This test objectively quantifies how information on self-motion in space is integrated by the brain. The aim is to find out whether disorientation, dizziness and nausea after a concussion are caused by an imbalance in the processing of information on self-motion from the visual system (i.e. seeing a movement as it happens on the train when looking at the passing train through the window) and/or the vestibular system (which detects the actual movement but only works optimally for fast, short head movements).
The patient sits comfortably on a rotating chair surrounded by a completely closed drum (2D rotating chair). During the test, the patient experiences a series of relatively slow, passive turns (1 turn in 6 seconds).
A concussion can lead to an improved response to visual movement stimuli making people more sensitive to visual stimuli that are normally filtered by the brain (e.g. scrolling the phone, watching TV, going to supermarkets). This so-called “hypersensitivity” can be objectified by 2D-evaluation and treated by desensitization.