Final answer:
The head thrust test is used to evaluate the vestibulo-ocular reflex and is performed by having the patient fixate on an object while their head is quickly turned by an examiner.
Step-by-step explanation:
The head thrust test is a clinical procedure used to evaluate the function of the vestibulo-ocular reflex (VOR), which helps maintain steady vision during head movements. This test involves a healthcare professional performing a sudden head movement while the patient maintains visual fixation on a target. During this test, the patient is asked to focus on an object directly in front of them. Then, the examiner quickly turns the patient's head to one side. If the eyes can maintain focus on the target as the head moves, it suggests that the VOR is functioning properly.
The head thrust test is part of a neurological exam that can indicate issues like vestibular system dysfunction. It is not used to test taste sensitivity, assess shoulder strength, or evaluate head and neck flexibility. Therefore, the correct answer to how you carry out the head thrust test is Option 4: Sudden head movement with visual fixation.