TY  - BOOK
AU  - Emily N. White 
AU  - Rachel R. Cagliani 
TI  - Effect on Speech Development With Modifications to Picture Exchange Communication System 
KW  - autism spectrum disorder
KW  - Picture Exchange Communication System (PECS)
KW  - preschool
KW  - vocalizations
N2  - The current study examined vocalizations that occurred during training of the Picture Exchange Communication System for three U.S. preschool-age participants with autism spectrum disorder. In Phase IV, the protocol incorporates a delay to reinforcement in an effort to encourage vocalizations; however, the manual does not suggest additional strategies to try when vocalizations do not occur during the delay to reinforcement. Researchers evaluated a vocal model prompt following the delay to reinforcement and continued to measure vocalizations when the delay to reinforcement alone did not increase vocalizations. Two of the three participants increased independent vocalizations after the addition of the vocal model. Implications for practitioners and future research are discussed
ER  -