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Objectives: Although high-frequency repetitive transcranial magnetic stimulation (HF-rTMS) over the left dorsolateral prefrontal cortex (DLPFC) has been reported to improve mood symptoms in major depressive disorder (MDD), research on its impact on psychomotor symptoms is scarce. This study assessed the psychomotor effects of 1 and 10 sessions, respectively, of HF-rTMS over the left DLPFC., Methods: Ten HF-rTMS sessions were applied in 21 medication-free MDD patients over a 2-week period. At the beginning, one placebo (sham)-controlled rTMS session was also applied in a cross-over, single-blind design. Psychomotor variables were digitally recorded during completion of a Fitts' task, at baseline, after the first and second real/sham session and at the end point., Results: The total 10-session treatment period resulted in a decrease of depression severity. One HF-rTMS session resulted in improvements on the Fitts' task, without a difference between active and sham stimulation, however. No further improvements occurred from session 2 to session 10., Conclusions: No evidence was provided to link the observed psychomotor improvements to HF-rTMS stimulation, as a practice effect could have impacted the significant psychomotor outcomes., (Copyright © 2012 S. Karger AG, Basel.)

Background: The rs1344706 single nucleotide polymorphism in the ZNF804A gene is a common variant with strong evidence for association with schizophrenia. Recent studies show an association of rs1344706 with cognitive functioning, and there is some evidence suggesting that the risk allele may increase susceptibility for a subtype of schizophrenia with relatively spared cognition., Methods: We tested the effect of rs1344706 genotype in 89 schizophrenia patients on 3 basic cognitive domains (working memory, processing speed and attention) shown to be severely impaired in schizophrenia. Also we investigated the effect of rs1344706 on the severity of neurological soft signs, subtle impairments in motor and sensory functions highly frequent in schizophrenia patients. Neurological soft signs and cognitive deficits are central features of schizophrenia and are tightly linked with clinical, social and functional outcome., Results: Our results show an association of higher rs1344706 risk allele load with improved performance on processing speed and with fewer neurological soft signs., Conclusions: Together with other studies, our findings suggest that ZNF804A is associated with a subtype of schizophrenia with better cognitive and neurological functioning. Discovery of the specific pathways through which ZNF804A is exerting this effect may lead to better prevention, diagnosis and treatment for a specific group of schizophrenia patients., (Copyright © 2012 S. Karger AG, Basel.)

Background: Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive tool to investigate neural conduction in motor processes. Most rTMS research has been conducted by targeting the primary motor cortex. Several studies have also found increased psychomotor speed after rTMS of the dorsolateral prefrontal cortex (DLPFC). However, these studies were mainly performed in psychiatric patients, only targeting the left DLPFC, and often without sham control. Moreover, psychomotor speed is mostly measured based on tasks that also require higher executive functions., Methods: Here, we examined the lateralized effect of one sham-controlled high-frequency rTMS session applied to the left or right DLPFC on fine motor function in 36 healthy right-handed females, using the Fitts' paradigm., Results: We found a significant improvement in psychomotor speed only after actively stimulating the right DLPFC., Conclusion: Our results support the assumption of a right prefrontal neural network implicated in visuomotor behavior and performance processes, and that the improvement in psychomotor speed is not a secondary effect of decreased mood., (Copyright © 2012 S. Karger AG, Basel.)

Background: There is a relative scarcity of studies on major depressive disorder that use objective assessment methods to explore the psychomotor effects of antidepressants. Striatal dopaminergic disturbances are known to be involved in the pathogenesis of major depressive disorder that is associated with psychomotor retardation. Because of its additional dopaminergic mechanism, the psychomotor effects of the selective serotonin reuptake inhibitor sertraline merit further exploration., Methods: In 19 patients diagnosed with a current major depressive episode, clinical variables and graphic motor activity were assessed applying digitized figure copying tasks during a 6-week regimen of sertraline. Patients' baseline and weekly psychomotor performance was compared with the outcomes of 22 healthy, unmedicated controls., Results: Patients' psychomotor slowing had improved after 6 weeks on sertraline as reflected by reductions in initiation and movement times on the simple line and figure copying tasks and decreased initiation times for the complex figure copying task relative to their baseline outcomes., Conclusions: The current study found evidence pointing to potential beneficial effects of sertraline after a 6-week treatment period in the lower-order cognitive and motor components involved in the graphic motor performance of depressed patients. The present findings are discussed in terms of the mechanism of action of sertraline., (Copyright 2009 S. Karger AG, Basel.)