A computer-controlled system for the recording modification and presentation of two-channel musical stimuli

This paper describes a computer-based system for the on-line experimental use of musical stimuli. The system is in two sections. The first records in digital form two successive monophonie keyboard performances and combines them into a two-part musical stimulus consisting of bass and treble melodic lines. This musical stimulus can be modified in one or more ways by means of an editing program. The second part of the system presents the modified stimulus to the subject and records his reaction time to particular target notes. The system can be expanded to allow the merging of a larger number of melodic lines into a single polyphonic form or can be modified to produce precisely controlled two-channel tonal stimuli.