Deficits in category learning in older adults: rule-based versus clustering accounts

Badham, S.P. ORCID: 0000-0002-6890-102X, Sanborn, A.N. and Maylor, E.A., 2017. Deficits in category learning in older adults: rule-based versus clustering accounts. Psychology and Aging, 32 (5), pp. 473-488. ISSN 0882-7974 (Forthcoming)

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Abstract

Memory research has long been one of the key areas of investigation for cognitive aging researchers but only in the last decade or so has categorization been used to understand age differences in cognition. Categorization tasks focus more heavily on the grouping and organization of items in memory, and often on the process of learning relationships through trial and error. Categorization studies allow researchers to more accurately characterize age differences in cognition: whether older adults show declines in the way in which they represent categories with simple rules or declines in representing categories by similarity to past examples. In the current study, young and older adults participated in a set of classic category learning problems, which allowed us to distinguish between three hypotheses: (i) rule-complexity: categories were represented exclusively with rules and older adults had differential difficulty when more complex rules were required, (ii) rule-specific: categories could be represented either by rules or by similarity, and there were age deficits in using rules, and (iii) clustering: similarity was mainly used and older adults constructed a less-detailed representation by lumping more items into fewer clusters. The ordinal levels of performance across different conditions argued against rule-complexity, as older adults showed greater deficits on less complex categories. The data also provided evidence against rule-specificity, as single-dimensional rules could not explain age declines. Instead, computational modelling of the data indicated that older adults utilized fewer conceptual clusters of items in memory than did young adults.

Item Type: Journal article
Publication Title: Psychology and Aging
Creators: Badham, S.P., Sanborn, A.N. and Maylor, E.A.
Publisher: American Psychological Association
Date: August 2017
Volume: 32
Number: 5
ISSN: 0882-7974
Identifiers:
NumberType
10.1037/pag0000183DOI
Divisions: Schools > School of Social Sciences
Depositing User: Jonathan Gallacher
Date Added: 18 May 2017 07:39
Last Modified: 10 Oct 2017 13:21
URI: http://irep.ntu.ac.uk/id/eprint/30691

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