Abstract
The multimethod-multitrait matrix applied to the study of sensitivity. The psychophysic scaling has several sensitivity mesaurements that have been classified in different groups as, i.e. those that derived of the Stevens model. Pr evious researchs (Villarino, Garriga-Trillo & Rodríguez-Miñón, 1992; Villarino & Garriga-Trillo, 1995) have compared these measurement of sensitivity and have found high correlations in the measures derived of Stevens model, but low correlations when another models are considered (Signal Detection Theory and Information Theory). These results could suggest that these measurements do not measure the same. The main objective of present work is to approach study of reliability and validity of Stevens's exponent as measurement of sensitivity through multimethod-multitrait matrix. Though this procedure has been used for validation of psychological tests, it never has been applied in the psychophysic field. In this investigation area , the application of this procedure involve the evaluation of different sensory kind (view-sight, hearing, touch-tact, etc.) or, in our case, es timation of several dimensions (length, area, brightness, etc.) through different procedures of data obtaining (absolute magnitude estimation, and magnitude estimation with several standard stimuli).
