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Children (Basel). 2021 Dec 01;8(12). doi: 10.3390/children8121107.

Stimulus Control Procedure for Reducing Vocal Stereotypies in an Autistic Child.

Children (Basel, Switzerland)

Marco Esposito, Laura Pignotti, Federica Mondani, Martina D'Errico, Orlando Ricciardi, Paolo Mirizzi, Monica Mazza, Marco Valenti

Affiliations

  1. Department of Applied Clinical Sciences and Biotechnology, University of L'Aquila, 67100 L'Aquila, Italy.
  2. Department of Psychology, University of Rome La Sapienza, 00185 Roma, Italy.
  3. Autism Research and Treatment Centre, Una Breccia nel Muro, 00168 Roma, Italy.
  4. Modern Cultures and Literatures, University of Rome La Sapienza, 00185 Roma, Italy.
  5. Department of Psychology, University of Bari, 70121 Bari, Italy.
  6. Regional Centre for Autism, Abruzzo Region Health System, 67100 L'Aquila, Italy.

PMID: 34943302 DOI: 10.3390/children8121107

Abstract

Stereotyped vocal behavior exhibited by a seven-year-old child diagnosed with autism spectrum disorder and maintained by automatic reinforcement was placed under stimulus control through discrimination training. The training consisted of matching a green card (SD) with free access to vocal stereotypy and a red card (SD-absent) with interruption of stereotypy and vocal redirection. At the same time, appropriate behaviors were reinforced. After discrimination training, the child rarely engaged in vocal stereotypy in the red card condition and, to a greater extent, in the green card condition, demonstrating the ability to discriminate between the two different situations. After the training, the intervention began. Once they reached the latency criterion in the red stimulus condition, the child could have free access to vocal stereotypy (green card condition). The latency criterion for engaging in stereotypy was gradually increased during the red card condition and progressively decreased during the green card condition. The intervention follows a changing criterion design. This study indicates that stimulus discrimination training is a useful intervention to reduce vocal stereotypy in an autistic child.

Keywords: autism spectrum disorder; automatic reinforcement; changing criterion design; stimulus control; vocal stereotypies

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