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He learned that walking in the hallway meant not talking out loud and that his classmates would not respond to (and reinforce) this behavior, since talking out loud was not an acceptable behavior of walking down the hallway.
For example, Steven, who is displaying disruptive talk-outs approximately once every five minutes; is not likely to refrain from talking out immediately following the implementation of a plan.
Contingent tokens were earned for the absence of: (a) being out of his seat, (b) talking out, or (c) displaying poor posture.