ua nt - p h / 02 05 09 2 v 8 2 4 M ar 2 00 5 Brain as quantum - like computer

We present a contextualist statistical realistic model for quantum-like representations in physics, cognitive science and psychology. We apply this model to describe cognitive experiments to check quantum-like structures of mental processes. The crucial role is played by interference of probabilities for mental observables. Recently one of such experiments based on recognition of images was performed. This experiment confirmed our prediction on quantum-like behaviour of mind. In our approach " quantumness of mind " has no direct relation to the fact that the brain (as any physical body) is composed of quantum particles. We invented a new terminology " quantum-like (QL) mind. " Cognitive QL-behaviour is characterized by nonzero coefficient of interference λ. This coefficient can be found on the basis of statistical data. There is predicted not only cos θ-interference of probabilities, but also hyperbolic cosh θ-interference. This interference was never observed for physical systems, but we could not exclude this possibility for cognitive systems. We propose a model of brain functioning as QL-computer (there is discussed difference between quantum and QL computers).