Morton Prince,
The unconscious
(1921)
“ For instance, we can prescribe a conflict between the subconsciousness and the personal consciousness, between a subconscious wish and a conscious wish, or volition, and observe the resultant mental and physical behavior, which may be inhibition of thought, hallucinations, amnesia, motor phenomena, etc. The possibilities and limitations of subconscious influences can in this way be experimentally studied. Subconscious personalities, therefore, afford a valuable means for studying the mechanism of the mind. ”
