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In psychological examinations made at the Psychopathic Hospital it has for some time seemed evident to the examiners that the majority of patients over 50 years of age do especially poorly in the tests of memory and in certain allied tests.Casual observation and another study 2 showed further that this deficiency depends relatively little upon type of mental disease and relatively much upon chronological age.The present paper is an account of our attempt to find reasons and numerical expression for the differences among our patients.We have attempted also to check our results by studying the influence of chronological age in the case of normal persons. Cases Used and Their ComparabilityThe following groups of cases have been studied.No foreign-speaking adults and no children of foreign-speaking parents are included in any group.(a) 106 older 3 patients in a large general hospital in Boston (not an insane hospital).76 per cent of this group are men So far as our problem 3 Our thanks are due to the following physicians whose cooperation
Foster et al. (Mon,) studied this question.