A Phase 1 interventional study of Speech Intervention in Speech Sound Disorder, sponsored by Philip Combiths. Recruiting at 1 site in United States. Open to participants aged 3 Years to 8 Years. Per ClinicalTrials.gov, last updated 2026-11-03.
Sponsored by Philip Combiths · Phase 1, Interventional, and Treatment
The goal of this clinical trial is to learn which speech treatment targets result in the greatest amount of speech learning in Spanish-English bilingual children with speech sound disorders. The main questions it aims to answer are:
Researchers will compare intervention effects across treatment provided in English and Spanish to see if the effect differs according to the language of intervention.
Participants will:
This study is a single-subject experimental design with staggered multiple baselines examining speech intervention for Spanish-English bilingual children with speech sound disorders. The study includes two arms based on the language of intervention (Spanish or English). Within each arm are two conditions that manipulate the linguistic complexity of the speech treatment target (simple consonant singleton or complex consonant cluster). Participants will be pseudo-randomly assigned to these arms and conditions.
The primary outcome is system-wide generalization; specifically, a) within-language and b) across-language generalization to untreated sounds. Accuracy data for the dependent variable will be derived from narrow phonetic transcription of participants' productions from speech probes in English and Spanish. The entire generalization probe is administered at each assessment visit (Pre, Post, and 1- and 2-Month Follow-Ups), and shorter subset probes targeting only monitored sounds are administered during Baselines and weekly during Treatment.
46 studies on the registry are indexed under Speech Sound Disorder; 16 are open to participants now.
This study's planned enrollment of 16 is below the median of 40 across 39 interventional studies indexed under Speech Sound Disorder.
Browse Speech Sound Disorder studies →This is the only study on the registry with Philip Combiths as lead sponsor.
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Exclusion Criteria:
Treatment will be conducted entirely in Spanish, targeting Spanish speech sounds. Treatment will follow a drill-play format.
Behavioral: Speech Intervention
Treatment will be conducted entirely in English, targeting English speech sounds. Treatment will follow a drill-play format.
Behavioral: Speech Intervention
The treatment will begin with imitation, whereby the child will produce target words following the study clinician's verbal model with 1:1 clinician feedback for the accuracy of the child's productions. This will include explicit articulatory instruction (i.e., verbal and visual cues) to elicit correct target forms. When a child achieves 75% accuracy following a verbal model across 2 consecutive sessions or completes the 9th session (whichever is first), treatment will shift to spontaneous production, in which the child will produce target words spontaneously or through elicitation without a verbal model. Treatment materials will be images of treatment target words, interactive games and stories, and a standard set of toys.
Comprehensive Probe or Monitored Sounds Probe
Accuracy data for the dependent variable will be derived from narrow phonetic transcription of participants' productions from speech generalization probes in English and Spanish. Both protocols elicit \~300 word productions and sample each singleton consonant and consonant cluster in the respective language a minimum of three times in every permissible word position. The entire generalization probe is administered at each assessment visit (Pre, Post, and 1- and 2-Month Follow-Ups), and shorter subset probes targeting only monitored sounds are administered during Baselines and weekly during Treatment. All transcriptions will be completed by research assistants unaware of the condition (simple or complex treatment target), arm of the study (English or Spanish language of intervention) or phase of the intervention study (Pre, Post, or Follow-up).
Time frame: At initial visit, 2-4 times across the 2 weeks prior to intervention, once per week during the 6-week intervention, within 1 week after intervention, 1 month after intervention, and 2 months after intervention
Plan to share: No
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Started May 2024 (actual). Primary completion is estimated for Mar 2027, 34 months after the start.
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From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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