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M ENTAL deterioration has been defined by Wechsler [5] as follows:By mental we shall mean primarily intellectual abilities, and by deterioration any conspicuous falling off or loss in these abilities. Concretely a person will be considered as giving evidence of mental deterioration when he is no longer able to carry on his intellectual tasks with the speed, accuracy or efficiency previously characteristic of his functioning level.He has explicitly claimed that mental deterioration as measured by his test is applicable to the schizophrenic process.The method just described . . . may also be applied in cases of Schizophrenia. Here special considerations arising from the peculiarities in test patterning of this group must be borne in mind.