Comparing normal and pathological articulation by means of electropalatography  

Anita McAllister* and Robert McAllister

*Department of Speech Pathology, Danderyd Hospital, Danderyd, Sweden.

Proceedings of the XIVth International Congress of Phonetic Sciences (1999): 1357 - 1360
(San Francisco, USA)  

ABSTRACT

This paper reports on the first stages of a study aiming at evaluating a therapeutic method for treatment of articulatory disorders using palatal plates and intra oral stimulation ad modum Castillo-Morales (Castillo-Morales, 1989). Methods for evaluating therapy outcome and efficacy are needed in all clinical practice. In the field of speech pathology, outcome evaluations are usually based on the clinicians informal perceptual judgement. The systematic outcome evaluation in the subsequent stages will be based on instrumental registrations of articulatory patterns and listener judgments. In the present study a comparison is made between pathological and normal speech. Electropalatography (EPG) was used to document articulation in two subjects with oral motor dysfunctions, primarily affecting specific speech sounds. The subjects had normal intelligence and were presently enrolled in the public school system. The subject's speech was recorded acoustically and dynamic EPG records of tongue-palate contacts were gathered during the production of Swedish stops and fricatives. An analysis of these patients' speech production patterns was compared to data on normal patterns of articulation for these Swedish sounds. Differences were found between normal speech and subjects regarding constriction place and constriction width for fricative sound. The clinical evaluation regarding severity of the articulatory deviation was confirmed by a t-test between subjects, p < .001.

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