I. INTRODUCTIONSeveral authors surveying literature pertinent to the area of psychosurgery (g, 10, 11, 13, 18, 22) have generally concurred in three principal conclusions: first, that there is disagreement among experimenters regarding the effect which prefrontal lobotomy has on those functions which psychological tests are designed to measure; second, that certain important psychological variables have been neglected in the various studies; and third, that there is considerable discrepancy between interpretations of test data and clinical impression. The present writers, as a result of their own review of the experimental literature, wish to add a fourth criticism. It is apparent that several investigators have failed to consider basic methodological issues in evolving their experimental procedures. The
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