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Facial EMG & Startle Response

Facial electromyography (fEMG) typically uses surface EMG electrodes to detect activity at the zygomaticus (cheek), orbicularis oculi (under eye), and/or corrugator supercilii (brow) muscle regions as a participant is exposed to a stimulus, such as sounds, pictures, or smells for psychophysiology or neuromarketing studies.BIOPAC fEMG electrodes

 

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To perform multiple stimulus paradigms for Startle Response applications, use the STM100C stimulator and the MP System Control channels. Present a pre-defined auditory stimulus or stimulate the subject based on the result of a physiological response. Turn on lights or generate tones for detailed reaction time studies. Auditory stimuli can also be used to deliver auditory stimuli for startle response paradigms. The eye blink response is captured after the sound is delivered to the subject. Use a wired or wireless EMG amplifier and surface EMG electrodes to record facial EMG (eyeblinks); for MRI protocols, record zygomaticus activity with an MR Safe pressure pad transducer (see TSD110-MRI and Application Note 235). Set the software to integrate the signal on-line. Calculate the time and amplitude of the response using the measurement tools. Automate analysis with the Peak Detection features and display the results as a new channel.

Alternatively, the auditory stimuli can be delivered from a presentation system such as E-Prime or SuperLab and the automated stimulus analysis software can be used to calculate the latency and amplitude of the response. AcqKnowledge will convert the trigger marks from the presentation system into software events and then AcqKnowledgewill use the events as part of the Stim-Response Analysis routine. AcqKnowledge can also interface with third-party stimulators including transcranial magnetic stimulation. The software also interfaces with the major presentation systems for the delivery and timing of the stimulus delivery.

Startle response stim response analysis dialog

Application Notes

276 – Emotional State Recognition via Physiological Measures & Processing

235 – Zygomaticus Measures with Pressure Pad vs. EMG in MRI or fMRI

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Hardware Packages   |   Facial EMG & Startle Response

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