Several studies showed that transcranial direct current stimulation (tDCS) enhances cognition in patients with mild cognitive impairment (MCI), however, whether tDCS leads to additional gains when combined with cognitive training remains unclear. This study aims to compare the effects of a concurrent tDCS-cognitive training intervention with either tDCS or cognitive training alone on a group of patients with MCI.

The study was a 3-parallel-arm study. The intervention consisted of 20 daily sessions of 20 minutes each. Patients (n = 62) received anodal tDCS to the left dorsolateral prefrontal cortex, cognitive training on 5 cognitive domains (orientation, attention, memory, language, and executive functions), or both. To examine intervention gains, we examined global cognitive functioning, verbal short-term memory, visuospatial memory, and verbal fluency pre- and post-intervention.

All outcome measures improved after the intervention in the 3 groups. The improvement in global cognitive functioning and verbal fluency was significantly larger in patients who received the combined intervention. Instead, the intervention gain in verbal short-term memory and visuospatial memory was similar across the 3 groups.

tDCS, regardless of the practicalities, could be an efficacious treatment in combination with cognitive training given the increased effectiveness of the combined treatment.

Future studies will need to consider individual differences at baseline, including genetic factors and anatomical differences that impact the electric field generated by tDCS and should also consider the feasibility of at-home treatments consisting of the application of tDCS with cognitive training.

Obsessive-compulsive disorder (OCD) is one of the most common neuropsychiatric disorders with lifetime prevalence higher than that of schizophrenia and bipolar disorders. Inadequate response to available pharmacological and psychotherapeutic interventions is common in OCD. Adjunctive brain stimulation methods to address the inadequate treatment response in OCD have found a special interest in research. This study aimed to examine the efficacy of adjunctive deep transcranial magnetic stimulation (dTMS) in ameliorating the symptoms of OCD and the effect of dTMS on activation of brain regions while performing the Stroop task using functional magnetic resonance imaging (fMRI).

A total of 41 patients were assessed for the study out of which 15 OCD patients received 10 sessions of high-frequency dTMS using the H7 coil to target the anterior cingulate cortex and the medial prefrontal cortex over a period of 2 weeks. The Yale-Brown Obsessive-Compulsive Scale, the Hamilton Anxiety Rating Scale, and the Hamilton Depression Rating Scale were used for the pre- and post-stimulation clinical assessment. fMRI was used to measure the activation of brain regions while performing the Stroop task.

There was a significant improvement in the obsessive-compulsive, anxiety, and depressive symptoms after the 2 weeks of the dTMS treatment. A significant decrease in the activation of left caudate nucleus and adjacent white matter was noted while performing the Stroop task after the dTMS treatment.

The study provides preliminary evidence for functional correlates of effectiveness of dTMS as an adjunctive treatment modality for OCD.

Introduciton: Repetetive transcranial magnetic stimulation (rTMS) is an effective and safety noninvasive technique for treatment of major depression disorder (MDD). There is a body of increasing evidences on the potential molecular mechanisms underlying its effectivity even in case of treatment resistant depression (TRD), however, the exact mechanism is still not clarified. Among multiple biological systems, inflammation can be a target of rTMS in MDD (Tian et al. 2020; Tateishi et al. 2020).

Here we analysed serum cytokine levels in TRD before and after rTMS interventions.

We used bilateral stimulation (15Hz for left DLPC and 1Hz on the right side) in 18 patients with TRD (5 men and 13 women; mean age=47.7±12.1 year) for 2x5 days. Blood samples were collected before the first (V1) and after the last inetrevntion (V2). Phenotypic changes were measured by Beck Depression Inventory (BDI), Beck Anxiety Inventory (BAI), Snaith–Hamilton Pleasure Scale (SHAPS), Insomnia Severity Index (ISI) and Stroop Color-Word Test (SCWT) modified by Golden. Inflammatory cytokines were assessed by ELISA assays.

Change of BDI and BAI scores between V1 and V2 is associated with difference of TNFalpha levels (p=0.043; adj.R2=0.42 p=0.011; adj R2=0.43). Decrease on SHAPS score has been depended on IL-6 level (p=0.027) and the interaction of TNFalpha and IL-10 (p=0.005; adj R2=0.63). Sleep disturbance and neurocognitive function was not associated with cytokine levels.

Our results confirmed the association between depressive, anxious and anhedonia symptom improvement and inflammatory mechansims during rTMS treatment. The study was supported by the OTKA 151513 grant.