Retinal contributions to photic blink EMG and how to remove them

Bos, A.R.; Boelhouwer, A.J.W.; Berg-Lenssen, M.M.C. van den; Brunia, C.H.M.

doi:10.1037/e526132012-089

Cited by 2 publications

(3 citation statements)

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“…The spectrum may be expected to shift to lower frequencies when the ERG is recorded from the orbicularis oculi muscle due to an increased distance to the potential source~cf., Lindström & Magnusson, 1977;Lindström & Petersén, 1983!. The ERG also contains a faster, oscillatory potential with a frequency distribution ranging from 100 to 200 Hz but this potential precedes the photic R50 component~Bos, Boelhouwer, Van den Berg-Lenssen, & Brunia, 1996;Gur & Zeevi, 1980! and thus will not be problematic under the current photic stimulation conditions.…”

Section: Discussionmentioning

confidence: 99%

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

Boxtel¹,

BOELHOUWER²,

BOS³

1998

Psychophysiol.

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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.

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Section: Discussionmentioning

confidence: 99%

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

Boxtel¹,

BOELHOUWER²,

BOS³

1998

Psychophysiol.

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 99%

“…high-pass filtering of the EMG signal, or~c! a combination of both Bos et al, 1996;Hackley & Johnson, 1996!. The most rigorous approach, combining 100-Hz high-pass filtering and occlusion of the eye~Hackley & Johnson, 1996!, may be expected to be effective but will also produce a great loss of EMG signal power.…”

Section: Discussionmentioning

confidence: 99%