ERIC Number: ED454668
Record Type: RIE
Publication Date: 2001-Apr
Categorization in Adults with Severe to Profound Mental Retardation.
Lewis, Pamela F.
This brief paper presents a summary of a study which examined the developmental progression of categorization and its relationship to language development in 12 adults with severe to profound mental retardation and with less than 100 words of expressive language (including manual signs). Subjects were asked to sort physically eight miniature objects consisting of four objects from each of two categories. Perceptual similarity and inclusiveness were manipulated as five contrasts had perceptually identically category members and five had perceptually non-identical category members. Receptive and expressive understanding of object labels was also assessed. The study found that only perceptual similarity influenced categorization. Nine subjects were able to sort categories with identical members, an ability associated with the onset of naming in typically developing infants and toddlers. Level of inclusiveness did not influence categorization and there was no relationship between the number of categories sorted and any of the language measures. (Contains 15 references and 4 tables.) (DB)
Publication Type: Reports - Research; Speeches/Meeting Papers
Education Level: N/A
Authoring Institution: N/A
Note: Paper presented at the Biennial Meeting of the Society for Research in Child Development (Minneapolis, MN, April 19-22, 2001).