Performance on selected neuropsychological tests in the Alzheimer’s disease and posterior cortical atrophy groups
| tAD | PCA | Controls (n = 31; age 68.5 (7.2) years) | |
|---|---|---|---|
| Values are mean (SD). | |||
| Control scores were obtained from the control panel of the Cognition and Brain Sciences Unit, Cambridge. | |||
| *p<0.05, †p<0.005 v tAD. | |||
| FAS, ; NT, not tested; PCA, posterior cortical atrophy; tAD, typical Alzheimer’s disease. | |||
| Attention | |||
| • Forward digit span | 6.7 (1.0) | 5.7 (1.0) | 7.1 (0.9) |
| • Backward digit span | 4.3 (1.7) | 3.0 (0.9) | 5.4 (1.4) |
| Memory | |||
| • Logical memory | 0.1 (0.3) | 1.9 (2.3) | 7.8 (3.8) |
| Language and semantics | |||
| • Category fluency (animals, birds, fruit, dog breeds) | 37.3 (12.7) | 41.7 (24.2) | 60.3 (12.6) |
| • Pyramids and palm-trees (word version, /52) | 50.1 (1.9) | 48.3 (4.3) | 51.1 (1.1) |
| • 64 item picture naming ( /64) | 59.8 (4.1) | 56.0 (4.3) | 63.8 (0.4) |
| Visuospatial | |||
| • Rey figure copy ( /36) | 31.7 (3.8) | 1.2 (2.0)† | 34.2 (1.6) |
| Visual object and space perception battery (VOSP) | |||
| • Dot counting ( /10) | 9.6 (0.5) | 4.3 (2.4)† | 9.9 (0.3) |
| • Position discrimination ( /20) | NT | 11.3 (3.9) | 19.8 (0.6) |
| • Cube analysis ( /10) | 8.1 (1.6) | 2.0 (3.1)* | 9.3 (1.5) |
| • Incomplete letters ( /20) | 18.6 (1.1) | 9.8 (6.9)* | 19.2 (0.8) |
| • Object decision ( /20) | 17.3 (2.3) | 12.7 (5.1) | 16.9 (0.8) |
| Executive | |||
| • Letter fluency (FAS) | 38.4 (14.9) | 32.8 (20.5) | 41.1 (11.6) |