USE OF SPECTROGRAPHIC ANALYSES TO EVALUATE THE EFFICACY OF PHONOLOGICAL INTERVENTION

A case study is presented which describes the use of spectrographic me asures to analyse the effectiveness of phonological intervention. Perc eptual analysis showed that the child realized the phonemes /l/ and /j / as the phone [1]. However, acoustic analysis showed slight differenc es between his productions of /l/ and /j/. The child's development of differential phones involved systematic acoustic changes. Principles o f coarticulation formed the basis of intervention which resulted in ad ult productions of /l/ and /j/. This study indicates the potential val ue of acoustic analyses for evaluating the efficacy of phonological in tervention.