Electromyography (EMG) is an electrodiagnostic medicine technique for evaluating and recording the electrical activity produced by skeletal muscles. EMG is performed using an instrument called an electromyograph to produce a record called an electromyogram.

EMG results are often necessary to help diagnose or rule out a number of conditions such as: Muscle disorders, such as muscular dystrophy or polymyositis. Diseases affecting the connection between the nerve and the muscle, such as myasthenia gravis.

You may feel some discomfort depending on how strong the impulse is. You should feel no pain once the test is finished. Often, the nerve conduction test is followed by electromyography (EMG). In this test, needles are placed into a muscle and you are told to contract that muscle.

A nerve conduction study is usually done along with electromyography (EMG). The nerve conduction study stimulates specific nerves and records their ability to send the impulse to the muscle. Help diagnose nerve disorders, such as carpal tunnel syndrome or Guillain-Barré syndrome.

A visual evoked potential (VEP) is an evoked potential caused by a visual stimulus, such as an alternating checkerboard pattern on a computer screen. Responses are recorded from electrodes that are placed on the back of your head and are observed as a reading on an electroencephalogram (EEG).

Evoked potential tests measure the time it takes for the brain to respond to sensory stimulation either through sight, sound, or touch. Doctors use the test to help diagnose multiple sclerosis (MS) and other conditions that can cause a person’s reactions to slow. The test can detect unusual responses to stimulation.

Somatosensory Evoked Potential (SSEP) is a test showing the electrical signals of sensation going from the body to the brain. The signals show whether the nerves that connect to the spinal cord are able to send and receive sensory information like pain, temperature, and touch.

A method for evaluating hearing using clicking sounds and recording the responses (known as auditory evoked potentials) with EEG electrodes placed on the scalp; BAER is an objective means of diagnosing and localising early lesions of the auditory system.