Nelson, Matthew J. and Boucher, Leanne and Logan, Gordon D. and Palmeri, Thomas J. and Schall, Jeffrey D. (2010) Nonindependent and nonstationary response times in stopping and stepping saccade tasks. Attention Perception and Psychophysics, 72 (7). pp. 1913-1929. ISSN 1943-3921 http://resolver.caltech.edu/CaltechAUTHORS:20110104-152638149
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Saccade stop signal and target step tasks are used to investigate the mechanisms of cognitive control. Performance of these tasks can be explained as the outcome of a race between stochastic go and stop processes. The race model analyses assume that response times (RTs) measured throughout an experimental session are independent samples from stationary stochastic processes. This article demonstrates that RTs are neither independent nor stationary for humans and monkeys performing saccade stopping and target-step tasks. We investigate the consequences that this has on analyses of these data. Nonindependent and nonstationary RTs artificially flatten inhibition functions and account for some of the systematic differences in RTs following different types of trials. However, nonindependent and nonstationary RTs do not bias the estimation of the stop signal RT. These results demonstrate the robustness of the race model to some aspects of nonindependence and nonstationarity and point to useful extensions of the model.
|Additional Information:||© 2010 The Psychonomic Society, Inc. Manuscript received October 30, 2009; revision accepted for publication May 4, 2010. This work was supported by Grants NIH R01-MH55806, NIH R01- EY08890, NIH F32-EY016679, AFOSR FA 9550-07-1-0192, NSF SBE-0542013, NIH P30-EY08126, and NIH P30-HD015052; by Grant SBE-0542013 from the Temporal Dynamics of Learning Center; by an NSF Science of Learning Center grant; and by Robin and Richard Patton through the E. Bronson Ingram Chair of Neuroscience. We thank Doug Hanes, Veit Stuphorn, Alex Gotler, Adi Murthy, and Kirk Thompson for their efforts in the original data collection; Corrie Camalier and Erik Emeric for assistance working with the data sets as well as for the original data collection; Courtney Segovis for assistance with the manuscript; and Pierre Pouget and Richard Heitz for helpful discussions.|
|Official Citation:||Nelson, M. J., L. Boucher, et al. (2010). "Nonindependent and nonstationary response times in stopping and stepping saccade tasks." Attention, Perception, & Psychophysics 72(7): 1913-1929.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||26 Jan 2011 18:06|
|Last Modified:||26 Dec 2012 12:48|
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