In the first experimental group, the TDCS intervention protocol consists of 10 sessions of 20 minutes of 1 mA electrical stimulation on 5 consecutive days with two sessions per day.

In the second experimental group, the TDCS intervention protocol consists of 10 sessions of 20 minutes of 2 mA electrical stimulation on 5 consecutive days with two sessions per day.

In the placebo group, the TDCS intervention protocol consists of 10 sessions of 20 minutes of sham electrical stimulation on 5 consecutive days with two sessions per day.

Patients will receive 10 sessions of 20 minutes of either 1 mA, 2 mA or sham electrical stimulation on 5 consecutive days

Score in the Yale-Brown Obsessive-Compulsive (Y-BOCS). Total scores on the measure range from 0 to 40, with a score of 0-7 indicating subclinical symptoms, 8-15 mild symptoms, 16-23 moderate symptoms, 24-31 severe symptoms and 32-40 extreme symptoms.

Score in the Beck Anxiety Questionnaire (BAI). The BAI scores are classified as minimal anxiety (0 to 7), mild anxiety (8 to 15), moderate anxiety (16 to 25), and severe anxiety (30 to 63).

Performance in the response inhibition tasks (Flanker test)

Performance in the working memory task as an executive function task

Performance in the response inhibition tasks (Go/No-Go task)

Score in the Beck Depression Questionnaire (BDI-II). The BDI-II scores are classified as below:

Score of 1-10: These ups and downs are considered normal. Score of 11-16: Mild mood disturbance. Score of 17-20: Borderline clinical depression. Score of 21-30: Moderate depression. Score of 31-40: Severe depression. Score of 40+ Extreme depression.