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TABLE 3<br />
Major Findings<br />
Study Communicati<strong>on</strong> C<strong>on</strong>sequences O<str<strong>on</strong>g>the</str<strong>on</strong>g>r C<strong>on</strong>sequences<br />
Adkins & Axelrod<br />
(2002)<br />
Anders<strong>on</strong> (2002)<br />
The use of PECS produced<br />
a better acquisiti<strong>on</strong> rate,<br />
more sp<strong>on</strong>taneous<br />
usage, <strong>and</strong> a higher<br />
generalizati<strong>on</strong> rate than<br />
<str<strong>on</strong>g>the</str<strong>on</strong>g> use of sign language<br />
for <str<strong>on</strong>g>the</str<strong>on</strong>g> child with PDD.<br />
PECS was a more effective<br />
method for <str<strong>on</strong>g>the</str<strong>on</strong>g> child<br />
with PDD, <strong>and</strong> it<br />
generalized under<br />
different c<strong>on</strong>diti<strong>on</strong>s.<br />
PECS was <str<strong>on</strong>g>the</str<strong>on</strong>g> preferred<br />
resp<strong>on</strong>se method used<br />
by <str<strong>on</strong>g>the</str<strong>on</strong>g> child.<br />
The child began to imitate<br />
some sounds <strong>and</strong> <strong>on</strong>esyllable<br />
words<br />
For <str<strong>on</strong>g>the</str<strong>on</strong>g> majority of <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
children, rates of<br />
acquisiti<strong>on</strong> in <str<strong>on</strong>g>the</str<strong>on</strong>g> PECS<br />
c<strong>on</strong>diti<strong>on</strong> were<br />
uniformly faster than<br />
rates of acquisiti<strong>on</strong> in<br />
<str<strong>on</strong>g>the</str<strong>on</strong>g> sign language<br />
c<strong>on</strong>diti<strong>on</strong>.<br />
All of <str<strong>on</strong>g>the</str<strong>on</strong>g> children<br />
mastered more items in<br />
<str<strong>on</strong>g>the</str<strong>on</strong>g> PECS c<strong>on</strong>diti<strong>on</strong> than<br />
in <str<strong>on</strong>g>the</str<strong>on</strong>g> sign language<br />
c<strong>on</strong>diti<strong>on</strong>.<br />
All <str<strong>on</strong>g>the</str<strong>on</strong>g> children<br />
dem<strong>on</strong>strated resp<strong>on</strong>se<br />
generalizati<strong>on</strong> in <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
PECS c<strong>on</strong>diti<strong>on</strong>; four<br />
out of <str<strong>on</strong>g>the</str<strong>on</strong>g> six children<br />
dem<strong>on</strong>strated skill<br />
generalizati<strong>on</strong> in <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
sign language c<strong>on</strong>diti<strong>on</strong>.<br />
Three of <str<strong>on</strong>g>the</str<strong>on</strong>g> children<br />
appeared to behaviorally<br />
prefer PECS; <str<strong>on</strong>g>the</str<strong>on</strong>g> o<str<strong>on</strong>g>the</str<strong>on</strong>g>r<br />
three children appeared<br />
to behaviorally prefer<br />
sign language.<br />
All <str<strong>on</strong>g>the</str<strong>on</strong>g> children initiated<br />
with PECS more often<br />
than with sign language<br />
when both modalities<br />
were available.<br />
The three children who<br />
appeared to prefer sign<br />
language initiated <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
greatest number of sign<br />
trials during <str<strong>on</strong>g>the</str<strong>on</strong>g> free<br />
choices without PECS<br />
probes.<br />
The child appeared to be able<br />
to achieve corresp<strong>on</strong>dence<br />
to <str<strong>on</strong>g>the</str<strong>on</strong>g> presented object.<br />
Five of <str<strong>on</strong>g>the</str<strong>on</strong>g> six children<br />
dem<strong>on</strong>strated more eye<br />
c<strong>on</strong>tact in <str<strong>on</strong>g>the</str<strong>on</strong>g> sign language<br />
c<strong>on</strong>diti<strong>on</strong> than in <str<strong>on</strong>g>the</str<strong>on</strong>g> PECS<br />
c<strong>on</strong>diti<strong>on</strong>.<br />
Several children began<br />
vocalizing during treatment<br />
in both <str<strong>on</strong>g>the</str<strong>on</strong>g> sign language<br />
<strong>and</strong> PECS c<strong>on</strong>diti<strong>on</strong>s.<br />
However, <str<strong>on</strong>g>the</str<strong>on</strong>g> three children<br />
who vocalized during<br />
correct resp<strong>on</strong>ding did so<br />
significantly more often in<br />
<str<strong>on</strong>g>the</str<strong>on</strong>g> sign language c<strong>on</strong>diti<strong>on</strong><br />
than in <str<strong>on</strong>g>the</str<strong>on</strong>g> PECS c<strong>on</strong>diti<strong>on</strong>.<br />
Tantrum <strong>and</strong> avoidance<br />
behaviors decreased for all<br />
<str<strong>on</strong>g>the</str<strong>on</strong>g> children in both PECS<br />
<strong>and</strong> sign language<br />
c<strong>on</strong>diti<strong>on</strong>s.<br />
Three of <str<strong>on</strong>g>the</str<strong>on</strong>g> six participants<br />
dem<strong>on</strong>strated significant<br />
increases in positive affect<br />
in <str<strong>on</strong>g>the</str<strong>on</strong>g> sign language<br />
c<strong>on</strong>diti<strong>on</strong>, while <strong>on</strong>ly <strong>on</strong>e<br />
significant increase was<br />
found in <str<strong>on</strong>g>the</str<strong>on</strong>g> PECS<br />
c<strong>on</strong>diti<strong>on</strong>.<br />
Two children dem<strong>on</strong>strated<br />
more self-stimulati<strong>on</strong> in <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
sign language c<strong>on</strong>diti<strong>on</strong>,<br />
while two children engaged<br />
in significantly more selfstimulated<br />
in <str<strong>on</strong>g>the</str<strong>on</strong>g> PECS<br />
c<strong>on</strong>diti<strong>on</strong>.<br />
Report of<br />
Generalizati<strong>on</strong> a<br />
Relati<strong>on</strong> to<br />
PECS b<br />
Y M<br />
Y H<br />
Functi<strong>on</strong>al Communicati<strong>on</strong> Interventi<strong>on</strong> / 69