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Related Experiment Video

Updated: Sep 8, 2025

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
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A temporal-based therapy for children with inconsistent phonological disorder: A case-series.

Fateme Sayyahi1, Véronique Boulenger2

  • 1School of Rehabilitation, Kermanshah University of Medical Sciences, Kermanshah, Iran.

Clinical Linguistics & Phonetics
|June 13, 2022
PubMed
Summary

This study introduces T-CVT, a novel temporal-based therapy for children with inconsistent phonological disorder (IPD). The therapy significantly improved speech consistency and accuracy by lengthening phoneme transitions, aiding temporal processing and phonological planning.

Keywords:
Core Vocabulary TherapyInconsistent phonological disordergap detection thresholdphonological planningtemporal auditory processing

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Area of Science:

  • Speech-Language Pathology
  • Developmental Psychology
  • Auditory Neuroscience

Background:

  • Children with inconsistent phonological disorder (IPD) often exhibit deficits in temporal auditory processing, specifically higher gap detection thresholds.
  • These deficits may impact phonological planning and production, leading to inconsistent and inaccurate speech.

Purpose of the Study:

  • To investigate the efficacy of a novel temporal-based therapy, T-CVT, for improving speech production in children with IPD.
  • To determine if T-CVT enhances phonological planning abilities by providing extra time for phoneme identification.

Main Methods:

  • A new temporal-based therapy (T-CVT) was developed, digitally lengthening formant transitions in therapy words.
  • Four preschool children with IPD received T-CVT for eight weeks.
  • Speech consistency (% inconsistency) and accuracy (percentage of consonants correct - PCC) were measured before, after, and at follow-up.

Main Results:

  • T-CVT significantly improved word production: % inconsistency decreased from 59% to 2%, and PCC increased from 61% to 92%.
  • Improvements were maintained at three-month follow-up (2% inconsistency, 99% PCC).
  • Generalization to non-treated material was observed, with % inconsistency decreasing from 67% to 10% and PCC increasing from 63% to 90% in nonword repetition tasks.

Conclusions:

  • The T-CVT intervention shows significant efficacy in improving speech consistency and accuracy in children with IPD.
  • The findings support the hypothesis that targeting temporal auditory processing deficits can enhance phonological planning and production in children with IPD.
  • T-CVT offers a promising therapeutic approach for children experiencing speech sound disorders associated with temporal processing difficulties.