Understanding design fluency: motor and executive contributions.
Design Fluency (DF) is typically assumed to assess planning, cognitive flexibility, and fluency in generation of visual patterns, above and beyond contributions from motor speed (Delis, Kaplan, & Kramer, 2001; Ruff, 1998). The present study examined these assumptions, as little construct validation research has been done in the past. Sixty one community-dwelling elderly participants were administered the DF, Trail Making, and Letter Fluency tests from the Delis-Kaplan Executive Function System (D-KEFS), as well as electronically administered measures of motor planning and motor sequence fluency. Hierarchical regressions were used to parse out unique variance contributions to DF performance. The results showed that generation of novel designs (i.e., the first two trials on the D-KEFS DF) relied primarily on motor planning, the ability to generate novel motor actions, and, to a lesser extent, speed of drawing with a writing implement. In contrast, generation of unique designs while switching (i.e., the third trial on the D-KEFS DF) relied primarily on visual scanning and perhaps visual-attentional resources. These findings highlight the wisdom of interpreting the switching trial of the D-KEFS DF separately. Interestingly, cognitive flexibility did not contribute to performance on any of the three D-KEFS DF trials.
Suchy
Yana
Y
Department of Psychology, University of Utah, Salt Lake City, UT 84112-0251, USA. yana.suchy@psych.utah.edu
Kraybill
Matthew L
ML
Gidley Larson
Jennifer C
JC
D000368:Aged; D000369:Aged, 80 and over; D056344:Executive Function / Q000502:physiology*; D005260:Female; D015577:Geriatric Assessment; D006801:Humans; D007807:Language Tests; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D009483:Neuropsychological Tests; D010775:Photic Stimulation / Q000379:methods; D011237:Predictive Value of Tests; D025341:Principal Component Analysis; D011597:Psychomotor Performance / Q000502:physiology*; D012044:Regression Analysis; D012111:Residence Characteristics; D013223:Statistics as Topic; D014705:Verbal Behavior / Q000502:physiology*