Journal
ASSESSMENT
Volume 10, Issue 1, Pages 56-65Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/0095399702250335
Keywords
Wechsler; Digit Symbol; incidental learning; processing speed; eye movements
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The authors evaluated the relative contributions of speed, memory, and visual scanning to Digit Symbol score in a sample of young adults (N = 87). Speed (Symbol Copy) explained 35% of Digit Symbol variance; only half of this was attributable to graphomotor speed (Name Printing), implying a role for perceptual speed. Visual-scanning tests (e.g., Symbol Scan) explained (on average) 34% of Digit Symbol variance, much of which was independent of perceptual-motor speed, establishing an important role,for visual-scanning-efficiency in Digit Symbol performance. By contrast, memory tests (on average) explained only 4% to 5% of Digit Symbol variance: statistically significant but clearly, subsidiary, although a visual memory composite correlated more strongly with Digit Symbol. The Digit Symbol incidental learning procedures did, however correlate moderately, with other memory measures, suggesting that they are valid memory screening devices.
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