Affiliation:
1. The Royal Victorian Eye and Ear Hospital, Melbourne, Australia
Abstract
Modified instrumentation for pure-tone delayed auditory feedback (DAF) is described. This equipment, which achieves considerable simplification over previous designs, retains tapping-pressure changes as an indication of performance disruption under DAF. A specially constructed key unit serves to connect a pure-tone signal to an earphone through a tape recorder fitted with separate record and playback heads. The key-tapping unit also incorporates a pressure transducer (carbon granules capsule) which acts as one arm of a wheatstone pseudobridge. Hence resistance changes in the balance of the bridge are converted to stylus deflections on a graphic recorder.
Publisher
American Speech Language Hearing Association