Sat, 26 Jul 2008 07:45:43 BST CiteULike: nelmor's matching http://www.citeulike.org/user/nelmor/tag/matching CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/nelmor/article/2885175 <i>Nature, Vol. 453, No. 7197., pp. 917-920.</i> Perceptual accuracy and conflicting effects of certainty on risk-taking behaviour Sharoni Shafir Taly Reich Erez Tsur Ido Erev Arnon Lotem doi:10.1038/nature06841 Nature, Vol. 453, No. 7197., pp. 917-920. 2008-06-12T04:36:15-00:00 Nature 0028-0836 453 7197 917 920 Nature Publishing Group bees decision human matching model reward risk uncertainty http://www.citeulike.org/user/nelmor/article/2770526 <i>Neuron, Vol. 58, No. 3. (8 May 2008), pp. 451-463.</i><br /><br />Summary Choosing the most valuable course of action requires knowing the outcomes associated with the available alternatives. The striatum may be important for representing the values of actions. We examined this in monkeys performing an oculomotor choice task. The activity of phasically active neurons (PANs) in the striatum covaried with two classes of information: action-values and chosen-values. Action-value PANs were correlated with value estimates for one of the available actions, and these signals were frequently observed before movement execution. Chosen-value PANs were correlated with the value of the action that had been chosen, and these signals were primarily observed later in the task, immediately before or persistently after movement execution. These populations may serve distinct functions mediated by the striatum: some PANs may participate in choice by encoding the values of the available actions, while other PANs may participate in evaluative updating by encoding the reward value of chosen actions. Value Representations in the Primate Striatum during Matching Behavior Brian Lau Paul Glimcher doi:10.1016/j.neuron.2008.02.021 Neuron, Vol. 58, No. 3. (8 May 2008), pp. 451-463. 2008-05-08T09:40:23-00:00 2008 Neuron 58 3 451 463 decision matching monkeys striatum value http://www.citeulike.org/user/nelmor/article/1532725 <i>J. Neurosci., Vol. 27, No. 31. (1 August 2007), pp. 8178-8180.</i><br /><br />The study of decision making poses new methodological challenges for systems neuroscience. Whereas our traditional approach linked neural activity to external variables that the experimenter directly observed and manipulated, many of the key elements that contribute to decisions are internal to the decider. Variables such as subjective value or subjective probability may be influenced by experimental conditions and manipulations but can neither be directly measured nor precisely controlled. Pioneering work on the neural basis of decision circumvented this difficulty by studying behavior in static conditions, in which knowledge of the average state of these quantities was sufficient. More recently, a new wave of studies has confronted the conundrum of internal decision variables more directly by leveraging quantitative behavioral models. When these behavioral models are successful in predicting a subject's choice, the model's internal variables may serve as proxies for the unobservable decision variables that actually drive behavior. This new methodology has allowed researchers to localize neural subsystems that encode hidden decision variables related to free choice and to study these variables under dynamic conditions. 10.1523/JNEUROSCI.1590-07.2007 Understanding Neural Coding through the Model-Based Analysis of Decision Making Greg Corrado Kenji Doya doi:10.1523/JNEUROSCI.1590-07.2007 J. Neurosci., Vol. 27, No. 31. (1 August 2007), pp. 8178-8180. 2007-08-03T09:38:54-00:00 2007 J. Neurosci. 27 31 8178 8180 decision matching model review