III parvalbumin-immunoreactive interneurons was the best predictor of individual hand preference. 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.
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Affiliation(s)
- Chet C Sherwood
- Department of Anthropology, The George Washington University, 2110 G Street NW, Washington, DC 20052, USA.
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Abstract
The natural communication of apes may hold clues about language origins, especially because apes frequently gesture with limbs and hands, a mode of communication thought to have been the starting point of human language evolution. The present study aimed to contrast brachiomanual gestures with orofacial movements and vocalizations in the natural communication of our closest primate relatives, bonobos (Pan paniscus) and chimpanzees (Pan troglodytes). We tested whether gesture is the more flexible form of communication by measuring the strength of association between signals and specific behavioral contexts, comparing groups of both the same and different ape species. Subjects were two captive bonobo groups, a total of 13 individuals, and two captive chimpanzee groups, a total of 34 individuals. The study distinguished 31 manual gestures and 18 facial/vocal signals. It was found that homologous facial/vocal displays were used very similarly by both ape species, yet the same did not apply to gestures. Both within and between species gesture usage varied enormously. Moreover, bonobos showed greater flexibility in this regard than chimpanzees and were also the only species in which multimodal communication (i.e., combinations of gestures and facial/vocal signals) added to behavioral impact on the recipient.
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Affiliation(s)
- Amy S. Pollick
- Living Links, Yerkes National Primate Research Center, Emory University, 954 North Gatewood Road, Atlanta, GA 30329
| | - Frans B. M. de Waal
- Living Links, Yerkes National Primate Research Center, Emory University, 954 North Gatewood Road, Atlanta, GA 30329
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35
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Jespersen SN, Kroenke CD, Østergaard L, Ackerman JJH, Yablonskiy DA. Modeling dendrite density from magnetic resonance diffusion measurements. Neuroimage 2007; 34:1473-86. [PMID: 17188901 DOI: 10.1016/j.neuroimage.2006.10.037] [Citation(s) in RCA: 243] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2006] [Accepted: 10/29/2006] [Indexed: 01/24/2023] Open
Abstract
Diffusion-weighted imaging (DWI) provides a noninvasive tool to probe tissue microstructure. We propose a simplified model of neural cytoarchitecture intended to capture the essential features important for water diffusion as measured by NMR. Two components contribute to the NMR signal in this model: (i) the dendrites and axons, which are modeled as long cylinders with two diffusion coefficients, parallel (D(L)) and perpendicular (D(T)) to the cylindrical axis, and (ii) an isotropic monoexponential diffusion component describing water diffusion within and across all other structures, i.e., in extracellular space and glia cells. The model parameters are estimated from 153 diffusion-weighted images acquired from a formalin-fixed baboon brain. A close correspondence between the data and the signal model is found, with the model parameters consistent with literature values. The model provides an estimate of dendrite density from noninvasive MR diffusion measurements, a parameter likely to be of value for understanding normal as well as abnormal brain development and function.
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Affiliation(s)
- Sune N Jespersen
- Center of Functionally Integrative Neuroscience, Aarhus University Hospital-Arhus Sygehus, Nørrebrogade 44, Building 30, 8000 Arhus C, Denmark.
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36
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Sherwood CC, Stimpson CD, Raghanti MA, Wildman DE, Uddin M, Grossman LI, Goodman M, Redmond JC, Bonar CJ, Erwin JM, Hof PR. Evolution of increased glia-neuron ratios in the human frontal cortex. Proc Natl Acad Sci U S A 2006; 103:13606-11. [PMID: 16938869 PMCID: PMC1564260 DOI: 10.1073/pnas.0605843103] [Citation(s) in RCA: 230] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Evidence from comparative studies of gene expression and evolution suggest that human neocortical neurons may be characterized by unusually high levels of energy metabolism. The current study examined whether there is a disproportionate increase in glial cell density in the human frontal cortex in comparison with other anthropoid primate species (New World monkeys, Old World monkeys, and hominoids) to support greater metabolic demands. Among 18 species of anthropoids, humans displayed the greatest departure from allometric scaling expectations for the density of glia relative to neurons in layer II/III of dorsolateral prefrontal cortex (area 9L). However, the human glia-neuron ratio in this prefrontal region did not differ significantly from allometric predictions based on brain size. Further analyses of glia-neuron ratios across frontal areas 4, 9L, 32, and 44 in a sample of humans, chimpanzees, and macaque monkeys showed that regions involved in specialized human cognitive functions, such as "theory of mind" (area 32) and language (area 44) have not evolved differentially higher requirements for metabolic support. Taken together, these findings suggest that greater metabolic consumption of human neocortical neurons relates to the energetic costs of maintaining expansive dendritic arbors and long-range projecting axons in the context of an enlarged brain.
