Control over Therapist Interactions as a Reinforcer for a Child with Autism Page: 13
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condition resulted in an immediate increase in the number of initiations. At the beginning
of the 2 s removal phase initiations were at 0, but subsequently increased sharply to 8
after only 3 sessions. Implementation of the 2 s removal in the instructed condition
resulted in the number of initiations increasing from 1 to 3, more than doubling the
number over baseline measures.
During the uninstructed condition, implementing the 3 s removal phase resulted in
an immediate decrease in the number of initiations to a low level of 2. However,
subsequent exposures resulted in the number of initiations sharply increasing to 9 and
maintaining an increasing trend for the duration of the experimental conditions.
Implementing the 3 s removal phase in the instructed condition initially resulted in a
slight increase in initiations to 4. The subsequent levels of initiations remained at an
average of 2.5 for the duration of the experiment.
Figure 3 shows the total interaction duration in seconds for both the uninstructed
and instructed conditions for all 3 phases of the experiment. During the baseline of the
uninstructed condition (top graph) the total interaction duration remained stable at a mean
of 60 s (range: 45-100 sec). During the baseline of the instructed condition (bottom
graph) the total interaction duration was lower than in the uninstructed condition at 10 s
(range: 2-50 sec). During the 2 s removal phase the interaction duration immediately
increased to levels between 400-500 s in the uninstructed condition. In addition, during
the 2 s removal phase the interaction duration increased to levels between 50-80 s in the
instructed condition. During the 3-s removal phase total interaction duration again
increased to levels between 570-600 s and remained constant at 600 s for the remainder of
the manipulations in the uninstructed condition. However, during the instructed
condition the interaction duration increased to levels between 80-250 s.
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Edwards, William Harrison. Control over Therapist Interactions as a Reinforcer for a Child with Autism, thesis, August 1999; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc278765/m1/20/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .