Facial EMG
Facial EMG can be paired with the LabScribe Experiment Builder and Video capture module.
Some of the advantages of using Facial EMG are:
- It is a precise and sensitive method to measure emotional expression.
- It is capable of registering the response even when subjects were instructed to inhibit their emotional expression.
- It is able to measure facial muscle activities to even weakly evocative emotional stimuli.
- Less intrusive than other physiological measures like fMRI and EEG.
Wireless
The iWorx ROAM is a versatile, wireless system with 8+ hours of continuous recording, 20ft range provides long-term recording and unrestricted movement.
LabScribe EMG Analysis Module
The iWorx LabScribe EMG Software Module is a robust and intuitive tool designed to effortlessly streamline the analysis of EMG data across a wide range of species.
Measurements
- SEMG Measurements
- Maximal Voluntary Contraction (MVC)
- Muscle Force
- Fatigue
- Recruitment
- Summation
- Incomplete Tetanus
- Complete Tetanus
- H-Reflex
Analysis
- Root Mean Square (RMS)
- Regarded as the most common method for assessing the amplitude of the EMG signal, as it offers a measure of the signal’s power and generates a waveform that is easy to analyze
- Maximum Voluntary Contraction (MVC)
- A widely used measure of muscle strength in research. It represents the greatest force a person can voluntarily produce, reflecting their maximum effort
- (Average) Rectified EMG Data
- For determining the overall strength of the neural drive to the muscle and is correlated with both the strength of muscle contraction and its output
- Threshold
- For the detection of muscle activity timing in EMG signals
- Teager-Kaiser
- Measures the amount of energy in an EMG signal
- Area Under The Curve
- For determining the compound motor action potential (CMAP) and other measurements
- Envelope EMG Data
- A classic method of measuring muscle contraction
- Filtering
- User controlled high pass and low pass filters
- Power Spectral Density (FFT)
- Breaks down the signal into high and low-frequency spectral components
- Mean (MNF) and Median (MDF) Frequency
- The most valuable and commonly used frequency-domain features for assessing muscle fatigue in surface EMG signals
- Peak Frequency (PKF)
- Frequency at which the maximum EMG power occurs
- Total Power (TTP)
- Total amount of power used over time
- Mean Power (MNP)
- The average power of EMG power spectrum
- Frequency Ratio (FR)
Differentiate between contraction and relaxation of muscle and it is defined as the ratio of power spectrum at low-frequency band and high-frequency band
EMG
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EMG in Dentistry
In dentistry, uses of EMG is more common in temporomandibular joint (TMJ) disorder, TMJ dysfunction, dystonia, orthodontics, implants, occlusion or bite correction, cranial nerve lesion, and assessing muscles of the head and neck at rest and in function.
Surface EMG can be used to study bioelectrical phenomena of muscular contraction. Surface EMG allows the examination of some important muscles involved in chewing, swallowing, and posture of the head (typically masseter, temporalis anterior and posterior, digastric anterior, sternocleidomastoid).
LabScribe provides an easy-to-use system for computerized experiment design for psychology and neuroscience experiments. In addition to presenting visual and auditory stimuli, physiological parameters can be recorded from iWorx recorders using the same software.
Video Capture
The LS-VIDEO Capture Module for LabScribe Software enables recording video from a webcam or the computer screen, both with or without audio while recording physiological signals from an iWorx recorder. This module makes it easy to add video to any recording. Students can follow along with instructor-lead experiments in real-time and see how data is produced. Researchers can record experiments in real time for publication and presentations.
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