What data does electromyography (EMG) capture?

Electromyography (EMG) captures electrical activity from skeletal muscles, making it a crucial tool in both clinical and research settings. When a muscle is activated, it generates electrical signals that can be detected by electrodes placed on the skin or inserted into the muscle. These signals provide valuable information on muscle function, helping to diagnose conditions such as neuromuscular disorders, muscular dystrophies, and even nerve injuries.

In contrast, the other choices refer to different physiological data that EMG does not measure. For instance, brain waves are captured through electroencephalography (EEG), while blood pressure readings are obtained using sphygmomanometers or other blood pressure measuring devices. Emotional responses, on the other hand, are typically assessed using various psychological or physiological methods such as galvanic skin response or functional MRI, which do not involve measuring muscle activity. Thus, the unique capability of EMG to detect muscle electrical activity sets it apart in the field of neurosensory studies.