Abstract: For simplifying the application of electrical stimulation and/or recording of the human brain for therapeutical or diagnostic purposes, an electrode helmet (1) and associated fabrication techniques are provided. The helmet (1) is stable in shape, can be designed to carry a varying number of m electrodes (3) and has a patient-specific geometry that defines the relative position of each electrode with respect to the brain of the patient wearing the helmet (1). This approach improves the accuracy in stimulation and recording as well as the wearing comfort for the patient and allows tailor-made therapy and diagnostic with a component that can be customized at low costs based on a standard design.