14th International Congress of Phonetic Sciences (ICPhS-14)

San Francisco, CA, USA
August 1-7, 1999

Phoneme Boundary Perception in Relationship to Developmental Dyslexia

C. E. Schwippert (1), Florien J. Koopmans-van Beinum (1), T. H. van Leeuwen (2)

(1) Institute of Phonetic SciencesLFOTT, University of Amsterdam, The Netherlands
(2) Faculty of Psychology and Pedagogy, Free University, Amsterdam, The Netherlands.

The present paper concerns a study of auditory perception of phonemes and phoneme boundaries in adults with developmental dyslexia. Categorical perception experiments were done to establish whether dyslexics process phoneme boundaries differently from normal readers. In a first experiment discrimination skills were tested on a stop-consonant continuum (/bɑk/-/dɑk/) and on a stop-consonant-approximant continuum (/bɑk/-/wɑk/). The stimulus material was based on natural speech of a female voice. The results of 12 dyslexic adults and 12 control subjects show that the dyslexic group is less skilled and slower in discriminating between stimulus pairs as compared to the control group. The procedure and results of the discrimination experiment are described. Next, some important methodological aspects for follow-up experiments are addressed. Better understanding of the role of these aspects is necessary for planned brain activity measurements (MMN ERP) during auditory perception of the speech stimuli and for a replication of the discrimination experiment.

Full Paper

Bibliographic reference.  Schwippert, C. E. / Koopmans-van Beinum, Florien J. / Leeuwen, T. H. van (1999): "Phoneme boundary perception in relationship to developmental dyslexia", In ICPhS-14, 877-880.