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Affiliation(s)
- Chet C. Sherwood
- Department of Anthropology, The George Washington University, Washington, DC 20052
- To whom correspondence may be addressed at:
Department of Anthropology, The George Washington University, 2110 G Street NW, Washington, DC 20052. E-mail:
or
| | - Cheryl D. Stimpson
- Department of Anthropology, The George Washington University, Washington, DC 20052
| | - Mary Ann Raghanti
- Department of Anthropology and School of Biomedical Sciences, Kent State University, Kent, OH 44242
| | - Derek E. Wildman
- Center for Molecular Medicine and Genetics and
- Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI 48201
- Perinatology Research Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892
| | | | | | - Morris Goodman
- Center for Molecular Medicine and Genetics and
- Departments of Anatomy and Cell Biology and
- To whom correspondence may be addressed at:
Department of Anthropology, The George Washington University, 2110 G Street NW, Washington, DC 20052. E-mail:
or
| | - John C. Redmond
- Division of Neuroscience and Center for Behavioral Neuroscience, Yerkes National Primate Research Center, Emory University, Atlanta, GA 30329
| | | | - Joseph M. Erwin
- Foundation for Comparative and Conservation Biology, Needmore, PA 17238
| | - Patrick R. Hof
- Department of Neuroscience, Mount Sinai School of Medicine, New York, NY 10029; and
- New York Consortium in Evolutionary Primatology, New York, NY
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Choi HJ, Zilles K, Mohlberg H, Schleicher A, Fink GR, Armstrong E, Amunts K. Cytoarchitectonic identification and probabilistic mapping of two distinct areas within the anterior ventral bank of the human intraparietal sulcus. J Comp Neurol 2006; 495:53-69. [PMID: 16432904 PMCID: PMC3429851 DOI: 10.1002/cne.20849] [Citation(s) in RCA: 213] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Anatomical studies in the macaque cortex and functional imaging studies in humans have demonstrated the existence of different cortical areas within the intraparietal sulcus (IPS). Such functional segregation, however, does not correlate with presently available architectonic maps of the human brain. This is particularly true for the classical Brodmann map, which is still widely used as an anatomical reference in functional imaging studies. The aim of this cytoarchitectonic mapping study was to use previously defined algorithms to determine whether consistent regions and borders can be found within the cortex of the anterior IPS in a population of 10 post-mortem human brains. Two areas, the human intraparietal area 1 (hIP1) and the human intraparietal area 2 (hIP2), were delineated in serial histological sections of the anterior, lateral bank of the human IPS. The region hIP1 is located posterior and medial to hIP2, and the former is always within the depths of the IPS. The latter, on the other hand, sometimes reaches the free surface of the superior parietal lobule. The delineations were registered to standard reference space, and probabilistic maps were calculated, thereby quantifying the intersubject variability in location and extent of both areas. In the future, they can be a tool for analyzing structure-function relationships and a basis for determining degrees of homology in the IPS among anthropoid primates. We conclude that the human IPS has a more finely grained parcellation than shown in Brodmann's map.
