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Raghanti MA, Edler MK, Stephenson AR, Munger EL, Jacobs B, Hof PR, Sherwood CC, Holloway RL, Lovejoy CO. A neurochemical hypothesis for the origin of hominids. Proc Natl Acad Sci U S A 2018; 115:E1108-E1116. [PMID: 29358369 PMCID: PMC5819450 DOI: 10.1073/pnas.1719666115] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
It has always been difficult to account for the evolution of certain human characters such as language, empathy, and altruism via individual reproductive success. However, the striatum, a subcortical region originally thought to be exclusively motor, is now known to contribute to social behaviors and "personality styles" that may link such complexities with natural selection. We here report that the human striatum exhibits a unique neurochemical profile that differs dramatically from those of other primates. The human signature of elevated striatal dopamine, serotonin, and neuropeptide Y, coupled with lowered acetylcholine, systematically favors externally driven behavior and greatly amplifies sensitivity to social cues that promote social conformity, empathy, and altruism. We propose that selection induced an initial form of this profile in early hominids, which increased their affiliative behavior, and that this shift either preceded or accompanied the adoption of bipedality and elimination of the sectorial canine. We further hypothesize that these changes were critical for increased individual fitness and promoted the adoption of social monogamy, which progressively increased cooperation as well as a dependence on tradition-based cultural transmission. These eventually facilitated the acquisition of language by elevating the reproductive advantage afforded those most sensitive to social cues.
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Affiliation(s)
- Mary Ann Raghanti
- Department of Anthropology, Kent State University, Kent, OH 44242;
- School of Biomedical Sciences, Kent State University, Kent, OH 44242
| | - Melissa K Edler
- Department of Anthropology, Kent State University, Kent, OH 44242
- School of Biomedical Sciences, Kent State University, Kent, OH 44242
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272
| | - Alexa R Stephenson
- Department of Anthropology, Kent State University, Kent, OH 44242
- School of Biomedical Sciences, Kent State University, Kent, OH 44242
| | - Emily L Munger
- Department of Anthropology, Kent State University, Kent, OH 44242
- School of Biomedical Sciences, Kent State University, Kent, OH 44242
| | - Bob Jacobs
- Laboratory of Quantitative Neuromorphology, Department of Psychology, Colorado College, Colorado Springs, CO 80903
| | - Patrick R Hof
- Fishberg Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029
- New York Consortium in Evolutionary Primatology, New York, NY 10024
| | - Chet C Sherwood
- Department of Anthropology, The George Washington University, Washington, DC 20052
- Center for the Advanced Study of Human Paleobiology, The George Washington University, Washington, DC 20052
| | - Ralph L Holloway
- Department of Anthropology, Columbia University, New York, NY 10027
| | - C Owen Lovejoy
- Department of Anthropology, Kent State University, Kent, OH 44242;
- School of Biomedical Sciences, Kent State University, Kent, OH 44242
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Afanas'ev SV, Tolkunov BF, Orlov AA, Selezneva EV. Collective responses of neostriatal (putamen) neurons during alternative behavior in monkeys. NEUROSCIENCE AND BEHAVIORAL PHYSIOLOGY 1998; 28:231-7. [PMID: 9682226 DOI: 10.1007/bf02462951] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A monkey (Macaca nemestrina) was trained to perform a behavioral program consisting of the selection and execution of a defined sequence of actions according to a visual conditioned signal. Discriminant analysis was used to evaluate the parameters of the collective activity of six simultaneously recorded putamen neurons. The collective activity of the neurons showed significant differences associated with execution by the monkey of left- and right-sided tasks. These differences were seen to be quite consistent in different groups of neurons. Despite the fact that putamen neurons were involved in the performance of nine separately analyzed fragments of the program, differences were seen in two of these: at the moment of taking the decision relating to the direction of movement, and after its completion when a signal indicating the completed result was presented, independently of whether the animal selected the side for the action correctly or incorrectly. In the case of erroneous decisions, the response mosaic differed from that obtained for correct decisions; however, differences due to previously taken decisions regarding the side of action were preserved. These differences were greater at the point of program completion than at the moment of deciding the direction of movement.
