Question

in a field sobriety test, what does the horizontal gaze nystagmus test assess?
ability to follow a moving object
motor attention
balance
reflexes

Explanation:

The horizontal gaze nystagmus test in a field sobriety test is designed to assess the ability to follow a moving object. Nystagmus is an involuntary eye movement. When a person is asked to follow a moving object (like a pen) horizontally, the presence, degree, and characteristics of nystagmus (such as lack of smooth pursuit, distinct nystagmus at maximum deviation, and onset of nystagmus prior to 45 degrees) are observed. These observations can indicate impairment, often due to alcohol or drug use. Motor attention is more related to divided - attention tests in field sobriety (like counting while doing a physical task). Balance is tested in tests like the one - leg stand. Reflexes are a broader category, and while eye movements involve reflexes, the specific focus of the horizontal gaze nystagmus test is on the ability to follow a moving object.

Answer:

ability to follow a moving object