During both session, blood pressure will be monitored and an assessment of general mood will be performed by the Positive and Negative Affect Schedule (PAS and NAS, also PANAS) and the State-Trait Anxiety Inventory (STAI state) questionnaires before and after the stimulation tests. The PANAS consists of a number of words that describe different feelings and emotions at the present moment. The STAI state is validated, and widely used questionnaire measuring transitory anxiety states. The scale consists of 20 items, which are answered on a 4-point scale. Scores are expressed as total sum scores.