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We present a classification and theoretical analysis of discrete-trial and free-operant choice procedures in which reinforcement is assigned to one alternative only, or independently to both, is either always available or conditionally available, and is either "held" or not from trial to trial. Momentary-maximizing and (globally) optimal choice sequences(More)
Today’s supercomputers and tomorrow’s desktop machines have tremendous capabilities for the display of three-dimensional information in real time. A great deal of work has been done in the realistic creation and display of bodies of information, yet the navigation and manipulation of these spaces remains frustratingly rigid. Through the use of advanced(More)
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