Be the first to like this
Facial behavior may provide a measure of the mental state of an individual. Surface EMG is an objective method that is able to reveal non-visible changes in facial muscle tone. However, cross-talk may hamper the interpretation of EMG records. The aim of this study is to reduce cross-talk between facial muscles with a minimum number of concomitant drawbacks. Two electrode parameters were examined: shape of the electrode contacts and bipolar spacing. The EMG of twenty subjects was bilaterally recorded from 8 sites while they viewed 48 pictures, which were presented in series. Although the parameters do affect the amplitude of the myoelectric signal, no consistent results were found that point to an increase in selectivity of the EMG signal as measured by the Selective Value (SV). However, it may be argued that the SV by itself is not a reliable measure for selectivity.