"I began seeing demonic apparitions in my roommate's face, I could see zombies walking through the canteen on campus, I believed there was going be a terrorist attack on the premises."

If not treated early, schizophrenia can put patients "at increased risk for brain volume loss," experts say.

Schizophrenia is entirely treatable with existing antipsychotic medication, used in conjunction with psychological therapy and social support.

The inability to accurately process sound frequencies usually presents in adolescence.