This study investigated the effectiveness of expressive language therapy utilizing acoustic amplification on six preverbal prekindergarten chil dren with hearing-related specific language impairments. A multiple
baseline single-subject design was used to compare the differences
between measures of attention span and mean length of utterance
(MLU) during individual language therapy under conditions of am
plification and no amplification. No difference was identified for length
of attention span. But increased MLUs were found under amplified
therapy conditions for all the children.
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