Table 2. Demographics and descriptives.
| Variable |
Low schizotypy |
Average schizotypy |
High schizotypy |
|||
|---|---|---|---|---|---|---|
| Mean | s.d. | Mean | s.d. | Mean | s.d. | |
| Demographics | ||||||
| SPQ score | 3.8 | 3.1 | 27.8 | 4 | 50.1 | 6.1 |
| Age | 25.3 | 5.0 | 23.8 | 4.6 | 25.4 | 5.8 |
| Premorbid IQ (NART) | 114.2 | 6.2 | 114.2 | 4.9 | 113.8 | 6.0 |
| Years of education | 16.3 | 2.2 | 15.5 | 1.7 | 17.4 | 2.6 |
| N-Back percentage correct | ||||||
| 1-Back | 99.6 | 0.8 | 99.5 | 0.7 | 97.8 | 0.8 |
| 2-Back | 92.2 | 2.6 | 96.2 | 2.5 | 94.7 | 2.8 |
| 3-Back | 86.7 | 2.3 | 83.3 | 2.3 | 78.1 | 2.5 |
| N-Back errors of commission | ||||||
| 1-Back | 0.1 | 0.1 | 0.1 | 0.1 | 0.3 | 0.1 |
| 2-Back | 0.1 | 0.1 | 0.0 | 0.1 | 0.2 | 0.1 |
| 3-Back | 0.1 | 0.2 | 0.7 | 0.2 | 1.4 | 0.2 |
| Spatial working memory between search errors | ||||||
| Load 1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 |
| Load 2 | 0.7 | 0.2 | 0.5 | 0.2 | 0.5 | 0.2 |
| Load 3 | 1.0 | 0.4 | 2.0 | 0.4 | 2.0 | 0.4 |
| Spatial working memory: within search errors | ||||||
| Load 1 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 |
| Load 2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.3 | 0.1 |
| Load 3 | 0.6 | 0.3 | 0.5 | 0.3 | 0.4 | 0.3 |
| Verbal fluency: mean number correct words | ||||||
| FAS task | 14.6 | 4.0 | 15.5 | 4.3 | 13.7 | 3.6 |
| Category swap task | 7.7 | 1.4 | 8.0 | 1.5 | 7.1 | 1.3 |
| Verbal fluency: mean number correct transitions | ||||||
| Category swap task | 6.8 | 0.3 | 7.7 | 0.3 | 7.4 | 0.3 |
| Anti-saccade | ||||||
| Errors | 28.2 | 17.1 | 36.2 | 24.2 | 49.5 | 26.3 |
| Amplitude gain | 119.4 | 23.5 | 122.2 | 28.0 | 116.1 | 37.1 |
| Peak velocity | 295.8 | 47.3 | 302.3 | 70.9 | 298.4 | 63.4 |
| Smooth pursuit eye-movement task: velocity gain | ||||||
| 0.25 Hz velocity | 97.1 | 4.7 | 89.9 | 10.2 | 91.24 | 8.7 |
| 0.50 Hz velocity | 84.2 | 14.4 | 78.9 | 15.9 | 82.3 | 14.4 |
| 0.75 Hz velocity | 67.4 | 20.7 | 61.1 | 23.2 | 67.3 | 20.1 |
| Smooth pursuit eye-movement task: saccadic frequency | ||||||
| 0.25 Hz velocity | 0.8 | 0.4 | 0.9 | 0.4 | 0.8 | 0.3 |
| 0.50 Hz velocity | 1.4 | 0.4 | 1.5 | 0.4 | 1.6 | 0.5 |
| 0.75 Hz velocity | 2.3 | 0.5 | 2.2 | 0.6 | 2.5 | 0.7 |
Abbreviations: FAS task (a verbal fluency task - see subjects and methods); NART, national adult reading test; SPQ, schizotypal personality questionnaire.