NCT07526246

Motor-based Intervention for Childhood Apraxia of Speech: DTTC-Connect

A Randomized Control Trial of Motor-based Intervention for Childhood Apraxia of Speech: Dynamic Temporal and Tactile Cueing-Connect (DTTC-Connect)

• Status: Not Yet Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 68 (estimated)
• Sponsor: New York University · Academic / Other
• Sex: All
• Age: 3 Years – 12 Years
• Healthy volunteers: Not accepted

Summary

Childhood apraxia of speech (CAS) is a complex motor speech disorder that significantly limits a child's ability to communicate in daily activities, with difficulties often persisting into adolescence and adulthood. There is solid evidence that motor-based interventions, such as Dynamic Temporal and Tactile Cueing (DTTC), improve word production in children with CAS. Building on this strong foundation, the next critical step is to extend this work to support functional communication in connected speech, where children with CAS often continue to struggle. There is a critical need for a systematic bridge within the context of treatment from word-level practice to connected speech, as robust word-level gains often fail to generalize to other speaking contexts. This work addresses this gap by transitioning children from word- to phrase-level practice using Dynamic Temporal and Tactile Cueing-Connect (DTTC-Connect), a novel, structured adaptation of DTTC that targets connected speech production. Our approach builds on established DTTC principles while incorporating progression to more complex utterances, offering a developmentally appropriate, research-informed pathway to functional communication. This study is a Phase II randomized controlled trial (RCT) designed to examine the efficacy of DTTC-Connect, a motor-based treatment that includes phrase-level practice to refine connected speech and support communicative participation for children with CAS. The overall objectives of this work are to test the efficacy of DTTC-Connect and document changes in speech motor control at the connected speech level in 68 children with CAS (3;6 - 12;11 years of age) who receive treatment twice a week for 8 weeks (16 sessions). The central hypothesis is that DTTC-Connect will lead to lasting improvements in phrase accuracy, speech intelligibility and speech motor control, ultimately enhancing a child's communicative participation.

Detailed description

The long-term goal of this research is to provide evidence-based treatment guidelines to enhance speech intelligibility and therefore, communicative participation, for children with childhood apraxia of speech (CAS). The overall objectives are to test the efficacy of Dynamic Temporal and Tactile Cueing-Connect (DTTC-Connect) and document changes in speech motor control at the connected speech level, when intervention is provided two times per week for eight weeks. The central hypothesis is that DTTC-Connect will lead to lasting improvements in phrase accuracy, speech intelligibility, and speech motor control, ultimately enhancing a child's communicative participation, as supported by our previous Dynamic Temporal and Tactile Cueing (DTTC) research and pilot data on DTTC-Connect. The following aims are examined: Aim 1: Quantify the effects of DTTC-Connect on connected speech accuracy and whether previous DTTC modifies response to DTTC-Connect. 68 children with CAS will receive 8 weeks of DTTC-Connect, with a subset of children returning from the prior DTTC randomized controlled trial (RCT). The working hypothesis is that untreated phrase accuracy (primary outcome) and speech intelligibility (secondary outcome) will increase pre-post DTTC-Connect with gains maintained at 8 weeks post-treatment in all children. It is hypothesized that prior DTTC RCT performance (returning participants) will predict untreated phrase accuracy pre-post DTTC-Connect. Linear mixed-effects models will be used to estimate the DTTC-Connect treatment effect and the moderation effect of prior DTTC exposure. Aim 2: Quantify the effects of DTTC-Connect on speech motor variability and whether previous DTTC modifies response to DTTC-Connect. Acoustic and kinematic (lip/jaw movement) data will be obtained pre- and post- DTTC-Connect from 68 children with CAS, including a subset of children returning from the prior DTTC RCT. The working hypothesis is that variability (secondary outcome) will be reduced in all children following DTTC-Connect, with changes maintained at 8 weeks post-treatment. Inclusion of returning children will allow the examination of extended treatment on speech motor control. It is hypothesized that the change in variability in the prior DTTC RCT will moderate the treatment effect with DTTC-Connect. Linear mixed-effects models will be used to estimate changes in variability over time as in Aim 1. Aim 3: Evaluate the effect of DTTC-Connect on communicative participation in children with CAS. Communicative participation (secondary outcome) will be assessed in all children pre- and post- DTTC-Connect. The working hypothesis is that children with CAS who receive DTTC-Connect will show meaningful gains in their attitudes about speaking and in caregiver-reported functional communication. Linear mixed-effects models will be used to estimate changes in communicative participation following DTTC-Connect. Upon completion of these aims, the expected outcome is to establish the efficacy of DTTC-Connect in a large cohort of children with CAS, while uncovering how previous response to word-level DTTC informs individualized treatment planning. In doing so, it will generate actionable insights to enhance clinical outcomes while also deepening theoretical understanding of speech motor learning in CAS.

Conditions

• Childhood Apraxia of Speech

Interventions

Type	Name	Description
BEHAVIORAL	Dynamic Temporal and Tactile Cueing - Connect (DTTC-Connect)	DTTC-Connect is a motor-based intervention designed to improve speech accuracy in children with CAS by targeting movement transitions within phrases. Treatment begins with selecting a target phrase identified through dynamic assessment as being within the child's optimal challenge point. Using this initial target, four additional phrases are constructed that systematically build in structural, phonetic, and grammatical complexity to support gradual progression in motor skill. Treatment begins with two-word phrases and follows the first three levels of the DTTC temporal hierarchy: Simultaneous Production → Direct Imitation → Delayed Imitation. The final step is Elicited Production where children produce the target at random intervals in the absence of a prior model. Aligned with standard DTTC, children initially receive maximal support during Simultaneous Production. As accuracy improves, support is faded and the child progresses to less supported levels of production.

Timeline

• Start date: 2026-09-15
• Primary completion: 2030-09-01
• Completion: 2031-03-31
• First posted: 2026-04-13
• Last updated: 2026-04-16