title: A modified mirror projection visual evoked potential stimulator for presenting patterns in different orientations.
abstract: Modifications to a standard mirror projection visual evoked potential stimulator are described to enable projection of patterns in varying orientations. The galvanometer-mirror assembly is mounted on an arm which can be rotated through 90 degrees. This enables patterns in any orientation to be deflected perpendicular to their axes.
mesh_terms: D004569:Electroencephalography / Q000295:instrumentation*; D005074:Evoked Potentials, Visual