Answer:
1. For independent variables, the facial nerve, vagus nerve, glossopharyngeal nerve, olfactory nerve, and optic nerve are controlled.
2. Hypotheses:
i. If the facial nerve is working, then facial expressions can be correctly interpreted.
ii. If the vagus nerve is working, then visceral reactions will be normal.
iii. If the glossopharyngeal nerve is working, throat sensations will be normal.
iv. If the olfactory nerve is working, then smell will be normal.
v. If the optic nerve is working, then vision will be normal.