Granger (1953) and Eysenck (1950) proposed the view that even tests of simple perceptual functions should prove valuable in assessing the pertinent variables underlying the development of a science of personality. Although Allport (1937) took exception to this view, Eysenck, Granger, and Brengelman (1957) compiled considerable experimental evidence in which both simple and complex perceptual tasks differentiated the normal, the neurotic, and the psychotic from each other. The data are valid for groups and are not predictive of individual cases at the present time. Perceptual tests offer objective laboratory data to augment or supplement the armamentarium of the clinician who must rely largely on ordinal scale measurements.
Conditionability and Personality
Conditionability as a criterion of personality function has been examined experimentally and observed clinically with positive results. Travis (1924) was able to show that the auditory threshold fluctuated in a systematic manner
KODMAN F. Auditory Incompatibility in Catatonic Schizophrenia. Arch Gen Psychiatry. 1961;4(4):390-394. doi:10.1001/archpsyc.1961.01710100070008