Abstract
We examined the acquisition of incidental information and observational learning of incidental information by adolescents with moderate intellectual disabilities during school-directed systematic instruction. Effectiveness of constant time-delay instruction for vocational-skill acquisition was evaluated within a multiple-probe design across six dyads. Dyadic instructional arrangements allowed the assessment of incidental information acquired through observation. The constant time-delay procedure was effective in teaching the target vocational skill. In addition, participants acquired and retained approximately 50% of the incidental information to which they were exposed during the consequent events of constant time-delay instruction either through direct verbal presentation or through observation of their peers’ instruction.
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