Decoding two-dimensional movement trajectories using electrocorticographic signals in humans.

TitleDecoding two-dimensional movement trajectories using electrocorticographic signals in humans.
Publication TypeJournal Article
Year of Publication2007
AuthorsSchalk, G, Kubánek, J, Miller, JW, Anderson, NR, Leuthardt, EC, Ojemann, JG, Limbrick, D, Moran, D, Gerhardt, LA, Wolpaw, J
JournalJ Neural Eng
Date Published09/2007
KeywordsAdult, Algorithms, Arm, Brain Mapping, Cerebral Cortex, Electroencephalography, Evoked Potentials, Motor, Female, Humans, Male, Movement

Signals from the brain could provide a non-muscular communication and control system, a brain-computer interface (BCI), for people who are severely paralyzed. A common BCI research strategy begins by decoding kinematic parameters from brain signals recorded during actual arm movement. It has been assumed that these parameters can be derived accurately only from signals recorded by intracortical microelectrodes, but the long-term stability of such electrodes is uncertain. The present study disproves this widespread assumption by showing in humans that kinematic parameters can also be decoded from signals recorded by subdural electrodes on the cortical surface (ECoG) with an accuracy comparable to that achieved in monkey studies using intracortical microelectrodes. A new ECoG feature labeled the local motor potential (LMP) provided the most information about movement. Furthermore, features displayed cosine tuning that has previously been described only for signals recorded within the brain. These results suggest that ECoG could be a more stable and less invasive alternative to intracortical electrodes for BCI systems, and could also prove useful in studies of motor function.

Alternate JournalJ Neural Eng
PubMed ID17873429

You are here