title: Using real-time fMRI to control a dynamical system by brain activity classification.
abstract: We present a method for controlling a dynamical system using real-time fMRI. The objective for the subject in the MR scanner is to balance an inverted pendulum by activating the left or right hand or resting. The brain activity is classified each second by a neural network and the classification is sent to a pendulum simulator to change the force applied to the pendulum. The state of the inverted pendulum is shown to the subject in a pair of VR goggles. The subject was able to balance the inverted pendulum during several minutes, both with real activity and imagined activity. In each classification 9000 brain voxels were used and the response time for the system to detect a change of activity was on average 2-4 seconds. The developments here have a potential to aid people with communication disabilities, such as locked in people. Another future potential application can be to serve as a tool for stroke and Parkinson patients to be able to train the damaged brain area and get real-time feedback for more efficient training.
authors.affiliation: Div. of Medical Informatics, Linköping University, Sweden. andek@imt.liu.se
authors.forename: Anders
authors.initials: A
authors.lastname: Eklund
authors.forename: Henrik
authors.initials: H
authors.lastname: Ohlsson
authors.forename: Mats
authors.initials: M
authors.lastname: Andersson
authors.forename: Joakim
authors.initials: J
authors.lastname: Rydell
authors.forename: Anders
authors.initials: A
authors.lastname: Ynnerman
authors.forename: Hans
authors.initials: H
authors.lastname: Knutsson
mesh_terms: D000465:Algorithms; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping / Q000379:methods*; D003199:Computer Systems; D005071:Evoked Potentials / Q000502:physiology*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity