Efficacy of IMPACT in Infant Siblings of Children With ASD

Conditions:Neurology, Psychiatric, Autism
Therapuetic Areas:Neurology, Psychiatry / Psychology
Age Range:Any
Start Date:February 16, 2016
End Date:August 30, 2019
Contact:Catherine Bush, M.A.CCC SLP

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Efficacy of Parent-implemented Treatment in Infant Siblings of Children With Autism Spectrum Disorder (ASD)

Over a 5 year period infant and baby siblings of children with autism spectrum disorders
(ASD) will be recruited to this study and will be randomized into 2 groups. Parents of the
intervention group will receive 12 weeks of coaching in how to implement this intervention.
Parents randomized to the control group will not receive intervention coaching. Both groups
will attend a series of clinic appointments for data collection that occur at 3 month
intervals over a 9 month period.

This two-site randomized controlled trail (RCT) will include a sample of 80 siblings of
children with ASD (Sibs-ASD) (11 months, 15 days to 18 months, 15 days) who are stratified on
initial cumulative-risk status for communication disorder and then randomly assigned to
Ingersoll's Improving Parents As Communication Teachers (ImPACT; Ingersoll & Dvortcsak, 2010)
treatment or to a business-as-usual (BAU) control condition. The following hypotheses will be

1. Compared to the BAU Control, children assigned to the ImPACT group will show (a) more
growth on pivotal skills and language level, and (b) a lesser degree of ASD
symptomatology and language delay.

2. Pretreatment, cumulative-risk level will statistically interact with (i.e., moderate)
treatment assignment to predict children's (a) change in pivotal skills and language,
and (b) severity of autism symptoms and language delay.

3. Compared to the BAU Control, parents in ImPACT will have more optimal parenting stress
and parenting efficacy, at least in parents with average or below average depressive
symptoms prior to treatment (i.e., depressive symptoms will moderate the effect of
ImPACT on parental stress and parenting efficacy).

4. The effect that ImPACT has on growth of pivotal skills and language will be mediated by
parents' frequency and fidelity of use of ImPACT strategies at immediate post-treatment.

5. The effect of ImPACT on degree of children's language delay and ASD symptomatology at 6
months post-treatment will be mediated by their pivotal skill level at 3 months

Inclusion Criteria:

Younger sibling of a child with ASD -

1. Age: 11 months, 15 days to 18 months, 15 days

2. Older biological sibling: Must have a diagnosis of Autism from UW or VU, which is
confirmed via record review. If the older sibling was not diagnosed at UW or VU, then
a diagnostic appointment must be made for the older sibling at the corresponding
institution in order to confirm the diagnosis of ASD. Half-siblings are ok.

3. Vision - WNL corrected

4. Hearing - WNL corrected

5. Motor: The child must be able to sit independently while picking up objects and giving
them to another person.


No primary motor impairment. No feeding tubes. No other neurological or genetic conditions.
Primary language exposure: The primary parent speak to the child using English 50% of the
time, and process.
We found this trial at
Seattle, Washington 98104
(206) 543-2100
Principal Investigator: Wendy Stone, Ph.D.
Phone: 206-685-2821
Univ of Washington Founded in 1861 by a private gift of 10 acres in what...
Seattle, WA
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2201 West End Ave
Nashville, Tennessee 37232
(615) 322-7311
Principal Investigator: Paul J. Yoder, Ph.D.
Vanderbilt University Vanderbilt offers undergraduate programs in the liberal arts and sciences, engineering, music, education...
Nashville, TN
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