Aldous huxley Called Humankind's basic trend toward spiritual growth the "Perennial philosophy." In the view of james austin, the trend implies a "Perennial psychophysiology" -- because awakening, or enlightenment, occur...Aldous huxley Called Humankind's basic trend toward spiritual growth the "Perennial philosophy." In the view of james austin, the trend implies a "Perennial psychophysiology" -- because awakening, or enlightenment, occurs only when the human brain undergoes substantial changes. What are the peak experiences of enlightenment?