Table 1:
Group performance on all test scales in Experiments 1 and 2. Continuous variables are presented as means (standard deviations) and categorical variables are represented as percentages.
| EXPERIMENT 1 | EXPERIMENT 2 | |||
|---|---|---|---|---|
| VARIABLE | Younger* | Older | Amyloid Negative | Amyloid Positive |
| NEED FOR COGNITION | 60.5 (16.2) | 66.2 (14.5) | 63.1 (11.9) | 62.0 (12.7) |
| NASA EFFORT WORKING MEMORY | ||||
| 1-BACK | 10.7 (5.4) | 10.7 (5.5) | 9.4 (4.8) | 9.0 (4.7) |
| 2-BACK | 13.7 (4.5) | 13.5 (5.1) | 12.8 (4.0) | 13.0 (4.6) |
| 3-BACK | 16.0 (3.9) | 15.4 (4.6) | 14.7 (3.2) | 14.3 (5.5) |
| 4-BACK | 17.2 (3.6) | 16.3 (4.7) | 16.0 (3.1) | 14.5 (5.9) |
| NASA EFFORT SPEECH | ||||
| 0 SNR | 12.9 (5.0) | 12.8 (4.9) | NA | NA |
| −4 SNR | 15.2 (4.4) | 15.5 (4.3) | NA | NA |
| −8 SNR | 17.5 (3.6) | 17.5 (3.8) | NA | NA |
| −12 SNR | 18.5 (3.4) | 18.5 (4.2) | NA | NA |
| LISTENING SPAN | 43.2 (12.1) | 41.9 (11.9) | NA | NA |
| SYMMETRY SPAN | 20.5 (10.3) | 10.6 (7.6) | NA | NA |
| OPERATION SPAN | 48.8 (18.3) | 43.0 (19.6) | NA | NA |
Note: Data from the younger adult sample in Experiment 1 were taken from Crawford et al. (2022).