How is Facial EMG different from EEG?
Electroencephalogram (EEG) testing records and measures the electrical activity of the brain. Typically, an EEG technologist attaches a cap with fixed electrodes on the head; the cap is hooked by wires to a machine that records electric activity on the brain. EEGs are considered to produce excellent records of post-synaptic potentials, especially those generated in the cortex, the cognitive center of the brain. However, they are not as effective in measuring activities in the amygdala, the emotional center of the brain, which is located deep within the median temporal lobes of the brain. Critics note that the meninges, cerebrospinal fluid and the skull “smear” the EEG signal, obscuring its intracranial source and have criticized EEGs as being a measure of arousal instead of emotional response.
