Auditory performance characteristics of the Computerized Revised Token Test (CRTT).
OBJECTIVE
To assess the Computerized Revised Token Test (CRTT) performance of individuals with normal hearing under several intensity conditions and under several spectral and temporal perturbation conditions.


METHODS
Sixty normal-hearing listeners were randomly assigned to 1 of 3 groups. Group 1 provided performance-intensity information about CRTT performance using uncompressed acoustic stimuli. Groups 2 and 3 completed the CRTT using temporally and spectrally compressed and expanded stimuli. CRTT performance functions were plotted for each group.


RESULTS
Group 1 required minimal audibility to perform maximally on this task. As expected, Groups 2 and 3 showed significant differences across subtests, regardless of distortion condition. Mean differences in performance between successive conditions for Group 2 increased beyond 40% time compressed. There was 1 significant difference for the time-expanded condition. There were no differences across frequency compressed and expanded conditions.


CONCLUSIONS
Young listeners require limited signal gain on the CRTT to achieve maximum performance. Time and frequency compression and expansion results were consistent with previous findings with varying types of speech stimuli. The results have implications for administration and interpretation of the CRTT administered to persons from other populations and will help in the development of a normative database for the CRTT.
VA Pittsburgh Healthcare System, Audiology and Speech Pathology, 7180 Highland Drive, Pittsburgh, PA 15206, USA. Cynthia.Eberwein@va.gov
Cynthia A
CA
Eberwein
Sheila R
SR
Pratt
Malcolm R
MR
McNeil
Tepanta R D
TR
Fossett
Neil J
NJ
Szuminsky
Patrick J
PJ
Doyle
D000161:Acoustic Stimulation / Q000379:methods*; D000328:Adult; D001037:Aphasia / Q000175:diagnosis*; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D005260:Female; D006309:Hearing; D006801:Humans; D007806:Language Disorders / Q000175:diagnosis*; D008297:Male; D012720:Severity of Illness Index; D013067:Speech Perception