Optical EEG for Man-Machine-Interfaces

Optical EEG for Man-Machine-Interfaces

Niels-Ole Rohweder, M.Sc.

State of the art / Motivation

  • Measuring brain activity by electroencephalography (EEG) is the "gold standard" for determining various physical and psychological states such as fatigue, attention, distraction
  • Up to now, current EEG procedures have relied on expensive and contact-based methods, which limit the possible applications, e.g. in robotics or semi-autonomous vehicles
  • An alternative, non-contact method consists of measuring the pupil diameter with a camera, which correlates on medium and long time scales (> 30s) with brain activity in certain areas and frequency bands



  • Development of a precise algorithm for determining the pupil diameter from camera images, based on ellipse detection
  • Realization of an experimental setup, consisting of lighting, camera and EEG and stimulus generator
  • Investigation of the influence of lighting
  • Quantifying the sensitivity resp. the noise floor
  • Conducting various correlation measurements with test persons


  • Construction of a high-resolution, sub-micrometer pupilometer
  • Design of a Brain-Computer-Interface by using luminance stimuli (pupillary light reflex) at 2-7 Hz


Currently, the following Master projects are available:

Niels-Ole Rohweder, M.Sc.

Wissenschaftlicher Mitarbeiter

Tel.: +49 5323 72-5234
E-Mail: rohweder@iei.tu-clausthal.de