Optimal EMG signal bandwidth and interelectrode distance for the recording of acoustic, electrocutaneous, and photic blink reflexes.

The bandwidth for the recording of the orbicularis oculi blink reflex electromyogram (EMG) response is optimal when low-frequency artifacts, such as motion artifacts and cross-talk from other muscles, are maximally suppressed, whereas true EMG signal power is maximally retained. The optimal bandwidth was investigated for acoustic, electrocutaneous, and photic blink reflexes. Reflexes were recorded with varying bandwidth and interelectrode distances of 12 and 36 mm. Power spectra of the EMG signals were calculated and compared with a theoretical spectrum of the uncontaminated EMG signal. For both electrode distances, the optimal bandwidth was on the average 28-500 Hz for acoustic and electrocutaneous blink reflexes and 12-500 Hz for photic blinks. Using photic stimuli, however, a high-pass filter frequency larger than 12 Hz (probably at least 30 Hz) in combination with occlusion of the eye will be necessary to avoid influences of retinal potentials. Given the optimal bandwidth, a larger electrode spacing may be expected to moderately improve the detectability of small blinks in all stimulus conditions.

[1]  R. Scott,et al.  A Nonstationary Model for the Electromyogram , 1977, IEEE Transactions on Biomedical Engineering.

[2]  F. Harris.  On the use of windows for harmonic analysis with the discrete Fourier transform , 1978, Proceedings of the IEEE.

[3]  S. Hackley,et al.  Distinct early and late subcomponents of the photic blink reflex: response characteristics in patients with retrogeniculate lesions. , 1996, Psychophysiology.

[4]  S. Hackley,et al.  Prepulse effects on the photic eyeblink reflex: evidence for startle-dazzle theory. , 1997, Psychophysiology.

[5]  L.H. Lindstrom,et al.  Interpretation of myoelectric power spectra: A model and its applications , 1977, Proceedings of the IEEE.

[6]  S. Hillyard,et al.  Cross-modal selective attention effects on retinal, myogenic, brainstem, and cerebral evoked potentials. , 1990, Psychophysiology.

[7]  L D Silverstein,et al.  Eyeblink EMG: a miniature eyelid electrode for recording from orbicularis oculi. , 1978, Psychophysiology.

[8]  C. Grillon,et al.  Acoustic startle and anticipatory anxiety in humans: effects of monaural right and left ear stimulation. , 1995, Psychophysiology.

[9]  Signal attenuation as a function of integrator time constant and signal duration. , 1994, Psychophysiology.

[10]  M. Dawson,et al.  Probing the orienting response with startle modification and secondary reaction time. , 1994, Psychophysiology.

[11]  Lambert Schomaker,et al.  Motor Unit Firing Rate During Static Contraction Indicated by the Surface EMG Power Spectrum , 1983, IEEE Transactions on Biomedical Engineering.

[12]  M. Dawson,et al.  The effect of repeated propulse—blink reflex trials on blink reflex modulation at short lead intervals , 1994, Biological Psychology.

[13]  J. Webster,et al.  The origin of skin-stretch-caused motion artifacts under electrodes. , 1996, Physiological measurement.

[14]  G A Miller,et al.  Digital filtering: background and tutorial for psychophysiologists. , 1992, Psychophysiology.

[15]  C. D. De Luca,et al.  Frequency Parameters of the Myoelectric Signal as a Measure of Muscle Conduction Velocity , 1981, IEEE Transactions on Biomedical Engineering.

[16]  J. Bendat,et al.  Random Data: Analysis and Measurement Procedures , 1971 .

[17]  R. Merletti,et al.  Electrically evoked myoelectric signals. , 1992, Critical reviews in biomedical engineering.

[18]  M. Bradley,et al.  Lateralized startle probes in the study of emotion. , 1996, Psychophysiology.

[19]  C. J. Luca.  Myoelectrical manifestations of localized muscular fatigue in humans. , 1984 .

[20]  M. Dawson,et al.  The varying time courses of attentional and affective modulation of the startle eyeblink reflex. , 1996, Psychophysiology.

[21]  B. Widrow,et al.  On the Nature and Elimination of Stimulus Artifact in Nerve Signals Evoked and Recorded Using Surface Electrodes , 1982, IEEE Transactions on Biomedical Engineering.

[22]  C. Braun,et al.  Emotional qualities of odors and their influence on the startle reflex in humans. , 1994, Psychophysiology.

[23]  Y. Zeevi,et al.  Frequency-domain analysis of the human electroretinogram. , 1980, Journal of the Optical Society of America.

[24]  Carlo J. De Luca,et al.  The Use of Surface Electromyography in Biomechanics , 1997 .

[25]  Carlo J. De Luca,et al.  Physiology and Mathematics of Myoelectric Signals , 1979 .

[26]  S. Hackley,et al.  The more or less startling effects of weak prestimulation - Revisted : Prepulse modulation of multicomponent blink reflexes , 1997 .

[27]  S. Vrana.  Emotional modulation of skin conductance and eyeblink responses to startle probe. , 1995, Psychophysiology.