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Affiliation(s)
- S V Afanas'ev
- Laboratory for the Integrative Functions of the Brain, I. M. Sechenov Institute of Evolutionary Biochemistry and Physiology, Russian Academy of Sciences, St. Petersburg, Russia
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Yeterian EH, Pandya DN. Striatal connections of the parietal association cortices in rhesus monkeys. J Comp Neurol 1993; 332:175-97. [PMID: 8331211 DOI: 10.1002/cne.903320204] [Citation(s) in RCA: 139] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The corticostriatal connections of the parietal association cortices were examined by the autoradiographic technique in rhesus monkeys. The results show that the rostral portion of the superior parietal lobule projects predominantly to the dorsal portion of the putamen, whereas the caudal portion of the superior parietal lobule and the cortex of the upper bank of the intraparietal sulcus have connections with the caudate nucleus as well as with the dorsal portion of the putamen. The medial parietal convexity cortex projects strongly to the caudate nucleus, and has less extensive projections to the putamen. In contrast, the medial parietal cortex within the caudal portion of the cingulate sulcus projects predominantly to the dorsal portion of the putamen, and has only minor connections with the caudate nucleus. The rostral portion of the inferior parietal lobule projects mainly to the ventral sector of the putamen, and has only minor connections with the caudate nucleus. The middle portion of the inferior parietal lobule has sizable projections to both the putamen and the caudate nucleus. The caudal portion of the inferior parietal lobule as well as the lower bank of the intraparietal sulcus project predominantly to the caudate nucleus, and have relatively minor connections with the putamen. The cortex of the parietal opercular region also shows a specific pattern of corticostriatal projections. Whereas the rostral portion projects exclusively to the ventral sector of the putamen, the caudal portion has connections to the caudate nucleus as well. Thus, it seems that parietostriatal projections show a differential topographic distribution; within both the superior and the inferior parietal region, as one progresses from rostral to caudal, there is a corresponding shift in the predominance of projections from the putamen to the caudate nucleus. In addition, with regard to the projections to the putamen, the superior parietal lobule is related mainly to the dorsal portion, and the inferior parietal lobule to the ventral portion. The striatal projections of the cortex of the caudal portion of the cingulate gyrus (corresponding in part to the supplementary sensory area) and of the rostral parietal opercular region (corresponding in part to the second somatosensory area) are directed almost exclusively to the dorsal and ventral sectors of the putamen, respectively. This pattern resembles that of the primary somatosensory cortex. The results are discussed with regard to the overall architectonic organization of the posterior parietal region. Possible functional aspects of parietostriatal connectivity are considered in the light of physiological and behavioral studies.
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Affiliation(s)
- E H Yeterian
- Department of Psychology, Colby College, Waterville, Maine 04901
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Ploeger GE, Spruijt BM, Cools AR. Effects of haloperidol on the acquisition of a spatial learning task. Physiol Behav 1992; 52:979-83. [PMID: 1484855 DOI: 10.1016/0031-9384(92)90380-k] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The effects of systemic injections of the dopaminergic antagonist haloperidol on the acquisition of the Morris water maze with either a visible or an invisible platform (nonspatial vs. spatial learning) were investigated. An open field test was used for selecting a dosage (< or = 0.1 mg/kg), that (hardly) affected locomotor behaviour. Differential effects were found. At 0.1 mg/kg, haloperidol reduced locomotion in the open field, impaired acquisition in the Morris maze with a visible platform, and blocked escape onto an invisible one. Even though 0.07 mg/kg haloperidol reduced locomotion, both 0.04 and 0.07 mg/kg only impaired Morris maze performance in the spatial version. A large effect was found in the first trial of every day's training block. These results indicate that haloperidol at low doses can lead to a moderate but significant impairment of spatial learning. It is suggested that the effects found are related to the function of the striatal areas in cue- and noncue-directed behaviour.
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Affiliation(s)
- G E Ploeger
- Institute of Molecular Biology, and Medical Biotechnology, University of Utrecht, The Netherlands
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Rupniak NM, Tye SJ, Steventon MJ, Boyce S, Iversen SD. Spontaneous orofacial dyskinesias in a captive cynomolgus monkey: implications for tardive dyskinesia. Mov Disord 1990; 5:314-8. [PMID: 2259355 DOI: 10.1002/mds.870050410] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
We describe a syndrome of spontaneous orofacial dyskinesias and cage stereotypies in a singly housed adult cynomolgus monkey never previously exposed to neuroleptic drugs. Abnormal movements were readily suppressed by acute treatment with haloperidol (0.03-0.24 mg/kg i.m.) or SCH23390 (0.05-0.2 mg/kg i.m.) but not by physostigmine (0.005-0.04 mg/kg i.m.) or scopolamine (0.0025-0.04 mg/kg i.m.). The symptomatology and response to pharmacological manipulations was indistinguishable from that previously attributed to chronic neuroleptic treatment in primates. Our findings indicate that neuroleptic-induced tardive dyskinesias in most primate studies have not been clearly demonstrated.
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Affiliation(s)
- N M Rupniak
- Merck Sharp and Dohme Research Laboratories, Neuroscience Research Centre, Harlow, Essex, England
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Berger HJ, van Hoof JJ, van Spaendonck KP, Horstink MW, van den Bercken JH, Jaspers R, Cools AR. Haloperidol and cognitive shifting. Neuropsychologia 1989; 27:629-39. [PMID: 2544823 DOI: 10.1016/0028-3932(89)90109-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In this study haloperidol appeared to affect the performance on a selected category of cognitive tasks considered to represent shifting aptitude. A pretest--post-test design was used with two groups of subjects: 17 patients suffering from idiopathic spasmodic torticollis, and 17 controls who were matched for age and intelligence. The results are discussed in relation to previous findings on haloperidol and cognition, shifting disorder in Parkinson's disease and changes in behavioural organization found in animals with an experimentally induced dopaminergic hypoactivity.
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Affiliation(s)
- H J Berger
- Department of Medical Psychology, University of Nijmegen, The Netherlands
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