Table 1.
Comparison of visual search performance in patients with Parkinson's disease and age-matched controls
| Target | Patients | Healthy volunteers | |||
|---|---|---|---|---|---|
| A | Response time (s) | + | 19.2 (1.4) | 18.8 (2.4) | |
| T | 23.5 (1.3) | 23.8 (2.5) | |||
| B | Targets missed | + | 2.4 (0.5) | 1.9 (0.3) | |
| T | 1.9 (0.5) | 1.9 (0.5) | |||
| C | Re-fixation rate on targets | + | 51.2 (6.5) | 24.2 (3.4) | |
| T | 65.3 (6.3) | 34.0 (5.3) | |||
| D | Re-click rate on targets | + | 5.9 (1.3) | 6.3 (0.7) | |
| T | 8.6 (1.8) | 8.4 (0.9) | |||
| E | Median interval between fixation and re-fixation | + | 2.8 (0.6) | 2.1 (0.5) | |
| T | 2.2 (1.0) | 4.4 (1.0) | |||
| F | Distractors not fixated | + | 19.4 (0.8) | 31.6 (1.5) | |
| T | 17.1 (0.8) | 21.7 (1.4) | |||
| G | Re-fixation rate on distractors | + | 12.1 (1.2) | 2.1 (0.4) | |
| T | 22.1 (1.7) | 9.6 (1.6) | |||
| H | Dwell time on targets (ms) | + | 319.5 (23) | 395.3 (30) | |
| T | 323.2 (22) | 356.9 (30) | |||
| H | Dwell time on distractors (ms) | + | 228.2 (17.7) | 200.0 (32) | |
| T | 232.0 (15.0) | 225.0 (19) |
Values represent means and standard deviations are given in parenthesis. Values for efficient search denoted by “+” symbol and for inefficient search by “T” symbol.