The facial nerve also functions as the efferent limb of the corneal reflex. It provides the sensory component of the Golgi tendon reflex. The extensor plantar reflex is usually absent. Dextromethorphan hydrobromide affects the signals in the brain that trigger the cough reflex. Neuroticism is highly correlated with the startle reflex. It is important in the bilateral pupillary light reflex. This indicates an intact direct and consensual pupillary light reflex. It is one of the muscles involved in the acoustic reflex. This is known as the pupillary light reflex. Intentional suppression of the blink reflex could lead to eye injury. Most of his work involved research in temperament, conditioning and involuntary reflex actions. It is a cause of reflex bradycardia. Signs may include delayed relaxation of the ankle reflex and a slow heartbeat. There is also a genetic factor that increases the probability of photic sneeze reflex. This ultimately leads to hyperreflexia, an exaggerated deep tendon reflex.