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Goal selection versus process control in a brain–computer interface based on sensorimotor rhythms

Audrey S Royer1 and Bin He1,2

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In a brain–computer interface (BCI) utilizing a process control strategy, the signal from the cortex is used to control the fine motor details normally handled by other parts of the brain. In a BCI utilizing a goal selection strategy, the signal from the cortex is used to determine the overall end goal of the user, and the BCI controls the fine motor details. A BCI based on goal selection may be an easier and more natural system than one based on process control. Although goal selection in theory may surpass process control, the two have never been directly compared, as we are reporting here. Eight young healthy human subjects participated in the present study, three trained and five naïve in BCI usage. Scalp-recorded electroencephalograms (EEG) were used to control a computer cursor during five different paradigms. The paradigms were similar in their underlying signal processing and used the same control signal. However, three were based on goal selection, and two on process control. For both the trained and naïve populations, goal selection had more hits per run, was faster, more accurate (for seven out of eight subjects) and had a higher information transfer rate than process control. Goal selection outperformed process control in every measure studied in the present investigation.


PACS

87.85.Ng Biological signal processing

87.19.R- Mechanical and electrical properties of tissues and organs

87.19.lt Sensory systems: visual, auditory, tactile, taste, and olfaction

87.19.L- Neuroscience

07.05.Wr Computer interfaces

Subjects

Instrumentation and measurement

Medical physics

Biological physics

Dates

Issue 1 (February 2009)

Received 4 November 2008, accepted for publication 11 December 2008

Published 20 January 2009



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