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Target-related distractors disrupt object selection in everyday action: Evidence from participants with dementia

Published online by Cambridge University Press:  19 March 2010

TANIA GIOVANNETTI ,
BRIANNE MAGOUIRK BETTCHER ,
LAURA BRENNAN ,
DAVID J. LIBON ,
DENENE WAMBACH  and
COLETTE SETER
TANIA GIOVANNETTI*
Affiliation:
Department of Psychology, Temple University, Philadelphia, Pennsylvania
BRIANNE MAGOUIRK BETTCHER
Affiliation:
Department of Psychology, Temple University, Philadelphia, Pennsylvania
LAURA BRENNAN
Affiliation:
Department of Psychology, Temple University, Philadelphia, Pennsylvania
DAVID J. LIBON
Affiliation:
Department of Neurology, Drexel University, Philadelphia, Pennsylvania
DENENE WAMBACH
Affiliation:
Department of Psychology, Temple University, Philadelphia, Pennsylvania
COLETTE SETER
Affiliation:
Department of Psychology, Temple University, Philadelphia, Pennsylvania
*
*Correspondence and reprint requests to: Tania Giovannetti, Ph.D., Temple University, Psychology Department, 1701 N. 13th Street, Philadelphia, Pennsylvania 19122. E-mail: [email protected]
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Abstract

This study evaluated the impact of distractor objects and their similarity to target objects on everyday task performance in dementia. Twenty participants with dementia due to Alzheimer’s disease (n = 12) or subcortical vascular disease (n = 8) were videotaped while they performed 3 discrete tasks: (1) make a cup of coffee, (2) wrap a gift, and (3) pack a lunch under two conditions that were counterbalanced across participants. The conditions differed in terms of the type of distractor objects included in the workspace: (1) Target-Related Distractor Condition - distractor objects were functionally and visually similar to target objects (e.g., salt for sugar) (2) Unrelated Distractor Condition - distractors were neither visually nor functionally similar to targets (e.g., glue for sugar). Participants touched (t = 4.19; p < .01) and used (z = 3.00; p < .01) significantly more distractors, made more distractor errors (i.e., substitutions; t = 2.93; p < .01), and took longer to complete tasks (t = 2.27; p < .05) in the Target-Related Distractor condition. The percent of steps accomplished and non-distractor errors did not differ across conditions (t < 1.26; p > .05 for both). In summary, distractors that were similar to targets elicited significant interference effects circumscribed to object selection. (JINS, 2010, 16, 484–494.)

Keywords

Activities of daily livingIdeational apraxiaRehabilitationAlzheimer’s diseaseInhibitionHuman activities
Type
Research Articles
Information
Journal of the International Neuropsychological Society , Volume 16 , Issue 3 , May 2010 , pp. 484 - 494
Copyright
Copyright © The International Neuropsychological Society 2010

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