title: An unobtrusive measurement method of the horizontal gaze angle.
abstract: A horizontal gaze angle measurement device is introduced. By combining a photoelectric viewing device to measure the horizontal eye angle with a similar head angle measurement device, it is possible to measure the horizontal gaze angle without using a headrest. After discussion of circuit diagrams and measurement principles, it is shown that the measurements made with the device yield a reasonable precision. The mean absolute measurement error is below 1 degree. This inexpensive and unobtrusive device covers a visual field of about 20 degrees and can be used in parallel with many tasks. Further, data on the successful application of the device in a driving simulation setting are discussed.
authors.affiliation: Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Germany. andreas.muehlberger@med.uni-tuebingen.de
authors.forename: A
authors.initials: A
authors.lastname: Mühlberger
authors.forename: J A
authors.initials: JA
authors.lastname: Reiss
mesh_terms: D000328:Adult; D001334:Automobile Driving; D003198:Computer Simulation; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation; D005133:Eye Movements / Q000502:physiology*; D005260:Female; D019416:Head Movements / Q000502:physiology*; D006801:Humans; D008297:Male; D012044:Regression Analysis; D015203:Reproducibility of Results; D015348:Vision, Binocular / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*