Speech Perception Deficits in Poor Readers

Abstract

We reply to Denenberg's (1999) recent critique of our work (Mody, Studdert-Kennedy, & Brady, 1997). Denenberg mounted two main lines of criticism, one concerning characteristics of the population sampled for the experimental group, and the other a statistical critique, concerning (a) violation of parametric assumptions for use of the F distribution and (b) our supposed acceptance of the null hypothesis of no differences between experimental and control groups. We show that the first criticism stemmed from a misunderstanding of the experimental hypothesis and that the second can be answered by both parametric and nonparametric comparisons across conditions within the experimental group, without reference to the control group. Thus, our original conclusion stands: The difficulty with rapid /ba/-/da/ discrimination that some children with reading impairment may experience does not stem from difficulty in discriminating the rapid spectral transitions at stop-vowel syllable onsets.

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References

Best, C.T. , Avery, R.A. (1999). Left hemisphere advantage for click consonants is determined by linguistic significance and experience. Psychological Science, 10, 65-70.

Bishop, D.V.M. , Carlyon, R.P. , Deeks, J.M. , & Bishop, S.J. (1999). Auditory temporal processing impairment: Neither necessary nor sufficient for causing language impairment in children. Journal of Speech, Language, and Hearing Research, 42, 1295-1310.

Bradlow, A.R. , Kraus, N. , Nicol, T.G. , McGee, T.J. , Cunningham, J. , Zecker, S.G. , & Carrell, T.D. (1999). Effects of lengthened formant transition duration on discrimination and neural representation of synthetic CV syllables by normal and learning-disabled children. Journal of the Acoustical Society of America, 106, 2086-2096.

Denenberg, V.H. (1999). A critique of Mody, Studdert-Kennedy, and Brady's "Speech Perception Deficits in Poor Readers: Auditory Processing or Phonological Coding?" Journal of Learning Disabilities, 32, 379-383.

Ferguson, G.A. (1981). Statistical analysis in psychology and education (5th ed.). New York: McGraw Hill.

Lindquist, E.F. (1953). Design and analysis of experiments in psychology and education. Boston: Houghton Mifflin.

McAnally, K.I. , Hansen, P.C. , Cornelissen, P.L. , & Stein, J.F. (1997). Effect of time and frequency manipulation on syllable perception in developmental dyslexics. Journal of Speech, Language, and Hearing Research, 40, 912-924.

Mody, M. (1993). Bases of reading impairment in speech perception: A deficit in rate of auditory processing or in phonological coding? Unpublished doctoral dissertation, City University of New York.

Mody, M. , Studdert-Kennedy, M. , & Brady, S. (1997). Speech perception deficits in poor readers: Auditory processing or phonological coding? Journal of Experimental Child Psychology, 64, 199-231.

10.

Nittrouer, S. (1999). Do temporal processing deficits cause phonological processing problems? Journal of Speech, Language, and Hearing Research, 42, 925-942.

11.

Reed, M.A. (1989). Speech perception and the discrimination of brief auditory cues in reading disabled children. Journal of Experimental Child Psychology, 48, 270-292.

12.

Shaywitz, S.E. , Escobar, M.D. , Shaywitz, B.A. , Fletcher, J.M. , & Makuch, R. (1992). Evidence that dyslexia may represent the lower tail of the normal distribution of reading ability. New England Journal of Medicine, 326, 145-150.

13.

Stanovich, K.E. , & Siegel, L.S. (1994). Phenotypic performance profile of children with reading disabilities: A regression-based test of the phonological-core variable-difference model. Journal of Educational Psychology, 86, 24-53.

14.

Studdert-Kennedy, M. , & Mody, M. (1995). Auditory temporal perception deficits in the reading-impaired: A critical review of the evidence. Psychonomic Bulletin & Review, 2, 508-514.

15.

Tallal, P. (1980). Auditory temporal perception, phonics and reading disabilities in children. Brain and Language, 9, 182-198.

16.

Tallal, P. (1999). Children with language impairment can be accurately identified using temporal processing measures: A response to Zhang and Tomblin. Brain and Language, 69, 222-229.

17.

Tallal, P. , & Piercy, M. (1973). Developmental aphasia: Impaired rate of nonverbal processing as a function of sensory modality. Neuropsychologia , 11, 389-398.

18.

Tallal, P. , & Piercy, M. (1974). Developmental aphasia: Rate of auditory processing and selective impairment of consonant perception. Neuropsychologia , 12, 83-93.

19.

Tallal, P. , & Piercy, M. (1975). Developmental aphasia: The perception of brief vowels and extended stop consonants. Neuropsychologia, 13, 69-74.

20.

Tallal, P. , Stark, R.L. , & Mellits, E. (1985). Identification of language-impaired children on the basis of rapid perception and production skills. Brain and Language, 25, 314-322.