Auditory frequency discriminatior in adult developmental dyslexics

S. J. France, B. S. Rosner*, P. C. Hansen, C. Calvin, J. B. Talcott, A. J. Richardson, J. F. Stein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Developmental dyslexics reportedly discriminate auditory frequency poorly. A recent study found no such deficit. Unlike its predecessors, however, it employed multiple exposures per trial to the standard stimulus. To investigate whether this affects frequency discrimination in dyslexics, a traditional two-interval same-different paradigm (2I_1A_X) and a variant with six A-stimuli per trial (2I_6A_X) were used here. Frequency varied around 500 Hz; interstimulus interval (ISI) ranged between 0 and 1,000 msec. Under 2I_1A_X, dyslexics always had larger just noticeable differences (JNDs) than did controls. Dyslexic and control JNDs were equal at shorter ISIs under 2I_6A_X, but dyslexics became worse than controls at longer ISIs. Signal detection analysis suggests that both sensory variance and trace variance are larger in dyslexics than in controls.

Original languageEnglish
Pages (from-to)169-179
Number of pages11
JournalPerception and Psychophysics
Issue number2
Publication statusPublished - 1 Feb 2002


  • Digit Span
  • Poor Reader
  • Dyslexia
  • Weber Fraction
  • Frequency Discrimination


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