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  • 1
    ISSN: 0032-8332
    Keywords: Chimpanzee ; Rhesus ; Joystick ; Video ; Learning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In order to study the effects of the mothers' range of action on the development of their infants' range of action during the first year of life, mother cynomolgus monkeys were restrained in their range of action by penning them in a separation cage within the large cage of the harem group they belonged to. The infants, however, could leave their mothers' separation cage. The control group consisted of infants growing up with unrestrained mothers in the same group. It appeared that infants of restrained mothers were initially retarded in the development of their range of action but at the end of the first year they did not differ anymore from infants of unrestrained mothers. It is concluded that the maternal range of action only temporarily affects the development of the infant's range of action.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0032-8332
    Keywords: Macaca fascicularis ; Mobile surrogates ; Development ; Neophobia ; Exploration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In search of the relevant difference between mother rearing and surrogate rearing with respect to the emergence of neophobic behavior in macaques, we tested the hypothesis that mobility of surrogate mothers prevents the development of neophobic behavior in cynomolgus macaques. The experimental group consisted of ten surrogate-reared subjects which during their first year got rides on surrogate mothers moving through the cage. The control group consisted of nine subjects reared with immobile surrogate mothers. Between the age of 7 and 27 months the reactions to two different novel objects were tested. First exposure to one object occurred at 6 months of age and to the other object at 20 months. The kind of object and the age of first exposure made no difference. Contrary to our expectations mobility of surrogates did not affect the incidence of neophobia: most subjects in both groups persistently avoided the objects. This finding seems to support Hofer's hypothesis that the mother acts as a regulator of the infant's behavior and physiology.
    Type of Medium: Electronic Resource
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