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  • Title: Retention of symbolic communications skills by severely mentally retarded persons.
    Author: Romski MA, Sevcik RA, Rumbaugh DM.
    Journal: Am J Ment Defic; 1985 Jan; 89(4):441-4. PubMed ID: 2579558.
    Abstract:
    The nonspeech symbol vocabularies of five severely mentally retarded persons were assessed 18 months after the completion of a longitudinal computer-keyboard symbol acquisition study. These individuals retained a mean of 83% of their comprehension vocabularies and 70% of their production vocabularies without systematic maintenance teaching on the learned symbols. Interviews with special-education and living unit staff members corroborated this result and described the ways in which the subjects used their conversation boards in their everyday environment.
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