Appendix.
Description of reference variables and sources of tasks
| Variable | Description | Source |
|---|---|---|
| WAIS Vocabulary | Provide definitions of words | Wechsler (1997a) |
| Picture Vocabulary | Name the pictured object | Woodcock & Johnson (1990) |
| Antonym Vocabulary | Select the best antonym of the target word | Salthouse (1993b) |
| Synonym Vocabulary | Select the best synonym of the target word | Salthouse (1993b) |
| 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, et al., (1976) |
| Logical Memory | Number of idea units recalled across three stories |
Wechsler (1997b) |
| Free 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, et al. (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 & Babcock (1991) |
| Pattern Comparison | Same/different comparison of pairs of line patterns |
Salthouse & Babcock (1991) |