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EEG-Based Communication: Evaluation of Alternative Signal Prediction Methods - EEG-basierte Kommunikation: Evaluierung alternativer Methoden zur Signalprädiktion by H. Ramoser; J. R. Wolpaw; G. Pfurtscheller is a Medicine article available to read on EtoBox.

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Key words: Prosthesis -rehabilitation -assistive communication -mu rhythm -electroencephalography Individuais can learn to control the amplitude of EEG activity in specific frequency bands over sensorimotor cortex and use it to move a Cursor to a target on a Computer screen. For one-dimensional (i.e., vertical) Cursor movement, a linear equation translates the EEG activity into Cursor movement. To translate an individual's EEG control into Cursor control äs effectively äs possible, the intercept in this equation, which determines whether upward or downward movement occurs, should be set so that top and bottom targets are equally accessible. The present study compares alternative methods for using an individual's previous performance to select the intercept for subsequent trials. In offline analyses, five different intercept selection methods were applied to EEG data collected while trained subjects were moving the Cursor to targets at the top or bottom edge of the screen. In the first two methods -moving average, and weighted sum -a single intercept was selected for the entire 1-2 sec period of each trial. In the other three methods -blocked moving average, blocked weighted sum, an

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Author

H. Ramoser; J. R. Wolpaw; G. Pfurtscheller

Publisher

Walter de Gruyter GmbH

Published

1997

Language

EN

Field

Medicine (Health Sciences)