Various aspects of the cognitive model of physics problem solving are discussed in detail including relevant cues, encoding, memory, and input stimuli. The learning process involved in the recognition of familiar and non-familiar sensory stimuli is highlighted. Its four components include selection, acquisition, construction, and integration. The effects of experience, familiarity, cognitive factors, and information processing on problem solving is also discussed. It is concluded that the act of physics problem solving involves many different parts of the human nervous system and it is possible that in the future, the neurochemistry and neurophysics of the brain may explain what actually happens in terms of atoms, molecules, electrons, neurons, and axons in physics problem solving. Contains 12 references. (JRH)