Table 2.
Estimates of Performance by Age and Task (taken from Charness & Jastrzembski, 2001)
| Model component | Value | Source |
|---|---|---|
| A. Perceptual system | ||
| Eye fixation duration | Young = 207 ms; Old = 254 ms | Scialfa & Joffe (1997) |
| Visuospatial processing speed | RT Old = 2.27* RT Young | Zheng, et al. (2000) |
| Perceptual processor cycle time | Young = 100 ms; Old = 190 ms | Card, Moran, & Newell (1983); Meyer, et al. (2001) |
| B. Motor system | ||
| Motor processor cycle time | Young = 70 ms; Old = 139 ms | Card, Moran, & Newell (1983); Liao, Jagacinski & Greenberg (1997) |
| Acquisition time | Young = 862 ms; Old = 1060 ms | |
| Movement time | Young = 641 ms; Old = 747 ms | |
| C. Cognitive system | ||
| Verbal working memory span | Y = 7.4–.016* age (.11) | Jenkins, et al. (1999) |
| Cognitive processor cycle time | Young = 70 ms; Old = 139 ms | Card, Moran, & Newell (1983); Meyer, et al. (2001) |
| False alarm rate for recognition | Young = .05 (.07); Old = .09 (.11) | Titov & Knight (1997) |
| Choice RT-2 | Young = 353 (46); Old = 692 (196) | |
| Choice RT-4 | Young = 375 (47); Old = 733 (196) | Hertzog, Cooper & Fisk (1996) |
| Choice RT-8 | Young = 430 (76); Old = 884 (209) | |
| Digits forward | Old = 7.2 (.86) | Rochan, Waters, Caplan (2000) |
| Digits backward | Old = 5.5 (1.2) | |
| D. General slowing effect | ||
| Decay constant | OldRT = −.34 + 1.88 YoungRT (.38) | Verhaeghen & DeMeersman (1998); Sliwinski & Hall (1998) |
| Power law of practice constant | Young = .61 (.46); Old = .42 (.12) | Jenkins & Hoyer (2000) |
Note. Values enclosed in parentheses indicate standard errors.