J Am Acad Audiol 2002; 13(08): 438-460
DOI: 10.1055/s-0040-1716007
American Academy of Audiology. All rights reserved. (2002) American Academy of Audiology

Behavioral and Electrophysiologic Evidence of Auditory Processing Disorder: A Twin Study

James Jerger
Linda Thibodeau
Jeffrey Martin
Jyutika Mehta
Gail Tillman
Ralf Greenwald
Lana Britt
Jack Scott
Gary Overson
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Publication History

Publication Date:
07 August 2020 (online)

We administered a battery of both behavioral and electrophysiologic measures to a pair of fraternal twin girls, one of whom exhibited symptoms consistent with an auditory processing disorder. Both twins were within normal limits on standardized tests of cognitive and language skills. Basic audiometric measures, as well as behavioral tests of simultaneous masking, backward masking, gap detection, and frequency-sweep discrimination, showed little difference between the twins. Significant differences, however, were evident on event-related potentials (ERPs) in response to both within-channel and across-channel gap detection tasks. Substantial differences were also noted for ERPs to both linguistic and nonlinguistic targets in dichotic listening paradigms. The pattern of electrophysiologic results was consistent with a deficit in the efficiency of interhemispheric transfer of auditory information. A possible reason for the greater effectiveness of electrophysiologic over behavioral measures is discussed.