Abstract
The question, to which extend the ear is able to discriminate and follow random temporal changes of sound pressure level (SPL) is studied. For this purpose experiments are designed to determine the dynamic difference limen (DDL) for intensity, that is, intensity discrimination for sounds whose SPLs change with time. The psychophysical methods which have been used commonly in previous studies cannot be applied to measure DDL. The first problem of the present study, therefore, is to develop an appropriate method for DDL measurement. Three experiments are performed and larger values of DDLs are obtained than DLs for steady-state stimulus.
