Effects of integral stimulation therapy on speech - Portland State ...

Data Results for Labiodentals Fricatives: /f/ & /v/
Figure 2 illustrates CP’s performance as the percent <strong>of</strong> labiodental fricatives /f/ and
/v/ correctly produced during speech probes. Data were charted over time during
baseline, treatment, and post treatment phases. Pre treatment data probes indicated that
CP produced bilabial fricatives /Ȉ/ and /β/ in place <strong>of</strong> /f/ and /v/ phonemes in the
majority <strong>of</strong> his substitution errors. His errors, however, were not entirely consistent, as he
occasionally made substitutions with /b/, /s/, and /m/ phonemes or omitted labiodental
fricatives from words entirely. CP demonstrated consistent levels <strong>of</strong> performance on
speech probes during baseline sessions (1 through 11) alternating between 0 and 40%
correct production <strong>of</strong> /f/ and /v/ phonemes. Sessions 12 through 37 include data probes
gathered after treatment had begun. A significant increase in accurate production <strong>of</strong> /f/
and /v/ phonemes was observed following session 15. This upward trend fluctuated
between 40% and 100% accuracy for the duration <strong>of</strong> the treatment sessions. Variance in
accuracy continued to stabilize as the treatment progressed, as the upward trend in
accuracy shown in Figure 2 illustrates.
Post-Treatment Results for Labiodentals Fricatives: /f/ & /v/. Post treatment data
(sessions 38 through 40 in Figure 2) illustrate that CP’s correct production <strong>of</strong> target
phonemes /f/ and /v/ remained at or above 80% accuracy in carrier phrases. Data results
indicate that CP’s accurate production <strong>of</strong> /f/ and /v/ phonemes increased over the course
<strong>of</strong> 26 treatment sessions and were maintained approximately 2 weeks after treatment
ended, suggesting motor learning had occurred.
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