Word: environmental
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Dates: during 1920-1929
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Heredity, Environment. That Alfred Emanuel Smith rose from utter poverty and the shelter of a saloon is another current myth. His father, for whom he was named, was a New York trucker of whom little is known except that he worked hard and died young, when his son was 13...
The lower animals rarely indulge in this form of biological sport, with the exception of the Texas armadillo* which reproduces regularly in this way. It bears four young of the same sex, having a common set of embryonic membranes, strikingly similar in general configuration, all coming from a single egg...
Psychological. Obviously twinship need have no mental effect on fraternal twins other than the general effect of being the same age and subject to similar environment.
Identical twins on the contrary are as alike mentally as physically whenever they are brought up together. Psychiatric literature is full of the case histories of identical twins stricken by the same psychoses at the same time. They have the same hallucinations, hear the same voices, suffer from the same...
* The behaviorists claim that all behavior, no matter how complicated or idealistic, is the effect of the environment on the unconditioned reflexes. Chief exponent of behaviorism-John Broadus Watson.