The Analysis of Verbal Behavior

, Volume 29, Issue 1, pp 71–83 | Cite as

Using a Lag Reinforcement Schedule to Increase Phonemic Variability in Children With Autism Spectrum Disorders

  • Kate Koehler-Platten
  • Laura L. GrowEmail author
  • Kimberly A. Schulze
  • Tara Bertone
Research Article


Shaping functional vocal language is difficult when an individual has not yet acquired an echoic repertoire and does not emit sufficient phonemes (i.e., speech sounds) for shaping. Few studies have evaluated interventions to increase the frequency and breadth of phonemes. The current study extended Esch, Esch, and Love (2009) by evaluating the effects of a Lag 1 reinforcement schedule on vocal variability and limiting the definition of variability to responses that incorporated a novel phoneme. For 2 of the 3 participants, the cumulative number of novel phonemes, the percentage of trials with variability, and the number of different phonemes emitted per session increased during the Lag 1 intervention phase.

Key words

echoics lag schedules speech vocal variability 


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Copyright information

© Association of Behavior Analysis International 2013

Authors and Affiliations

  • Kate Koehler-Platten
    • 1
  • Laura L. Grow
    • 2
    Email author
  • Kimberly A. Schulze
    • 1
  • Tara Bertone
    • 3
  1. 1.Saint Cloud State UniversityUSA
  2. 2.Educational and Counselling Psychology and Special EducationUniversity of British ColumbiaVancouverCanada
  3. 3.Autism Matters, Inc.USA

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