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A new multiobjective linear programming (MOLP) algorithm is presented. The algorithm uses a variant of Karmarkar's interior-point algorithm known as the affine-scaling primal algorithm. Using this single-objective algorithm, interior search directions are generated and used to provide an approximation to the gradient of the (implicitly known) utility function. The approximation is guided by assessing locally relevant preference information for the various interior directions through interaction with a decision maker (DM). The resulting algorithm is an interactive approach that makes its progress towards the solution through the interior of the constraints polytope. 相似文献
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Latent inhibition (LI) is a robust phenomenon that is demonstrated when a previously inconsequential stimulus is less effective
in a new learning situation than a novel stimulus. Despite LI’s simplicity, there is considerable disagreement as to its theoretical
basis. Attentional theories claim that unattended stimulus preexposures reduce stimulus associability. Alternatively, it has
been asserted that associability is unaffected and that LI is a result of competition/retrieval processes. The present article
reviews a series of visual search studies, some with normal subjects, both undifferentiated and divided into low and high
schizotypals, and others with pathologies that entail dysfunctional attention, such as schizophrenia, Parkinson’s disease,
and anxiety. The visual search conditions were designed to model those of traditional LI experiments, while tapping attentional
processes independently of the learning scores that index LI. A variety of evidence from these and other studies is used to
support the involvement of attentionaland retrieval processes in LI. A model of the mechanism of action of these processes in LI is presented, together with its application
to schizophrenia. 相似文献
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Griffiths O Hayes BK Newell BR 《Journal of experimental psychology. Learning, memory, and cognition》2012,38(3):576-595
Previous research has suggested that when feature inferences have to be made about an instance whose category membership is uncertain, feature-based inductive reasoning is used to the exclusion of category-based induction. These results contrast with the observation that people can and do use category-based induction when category membership is known. The present experiments examined the conditions that drive feature-based and category-based strategies in induction under category uncertainty. Specifically, 2 experiments investigated whether reliance on feature-based inductive strategies is a product of the lack of coherence in the categories used in previous research or is due to the use of a decision-only induction procedure. Experiment 1 found that feature-based reasoning remained the preferred strategy even when categories with relatively high internal coherence were used. Experiment 2 found a shift toward category-based reasoning when participants were trained to classify category members prior to feature induction. Together, these results suggest that an appropriate conceptual representation must be formed through experience with a category before it is likely to be used as a basis for feature induction. 相似文献
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