Which of the following phenomena is shown in the figure below? 
Definitions:
Brainstem
The brainstem is the structure located at the base of the brain that connects the cerebrum with the spinal cord, and is responsible for controlling vital life functions such as breathing, heart rate, and blood pressure.
Optic Nerve
The cranial nerve that transmits visual information from the retina to the brain.
Facial Nerve
The seventh cranial nerve that controls the muscles of facial expression, taste sensation on two-thirds of the tongue, and the production of saliva and tears.
Trigeminal Nerve
A cranial nerve responsible for sensory information from the face and motor functions such as biting and chewing.
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