Effects of supraspinal feedback on human gait: rhythmic auditory distortion.

Background: Different types of sound cues have been used to adapt the human gait rhythm. We investigated whether young healthy volunteers followed subliminal metronome rhythm changes during gait.

Methods: Twenty-two healthy adults walked at constant speed on a treadmill following a metronome sound cue (period 566 msec).

Optimal autoregressive orders for myopathic electromyograms.

This paper aims to describe the optimal autoregressive order of varying-length electromyograms for myopathic subjects. Epochs of electromyography signals are modeled as outputs of autoregressive systems, for orders varying from 1 to 100. The optimal order to represent each epoch is chosen by the minimum description length criterion.

Compression of high-density EMG signals for trapezius and gastrocnemius muscles.

Background: New technologies for data transmission and multi-electrode arrays increased the demand for compressing high-density electromyography (HD EMG) signals. This article aims the compression of HD EMG signals recorded by two-dimensional electrode matrices at different muscle-contraction forces. It also shows methodological aspects of compressing HD EMG signals for non-pinnate (upper trapezius) and pinnate (medial gastrocnemius) muscles, using image compression techniques.

Epoch length and autoregressive-order selection for electromyography signals.

This study shows how different EMG-epoch lengths affect the selection of the autoregressive-model orders. Electromyography signals were divided in 25ms, 50ms, 100ms, 250ms and 500ms epochs. Order-selection criteria were applied to the least-square errors of autoregressive models.

Influence of evoked response latency and amplitude on stimulus artifact removal.

The removal of stimulus artifacts is a challenge not only to evoked potentials but also to other electrically-elicited signals such as M wave and direct cortical responses. Several techniques try to remove stimulus artifacts. However, the influence of the amplitude ratio between signal and artifact has not been reported yet.