Abstract
Objctive: Repetitive transcranial magnetic stimulation (rTMS) to the temporoparietal region has been proposed as a therapeutic option for auditory verbal hallucinations (AVH). However, most large randomized controlled trials failed to demonstrate a superior effect of rTMS treatment as compared to sham. Previous studies applied daily rTMS sessions for one or more weeks to summate its effects. However, the effect of a single rTMS treatment on AVH-severity has never been studied, making it unclear if there is an initial effect that could be increased by repeated treatment. Methods: In three separate sessions, twenty-four patients with a psychotic disorder received 1-Hz rTMS to the left temporoparietal cortex, its right-sided homologue or a centro-occipital control site. Severity of AVH was assessed before and after each rTMS session and resting-state EEGs were recorded to investigate the neuronal effects of rTMS. Results: Stimulation of the temporoparietal cortices was not more effective in reducing AVH-severity than control-site stimulation. In addition, EEG-related power and connectivity measures were not affected differently across stimulation sites and changes in neuronal activity did not correlate with changes in AVH-severity. Conclusions: These results may suggest a placebo effect of a single session of 1-Hz rTMS treatment on AVH-severity.
| Original language | English |
|---|---|
| Pages (from-to) | 174-179 |
| Number of pages | 6 |
| Journal | Schizophrenia Research |
| Volume | 137 |
| Issue number | 1-3 |
| DOIs | |
| State | Published - May 2012 |
| Externally published | Yes |
Keywords
- EEG
- Graph analysis
- Hallucinations
- Placebo
- Schizophrenia
- TMS