The brain mechanisms involved in reward-related and other decision–making in the brain are described. The attractor network mechanism described has randomness or noise that makes the decision-making probabilistic. The same stochastic dynamics model provides a unifying account too of long-term and short–term memory. Many advantages of this probabilistic mechanism of decision-making and memory operation are described, as are disorders of such systems including neuropsychiatric disorders such as schizophrenia and obsessive–compulsive disorder.
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