Auditory Frequency Discrimination in Adults With Dyslexia: A Test of the Anchoring Hypothesis PurposeA recent hypothesis ascribes dyslexia to a perceptual anchoring deficit. Supporting results have so far been obtained only in children with dyslexia and additional learning difficulties, but the hypothesis has been argued to apply to all individuals with dyslexia.MethodThe authors measured auditory frequency discrimination thresholds in 54 young adults (native ... Research Note
Research Note  |   October 01, 2012
Auditory Frequency Discrimination in Adults With Dyslexia: A Test of the Anchoring Hypothesis
 
Author Affiliations & Notes
  • Frank Wijnen
    Utrecht University, the Netherlands
  • Astrid M. L. Kappers
    Utrecht University, the Netherlands
  • Leoni D. Vlutters
    Utrecht University, the Netherlands
  • Sven Winkel
    Utrecht University, the Netherlands
  • Correspondence to Frank Wijnen: F.N.K.Wijnen@uu.nl
  • Editor: Robert Schlauch
    Editor: Robert Schlauch×
  • Associate Editor: Beverly Wright
    Associate Editor: Beverly Wright×
Article Information
Hearing & Speech Perception / Acoustics / Language Disorders / Reading & Writing Disorders / Hearing
Research Note   |   October 01, 2012
Auditory Frequency Discrimination in Adults With Dyslexia: A Test of the Anchoring Hypothesis
Journal of Speech, Language, and Hearing Research, October 2012, Vol. 55, 1387-1394. doi:10.1044/1092-4388(2012/10-0302)
History: Received October 29, 2010 , Revised May 6, 2011 , Accepted January 12, 2012
 
Journal of Speech, Language, and Hearing Research, October 2012, Vol. 55, 1387-1394. doi:10.1044/1092-4388(2012/10-0302)
History: Received October 29, 2010; Revised May 6, 2011; Accepted January 12, 2012
Web of Science® Times Cited: 1

PurposeA recent hypothesis ascribes dyslexia to a perceptual anchoring deficit. Supporting results have so far been obtained only in children with dyslexia and additional learning difficulties, but the hypothesis has been argued to apply to all individuals with dyslexia.

MethodThe authors measured auditory frequency discrimination thresholds in 54 young adults (native speakers of Dutch; 25 individuals with dyslexia; 29 age- and education-matched controls), with a 2-alternative forced-choice staircase paradigm. There were 2 conditions: 1 in which 1 tone in each pair had a fixed frequency across trials (standard), and 1 in which both tones varied in frequency (no standard). Presence of a standard stimulus allows the creation of a stimulus-specific representation in short-term-memory (perceptual anchor).

ResultsThe standard condition yielded significantly lower discrimination thresholds in both controls and individuals with dyslexia; both groups benefited equally from the presence of an invariant stimulus.

ConclusionThere is no difference between this group of adults with dyslexia and controls in their capacity to form a perceptual anchor. The implication is that an anchoring deficit cannot be generalized to all cases of dyslexia.

Acknowledgments
This work was supported by grants from the Netherlands Organization for Scientific Research. The first and second authors designed the study, did the final analyses, and wrote the paper; they contributed equally. The third and fourth authors were responsible for participant recruitment, data collection, and first analyses.
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