Todd Maddox

Brian Glass 3rd Year Graduate Student  Department of Psychology

Research Interests My interests include the study of the motivation learning interface. Specifically, I look at the role of regulatory focus on set shifting tasks that require cognitive flexibility and signal detection tasks that require shifts in response bias and perceptual sensitivity. I am also examining the role of motivation in human foraging. Foraging is the way people search their environment for resources and information. By developing models that can drive simulated opponents, single participants perform foraging tasks in controlled environments. These models are used in combination with a two-dimensional foraging task (see Goldstone and Ashpole 2005) to examine individual level behavior such as the tradeoff between exploration and exploitation. Another line of research is in perceptual classification, such as the role of feedback, intradimensional shifts and extradimensional shifts in category learning. Multiple systems have been implicated in human category learning, and model based analyses help to determine strategies that people may adopt in different types of tasks. Experiment downloads Publications Maddox, W. T., Glass, B. D., O'Brien, J. B., Filoteo, J. V., Ashby, F. G. (In Press) Category label and response location shifts in category learning. Psychological Research. Maddox, W.T., Glass, B.D., Wolosin, S.M., Savarie, Z. R., Bowen, C., Matthews, M.D., Schnyer, D.M. (In Press). The effects of sleep deprivation on information-integration categorization performance. Sleep. [ abstract ] Glass, B.D., Maddox, W.T., Markman, A.B., & Schnyer, D.M. (2009). Exploration and exploitation in a foraging resource acquisition task: Implications from sleep deprivation. Military Psychology, 21(Supp 1), 46-54. Maddox, W.T., Love, B.C., Glass, B.D., Filoteo, J.V.  (2008). When More is Less:  Feedback Effects in Perceptual Category Learning. Cognition 108(2), 578-589. Maddox, W. T, Filoteo, J. V., & Glass, B. D. (under review). Intra- and Extra-Dimensional Shifts in Rule-Based Perceptual Category Learning. Glass, B.D., Vohs, K.D., Markman, A.B., Maddox, W.T. (under review). Ego Depletion Is Not Just Physical Fatigue: Evidence from a 24-Hour Total Sleep Deprivation Experiment. Glass, B.D., Maddox, W.T., Markman, A.B.  (under review). Regulatory Fit Effects on Stimulus Identification. [ abstract ] Glass, B.D., Markman, A.B., Maddox, W.T. (under review) The generalized Exploration Model (GEM):  An Interactive Model of Human Foraging. Maddox, W.T., Filoteo, J.V., Glass, B.D., & Markman, A.B. (under review). Regulatory Fit Effects on a Modified Wisconsin Card Sort Task Glass, B.D., Maddox, W.T., Markman, A.B., Schnyer, D.M. (in preparation). The Effects of Sleep Deprivation on the Exploration-Exploitation Tradeoff. Presentations Glass, B.D., Modeling Human Foraging. Talk presented at University of Texas Cognition and Perception Area Seminar. December 7, 2007. Austin, TX. Glass, B.D., Regulatory Fit and Cognitive Assessment. Talk presented at University of Texas Cognition and Perception Area Seminar. October 24, 2008. Austin, TX. Glass, B.D., Maddox, W.T., Markman, A.B., & Schnyer, D.M. The Effects of Sleep Deprivation on the Exploration-Exploitation Tradeoff. Poster presented at the 15th Annual Cognitive Neuroscience Society Convention, San Francisco, CA, April, 2008. Glass, B.D., Williams, V., Trujillo, L.T., Zeithamova, D., Wolosin, S.M., Worthy, D.A., Maddox, W.T., Markman, A.B., & Schnyer, D.M. A Multifaceted Investigation of the Cognitive Consequences of Sleep Deprivation. Poster presented at the 38th annual meeting of the Society for Nueroscience, Washington, DC, November, 2008. Glass, B.D., Filoteo, J.V., Markman, A.B., & Maddox, W.T. (2009) Regulatory Focus and Executive Functions. Poster Presented at the Annual Meeting of the Cognitive Neuroscience Society, San Francisco, CA, March 22, 2009.