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Affiliation(s)
- Hi-Jae Choi
- C. and O. Vogt Institut für Hirnforschung; Heinrich-Heine-Universität Düsseldorf, D-40001 Düsseldorf, Germany
| | - Karl Zilles
- C. and O. Vogt Institut für Hirnforschung; Heinrich-Heine-Universität Düsseldorf, D-40001 Düsseldorf, Germany
- Institute of Medicine and Brain Imaging Center West, Research Center Jülich, D-52425 Jülich, Germany
| | - Hartmut Mohlberg
- Institute of Medicine and Brain Imaging Center West, Research Center Jülich, D-52425 Jülich, Germany
| | - Axel Schleicher
- C. and O. Vogt Institut für Hirnforschung; Heinrich-Heine-Universität Düsseldorf, D-40001 Düsseldorf, Germany
| | - Gereon R. Fink
- Institute of Medicine and Brain Imaging Center West, Research Center Jülich, D-52425 Jülich, Germany
- Department of Neurology, RWTH Aachen University D-52074 Aachen, Germany
| | - Este Armstrong
- Institute of Medicine and Brain Imaging Center West, Research Center Jülich, D-52425 Jülich, Germany
| | - Katrin Amunts
- Institute of Medicine and Brain Imaging Center West, Research Center Jülich, D-52425 Jülich, Germany
- Department of Psychiatry and Psychotherapy, RWTH Aachen University, D-52074 Aachen, Germany
- Correspondence to: Prof. Katrin Amunts, Institut für Medizin, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany, Phone: +49-2461-61-4300; Fax: +49-2461-61-1518, E-mail:
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Uylings HBM, Rajkowska G, Sanz-Arigita E, Amunts K, Zilles K. Consequences of large interindividual variability for human brain atlases: converging macroscopical imaging and microscopical neuroanatomy. ACTA ACUST UNITED AC 2005; 210:423-31. [PMID: 16180019 DOI: 10.1007/s00429-005-0042-4] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
In human brain imaging studies, it is common practice to use the Talairach stereotaxic reference system for signifying the convergence of brain function and structure. In nearly all neuroimaging reports, the studied cortical areas are specified further with a Brodmann Area (BA) number. This specification is based upon macroscopic extrapolation from Brodmann's projection maps into the Talairach atlas rather than upon a real microscopic cytoarchitectonic study. In this review we argue that such a specification of Brodmann area(s) via the Talairach atlas is not appropriate. Cytoarchitectonic studies reviewed in this paper show large interindividual differences in 3-D location of primary sensory cortical areas (visual cortex) as well as heteromodal associational areas (prefrontal cortical areas), even after correction for differences in brain size and shape. Thus, the simple use of Brodmann cortical areas derived from the Talairach atlas can lead to erroneous results in the specification of pertinent BA. This in turn can further lead to wrong hypotheses on brain system(s) involved in normal functions or in specific brain disorders. In addition, we will briefly discuss the different 'Brodmann' nomenclatures which are in use for the cerebral cortex.
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Affiliation(s)
- H B M Uylings
- Netherlands Institute for Brain Research, Graduate School Neurosciences Amsterdam, Royal Netherlands Academy of Arts and Sciences, Meibergdreef 33, Amsterdam, AZ, 1105 The Netherlands.
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Triarhou LC. Georg N. Koskinas (1885-1975) and his scientific contributions to the normal and pathological anatomy of the human brain. Brain Res Bull 2005; 68:121-39. [PMID: 16325012 DOI: 10.1016/j.brainresbull.2005.08.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2005] [Revised: 07/24/2005] [Accepted: 08/23/2005] [Indexed: 11/20/2022]
Abstract
Georg N. Koskinas is invariably recognised by neuroanatomists as Constantin von Economo's co-author on the celebrated Die Cytoarchitektonik der Hirnrinde des erwachsenen Menschen, published 80 years ago in Vienna and Berlin. That text and Atlas are generally accepted as a monumental landmark in the evolution of morphological brain research. A number of neuroanatomists and neurophysiologists continue to use to this day the parcellation scheme of the cerebral cortex into 107 areas, proposed by von Economo and Koskinas (and logically denoted by alphabetical characters from the initials of the respective lobes), despite the commoner adoption of Brodmann's scheme of 52, randomly numbered, areas. Several works have been written about the life and work of von Economo; on the other hand, virtually nothing can be found in the biomedical literature about Koskinas. This study aims at posthumously restoring part of the fame due this illustrious man of 20th century science -- and giant figure of brain anatomy -- whom history has not treated in the fairest of ways. We present newly gathered biographical data, as well as lesser known aspects of his scientific productivity. Koskinas' neuropathological studies, in collaboration with Ernst Sträussler -- of Gerstmann-Sträussler-Scheinker disease fame -- include findings from patients inoculated with malaria as a form of therapy for progressive general paresis (research related to psychiatrist Wagner von Jauregg's 1927 Nobel Prize), colloid degeneration, and the laminar distribution of status spongiosus lesions. Koskinas' neuropsychiatric activities in Greece upon his return from Vienna in 1927, and until his parting in 1975, are further related, including his successful -- and "Hippocratic" -- practice in the suburbs of Athens, his association with the Vogt Institute for Brain Research at Neustadt, and lesser known neuroanatomical works.
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Affiliation(s)
- Lazaros C Triarhou
- Economo-Koskinas Wing for Integrative and Evolutionary Neuroscience, Department of Educational and Social Policy, and Program in Neuropsychology, University Research Institute, University of Macedonia, Thessaloniki 54006, Greece.
