Basic principles of deep brain stimulation.- Neural circuits affected by DBS for psychiatric disorders.- Mechanisms of action of SBS for psychiatric disorders.- DBS for obsessive-compulsive disorder.- Obsessive-compulsive disorders in animals.- Subcallosal cingulate cortex DBS for treatment resistant mood disorders.- DBS to the human reward system as a putative treatment for refractory major depression.- DBS in animal models of depression.- DBS in Tourette syndrome.- Surgical treatments for drug addictions in humans.- Manipulating addictive behaviour in animal models.- Neuropsychiatric side effects of DBS in Parkinson's disease.- Psychiatric aspects of Parkinson's disease in animal models.- Scientific recordings in DBS.- Neurotransmitter release during DBS.- The potential role of non-neuronal cells in the DBS mechanism.- What are glia? Could they be players in DBS.- Animal studies in DBS research.- Neuroimaging of DBS in psychiatric disorders.- Optogenetic strategies for neuropsychiatric disorders: Circuit-function analysis and clinical implications.- Next generation electrodes for steering brain stimulation.- Future applications: nanotechniques.- Ethical guidance for the use of DBS in psychiatric trials and emerging uses: Review and reflections.