A Meta-Analysis of Single Case Research Studies on Aided Augmentative and Alternative Communication Systems With Individuals With Autism Spectrum Disorders
Journal of Autism and Developmental Disorders
Ganz, J. B., Earles-Vollrath, T. L., et al. (2012).
Journal of Autism and Developmental Disorders, 42(1), 60-74.
This meta-analysis investigates the effectiveness of augmentative and alternative communication (AAC) systems in individuals on the autism spectrum.
Not stated
From 1980 to June 2008
Single-case research designs
24
<div>Meta-analysis found strong effects for the use of aided AAC on communication skills in individuals on the autism spectrum as follows:</div>
<div>
<ul>
<li>Type of AAC system
<ul>
<li>Picture Exchange Communication System: IRD = 0.99;</li>
<li>Speech-generating devices: IRD = 0.99; and</li>
<li>Picture-based systems: IRD = 0.61. S</li>
</ul>
</li>
<li>Type of AAC outcome
<ul>
<li>Social skills: IRD = 0.90;</li>
<li>Challenging behaviors (e.g., aggression): IRD = 0.80, and </li>
<li>Spelling: IRD = 0.79.</li>
</ul>
</li>
</ul>
<div>The authors noted that effect sizes should be interpreted cautiously due to the small number of relevant studies. There was significant variation in Improvement Rate Difference (IRD) across studies, especially those using other picture-based AAC strategies.</div>
</div>