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Sherwood CC, Hof PR, Holloway RL, Semendeferi K, Gannon PJ, Frahm HD, Zilles K. Evolution of the brainstem orofacial motor system in primates: a comparative study of trigeminal, facial, and hypoglossal nuclei. J Hum Evol 2005; 48:45-84. [PMID: 15656936 DOI: 10.1016/j.jhevol.2004.10.003] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2004] [Revised: 10/01/2004] [Accepted: 10/05/2004] [Indexed: 11/19/2022]
Abstract
The trigeminal motor (Vmo), facial (VII), and hypoglossal (XII) nuclei of the brainstem comprise the final common output for neural control of most orofacial muscles. Hence, these cranial motor nuclei are involved in the production of adaptive behaviors such as feeding, facial expression, and vocalization. We measured the volume and Grey Level Index (GLI) of Vmo, VII, and XII in 47 species of primates and examined these nuclei for scaling patterns and phylogenetic specializations. Allometric regression, using medulla volume as an independent variable, did not reveal a significant difference between strepsirrhines and haplorhines in the scaling of Vmo volume. In addition, correlation analysis using independent contrasts did not find a relationship between Vmo size or GLI and the percent of leaves in the diet. The scaling trajectory of VII volume, in contrast, differed significantly between suborders. Great ape and human VII volumes, furthermore, were significantly larger than predicted by the haplorhine regression. Enlargement of VII in these taxa may reflect increased differentiation of the facial muscles of expression and greater utilization of the visual channel in social communication. The independent contrasts of VII volume and GLI, however, were not correlated with social group size. To examine whether the human hypoglossal motor system is specialized to control the tongue for speech, we tested human XII volume and GLI for departures from nonhuman haplorhine prediction lines. Although human XII volumes were observed above the regression line, they did not exceed prediction intervals. Of note, orang-utan XII volumes had greater residuals than humans. Human XII GLI values also did not differ from allometric prediction. In sum, these findings indicate that the cranial orofacial motor nuclei evince a mosaic of phylogenetic specializations for innervation of the facial muscles of expression in the context of a generally conservative scaling relationship with respect to medulla size.
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Affiliation(s)
- Chet C Sherwood
- Department of Anthropology and School of Biomedical Sciences, Kent State University, Kent, OH 44242, USA.
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41
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Sherwood CC, Holloway RL, Erwin JM, Hof PR. Cortical Orofacial Motor Representation in Old World Monkeys, Great Apes, and Humans. BRAIN, BEHAVIOR AND EVOLUTION 2004; 63:82-106. [PMID: 14685003 DOI: 10.1159/000075673] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2003] [Accepted: 08/27/2003] [Indexed: 11/19/2022]
Abstract
This study presents a comparative stereologic investigation of neurofilament protein- and calcium-binding protein-immunoreactive neurons within the region of orofacial representation of primary motor cortex (Brodmann's area 4) in several catarrhine primate species (Macaca fascicularis, Papio anubis, Pongo pygmaeus, Gorilla gorilla, Pan troglodytes, and Homo sapiens). Results showed that the density of interneurons involved in vertical interlaminar processing (i.e., calbindin- and calretinin-immunoreactive neurons) as well pyramidal neurons that supply heavily-myelinated projections (i.e., neurofilament protein-immunoreactive neurons) are correlated with overall neuronal density, whereas interneurons making transcolumnar connections (i.e., parvalbumin-immunoreactive neurons) do not exhibit such a relationship. These results suggest that differential scaling rules apply to different neuronal subtypes depending on their functional role in cortical circuitry. For example, cortical columns across catarrhine species appear to involve a similar conserved network of intracolumnar inhibitory interconnections, as represented by the distribution of calbindin- and calretinin-immunoreactive neurons. The subpopulation of horizontally-oriented wide-arbor interneurons, on the other hand, increases in density relative to other interneuron subpopulations in large brains. Due to these scaling trends, the region of orofacial representation of primary motor cortex in great apes and humans is characterized by a greater proportion of neurons enriched in neurofilament protein and parvalbumin compared to the Old World monkeys examined. These modifications might contribute to the voluntary dexterous control of orofacial muscles in great ape and human communication.
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Affiliation(s)
- Chet C Sherwood
- Department of Anthropology, Columbia University, New York, NY, USA.
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