ISSN:0012-1630    

DOI:10.1002/dev.420030102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1970

数据来源: WILEY

ISSN:0012-1630    

DOI:10.1002/dev.420030103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1970

数据来源: WILEY

摘要:

AbstractLaboratory‐raised rhesus monkeys ranging in age from 3 to 25 months were tested for reactions to toys representing animals (“fear stimuli”) and to food frustration. The results indicate that these test conditions are associated with different response profiles and that the contrast between responses to fear and to frustration increases with age. Frustration in older animals is associated with regression to a less mature level of functi

ISSN:0012-1630    

DOI:10.1002/dev.420030104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1970

数据来源: WILEY

摘要:

AbstractAppearance, concentration, and distribution of catecholamines (dopamine and norepinephrine) in embryonic and postnatal chick brain regions were studied. The highest amount of DA was found in cerebral hemispheres and increased gradually to adult levels, whereas in other parts of the brain the concentrations of DA fluctuated during the post‐hatch period. The remainder contained the largest amount of NE, whereas the cerebral hemispheres contained relatively small amounts of NE. Relatively high amounts of NE were found in the cerebellum. A single dose of L‐3, 4‐dihydroxyphenylalanine (DOPA) injected into the 3‐day‐old embryo had no significant effect upon the levels of DA and NE either in the embryonic stages or in the postnatal period. In the 7‐day‐old chick, combined treatment of JB‐516 (catron) and L‐DOPA (IP) induced about a 10‐fold and 2‐fold increase of the brain level of DA and NE respectively about 30 min after injection, and these levels decreased rather rapidly within 2 hr. A group of chicks injected with DOPA at the 3‐day‐old embryonic stage and a group injected with saline were exposed one month post‐hatch to three visual discrimination tasks. There was no significant difference in the performan

ISSN:0012-1630    

DOI:10.1002/dev.420030105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1970

数据来源: WILEY

摘要:

AbstractEight infant monkeys with a mean age of 67 days, range 50 to 84, and 8 adult monkeys were trained to discriminate an equilateral triangle from a circle. After reaching the criterion of learning, they were subjected to a series of transfer tests containing 20 different stimulus pairs. The groups did not differ significantly in rate of learning or transfer scores. Adults showed significant interproblem transfer to stimuli that had high generalization scores in other studies. Significant transfer was found to outline figures, intensity reversal and no consistent effect in responses to the sides of the triangle as opposed to the angles appeared.

ISSN:0012-1630    

DOI:10.1002/dev.420030106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1970

数据来源: WILEY

摘要:

AbstractMother and infant squirrel monkeys that lived together in a socially restricted environment were separated for a period of seven days after the infants had become relatively independent, and were then reunited. Behavioral observations before, during, and after separation indicated that(1)female infants became independent of their mothers earlier than males,(2)neither mothers nor infants were severely affected by separation, and(3)an increase in attachment occurred following reunion only when the mother had a limited history of maternal experience. These results suggest that(1)certain characteristics in the maternal behavior of the squirrel monkey facilitate readjustment in mothers and infants following maternal separation,(2)maternal experience can influence the mother‐infant relationship following a period of separation, and(3)the independence of infants from their mothers may be a function of both sex and specie

ISSN:0012-1630    

DOI:10.1002/dev.420030107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1970

数据来源: WILEY

摘要:

AbstractThe level of endogenous cyclic AMP in the rat brainin vivobegan to increase markedly between the third and sixth days after birth, as did the ability of norepinephrine to stimulate the formation of cyclic AMP in brain tissuein vitro.Adenyl cyclase activity in broken cell preparations, when measure in the absence of sodium fluoride, increased with age up to a point, but began to decline between the fifth and ninth days postpartum. Activity continued to increase when measured in the presence of fluoride, suggesting that the apparent stimulatory effect of this ion may in fact be the reversal of an inhibitory influence which is absent or almost absent at birth. Cyclase activity at all ages was restricted to particulate matter, whereas apparent phosphodiesterase activity was present in particulate as well as soluble fractions. The catabolic system for cyclic AMP developed in a similar manner in both fractions. Theophylline produced the same degree of inhibition of this system at all ages.

ISSN:0012-1630    

DOI:10.1002/dev.420030108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1970

数据来源: WILEY

ISSN:0012-1630    

DOI:10.1002/dev.420030109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1970

数据来源: WILEY

ISSN:0012-1630    

DOI:10.1002/dev.420030101

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1970

数据来源: WILEY