Seashore Rhythm test: comparison of Signal Detection Theory and standard scoring procedures.

The effects of age and instructional set on Seashore Rhythm test performance were examined with standard scoring and Signal Detection Theory (SDT) procedures. Neurologically intact young (17-28 years) and old (65-92 years) subjects were given standard test instructions with sentences added which stated that specific proportions of the test stimuli would be identical or different. Age differences in d' scores were highly correlated with standard Rhythm scores. While standard scores were unaffected by instructional set, all three SDT measures of response criteria detected effects of instructional set, or an age by instructional set interaction. SDT scoring of the Rhythm test yields a measure of auditory sensitivity comparable to standard methods and detects response bias on the lest that standard procedures cannot.