Classification of prefrontal and motor cortex signals for three-class fNIRS–BCI

• Published in: Neuroscience letters Vol. 587; pp. 87 - 92
• Main Authors: Hong, Keum-Shik, Naseer, Noman, Kim, Yun-Hee
• Format: Journal Article
• Language: English
• Published: Ireland Elsevier Ireland Ltd 05.02.2015
• Subjects: Adult; Brain-computer interface; Brain-Computer Interfaces; Discriminant Analysis; Feasibility Studies; Functional Laterality; Functional near-infrared spectroscopy; Humans; Imagination; Linear discriminant analysis; Linear Models; Male; Motor Activity; Motor Cortex - physiology; Motor imagery; Prefrontal Cortex - physiology; Problem Solving; Spectroscopy, Near-Infrared; Brain-computer interface; Motor imagery; Linear discriminant analysis; Functional near-infrared spectroscopy
• ISSN: 0304-3940; 1872-7972; 1872-7972
• DOI: 10.1016/j.neulet.2014.12.029

•Feasibility of three-class fNIRS–BCI demonstrated.•Classification of fNIRS signals corresponding to three different brain activities.•Motor and prefrontal cortex activities used.•Intentionally-generated cognitive tasks as inputs. Functional near-infrared spectroscopy (fNIRS) is an optical imaging method that can be used for a brain-computer interface (BCI). In the present study, we concurrently measure and discriminate fNIRS signals evoked by three different mental activities, that is, mental arithmetic (MA), right-hand motor imagery (RI), and left-hand motor imagery (LI). Ten healthy subjects were asked to perform the MA, RI, and LI during a 10s task period. Using a continuous-wave NIRS system, signals were acquired concurrently from the prefrontal and the primary motor cortices. Multiclass linear discriminant analysis was utilized to classify MA vs. RI vs. LI with an average classification accuracy of 75.6% across the ten subjects, for a 2–7s time window during the a 10s task period. These results demonstrate the feasibility of implementing a three-class fNIRS-BCI using three different intentionally-generated cognitive tasks as inputs.