Description of Virginia Cognitive Aging Project Variables and Sources of Tasks.

Variable	Description	Source
Wechsler Vocabulary	Provide definitions of words	Wechsler (1997a)
Picture Vocabulary	Name the pictured object	Woodcock and Mather (1990)
Antonym Vocabulary	Select the best antonym of the target word	Salthouse (1993)
Synonym Vocabulary	Select the best synonym of the target word	Salthouse (1993)
Matrix Reasoning	Determine which pattern best completes the missing cell in a matrix	Raven (1962)
Shipley Abstraction	Determine the words or numbers that are the best continuation of a sequence	Zachary (1986)
Letter Sets	Identify which of five groups of letters is different from the others	Ekstrom, French, Harman, and Dermen (1976)
Spatial Relations	Determine the correspondence between a 3-D figure and alternative 2-D figures	Bennett, Seashore, and Wesman (1997)
Paper Folding	Determine the pattern of holes that would result from a sequence of folds and a punch through folded paper	Ekstrom et al. (1976)
Form Boards	Determine which combinations of shapes are needed to fill a larger shape	Ekstrom et al. (1976)
Logical Memory	Number of idea units recalled across three stories	Wechsler (1997b)
Word Recall	Number of words recalled across Trials 1 to 4 of a word list	Wechsler (1997b)
Paired Associates	Number of response terms recalled when presented with a stimulus term	Salthouse, Fristoe, and Rhee (1996)
Digit Symbol	Use a code table to write the correct symbol below each digit	Wechsler (1997a)
Letter Comparison	Same/different comparison of pairs of letter strings	Salthouse and Babcock (1991)
Pattern Comparison	Same/different comparison of pairs of … line patterns	Salthouse and Babcock (1991)