Healthy subjects will undergo cathodal stimulation of the right posterior parietal Cortex (PPC) and assessment of neglect-like symptoms in the encircling monitor system (EMS) as well as in a standard clinical test (Test Battery for Attention Performance, TAP, Zimmermann & Fimm, 1993). The aim of this study is to investigate whether cathodal stimulation leads to poorer test performance.

Inclusion Criteria:

• Younger subjects

  • aged between 18 and 35 years
  • ability to provide written informed consent
  • right-handedness

• Elderly subjects

  • aged between 50 and 85 years
  • ability to provide written informed consent
  • right-handedness

Exclusion Criteria:

- Exclusion criteria for both groups:

• serious psychiatric disorders (including depression, psychosis) in the past
• severe neurological disorders (such as epilepsy, dementia, stroke) in the past
• current severe medical disorder
• drugs, medication or alcohol abuse at the time of the study
• severe traumatic brain injury or tumor in the past
• operations on the brain, trepanations
• metallic implants in the head / neck area (except in the mouth), such as screws, splinter, artificial cochlea, electrodes
• severe skin diseases (like eczema) or very sensitive skin in the head region in the past
• epilepsy in the family
• current use of neuroleptics, antiepileptics, antidepressants, L-dopa, benzo-diazepines
• current pregnancy or lactation
• current claustrophobia