In recent years there have been an increasing number of studies concerned with the effects of early experience on later behavior and development in animals. The relevant literature has been reviewed by several investigators.1,3,4,7,12,15 As Bovard and Newton4 have pointed out, part of the impetus for this type of research has had its origin in the Freudian hypothesis that early experiences are of critical significance in the genesis of personality structure. The thesis forwarded in this paper is that certain hypotheses regarding the effects of early experience on human behavior may be amenable to corroboration at the animalexperimental level. One type of early experience, the effects of which have been subject to minimal experimental investigations, is that concerned with the organism's prolonged living experience with the mother following its normal weaning period. Bovard and Newton4 have reported that albino rats
ROSEN J, WEJTKO J. Effects of Delayed Weaning on Rat EmotionalityRelated to Dominance Behavior in the Rat. Arch Gen Psychiatry. 1962;7(2):77–81. doi:10.1001/archpsyc.1962.01720020001001
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