Table 4 Frequency of symptoms included in the Cox and Swinson depersonalisation/derealisation inventory (2002).
| Depersonalisation/derealisation symptoms | Healthy subjects | Vestibular patients | ||
|---|---|---|---|---|
| Before calorics | During calorics | Before calorics | During Calorics | |
| 1. Surroundings seem strange and unreal** | 10% | 40%* | 35% | 45% |
| 2. Time seems to pass very slowly** | 30% | 70%* | 40% | 45% |
| 3. Body feels strange/different in some way** | 10% | 50%* | 55% | 60% |
| 4. Feel like you've been here before (déjà vu)** | 40% | 10%* | 30% | 20% |
| 5. Feel as though in a dream | 10% | 10% | 30% | 20% |
| 6. Body feels numb** | 0% | 20% | 15% | 10% |
| 7. Feeling of detachment or separation from surroundings | 10% | 50%* | 30% | 55% |
| 8. Numbing of emotions | 10% | 10% | 20% | 10% |
| 9. People and objects seem far away | 10% | 30% | 20% | 15% |
| 10. Feeling detached or separated from body | 10% | 30% | 15% | 25% |
| 11. Thoughts seem blurred | 30% | 20% | 40% | 45% |
| 12. Events seem to happen in slow motion | 20% | 20% | 15% | 20% |
| 13. Your emotions seem disconnected from yourself | 10% | 10% | 15% | 20% |
| 14. Feeling of not being in control of self** | 20% | 40% | 35% | 40% |
| 15. People appear strange or unreal | 10% | 10% | 15% | 15% |
| 16. Dizziness** | 20% | 90%* | 85% | 90% |
| 17. Surroundings appear covered with a haze | 10% | 10% | 35% | 30% |
| 18. Vision is dulled | 10% | 20% | 45% | 35% |
| 19. Feel as if walking on shifting ground | 0% | 20% | 60% | 50% |
| 20. Difficulty understanding what others say to you | 20% | 10% | 35% | 20% |
| 21. Difficulty focusing attention | 30% | 40% | 45% | 35% |
| 22. Feel as though in a trance | 10% | 20% | 25% | 30% |
| 23. The distinction between close and distant is blurred | 10% | 10% | 10% | 20% |
| 24. Difficulty concentrating** | 30% | 30% | 50% | 30% |
| 25. Feel as though your personality is different | 20% | 10% | 10% | 10% |
| 26. Feel confused or bewildered | 10% | 20% | 30% | 25% |
| 27. Feel isolated from the world** | 10% | 30% | 20% | 20% |
| 28. Feel “spacey” or “spaced out” | 10% | 40%* | 30% | 50% |
Reported by 20 healthy subjects and 20 vestibular patients, before and during caloric stimulation, within each group (*) and between group changes (**) p<0.05.