Correction
The figure in the August 2011 letter “Muting the Voice: A Case of Arterial Spin Labeling-Monitored Transcranial Direct Current Stimulation Treatment of Auditory Verbal Hallucinations” by Philipp Homan, M.D., et al. (Am J Psychiatry 2011; 168:853-854) was incorrectly labeled. The unit of the cerebral blood flow (CBF) should be [ml/100g/min] instead of [ml/100kg/min].