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. 2010 Apr 14;103(6):3535–3546. doi: 10.1152/jn.00956.2009

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Fig.4. — EWA-based thresholding and EWA shifts as a function of task direction. A: the EWA direction is essentially random when the muscle as little activity and becomes focused along the muscle's direction of action only when the EMG activity is greater. EMG threshold is determined so that the SD of EWA direction across above-threshold trials (●) is ∼25°. Below-threshold trials are shown as light points. B: a plot of EWA direction vs. task direction for above-threshold (●) and below-threshold () trials. A linear fit (—) to the above-threshold trials illustrates small but predictable shifts in EWA direction with changes in task direction.

Inline graphic — EWA-based thresholding and EWA shifts as a function of task direction. A: the EWA direction is essentially random when the muscle as little activity and becomes focused along the muscle's direction of action only when the EMG activity is greater. EMG threshold is determined so that the SD of EWA direction across above-threshold trials (●) is ∼25°. Below-threshold trials are shown as light points. B: a plot of EWA direction vs. task direction for above-threshold (●) and below-threshold () trials. A linear fit (—) to the above-threshold trials illustrates small but predictable shifts in EWA direction with changes in task direction.