On the Existence of Quantum Wave Function and Quantum Interference   Effects in Mental States: An Experimental Confirmation during Perception and   Cognition in Humans
  We introduce the quantum theoretical formulation to determine a posteriori, if existing, the quantum wave functions and to estimate the quantum interference effects of mental states. Such quantum features are actually found in the case of an experiment involving the perception and the cognition in humans. Also some specific psychological variables are introduced and it is obtained that they characterize in a stringent manner the quantum behaviour of mind during such performed experiment. 
Elio Conte, Andrei Yuri Khrennikov, Orlando Todarello, Antonio   Federici, Joseph P. Zbilut