Learning stochastic reward distributions in a speeded pointing task.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
Anna SeydellDavid C Knill

Abstract

Recent studies have shown that humans effectively take into account task variance caused by intrinsic motor noise when planning fast hand movements. However, previous evidence suggests that humans have greater difficulty accounting for arbitrary forms of stochasticity in their environment, both in economic decision making and sensorimotor tasks. We hypothesized that humans can learn to optimize movement strategies when environmental randomness can be experienced and thus implicitly learned over several trials, especially if it mimics the kinds of randomness for which subjects might have generative models. We tested the hypothesis using a task in which subjects had to rapidly point at a target region partly covered by three stochastic penalty regions introduced as "defenders." At movement completion, each defender jumped to a new position drawn randomly from fixed probability distributions. Subjects earned points when they hit the target, unblocked by a defender, and lost points otherwise. Results indicate that after approximately 600 trials, subjects approached optimal behavior. We further tested whether subjects simply learned a set of stimulus-contingent motor plans or the statistics of defenders' movements by training subjec...Continue Reading

References

Jul 16, 2003·Spatial Vision·Julia TrommershäuserMichael S Landy
Jul 19, 2003·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Julia TrommershäuserMichael S Landy
Sep 18, 2003·Vision Research·David C Knill, Jeffrey A Saunders
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Aug 5, 2005·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Julia TrommershäuserMartin S Banks

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Citations

Mar 5, 2011·Experimental Brain Research·Sascha SerweJulia Trommershäuser
Oct 4, 2011·PLoS Computational Biology·Dagmar SternadHermann Müller
Feb 18, 2014·PloS One·Daiki NasuKoji Kadota
Jul 18, 2014·Annual Review of Neuroscience·Wei Ji Ma, Mehrdad Jazayeri
Jun 22, 2011·Current Opinion in Neurobiology·Gergo Orbán, Daniel M Wolpert
Jul 11, 2008·Trends in Cognitive Sciences·Julia TrommershäuserMichael S Landy
Jan 15, 2014·Cognition·Andreas JarvstadSimon K Rushton
Jan 28, 2017·PloS One·Luigi AcerbiDaniel M Wolpert
Sep 15, 2015·PLoS Computational Biology·Joseph SniderSergei Gepshtein
Jul 19, 2017·Annual Review of Vision Science·Mary M Hayhoe

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