Publications
Hélie, S., Shamloo, F., & Ell, S. W. (2017). The effect of training methodology on knowledge representation in perceptual categorization. PLoS ONE. DOI: 10.1371/journal.pone.0183904
Ell, S. W., Smith, D. B., Peralta, G., & Hélie, S. (2017). The impact of category structure and training methodology on learning and generalizing within-category representations. Attention, Perception, & Psychophysics, 79, 1777-1794. DOI: 10.3758/s13414-017-1345-2
Hélie, S., Ell, S. W., Filoteo, J. V., & Maddox, W. T. (2015). Neural mechanisms of criterion learning in rule-based categorization: A new model. Brain and Cognition, 95, 19-34. article [pdf]
Smith, J. D., & Ell, S. W. (2015). One giant leap for categorizers: One small step for categorization theory. PLOS ONE. DOI: 10.1371/journal.pone.0137334.
Hélie, S., Ell, S. W., Ashby, F. G. (2014). Learning robust cortical-frontal assocations with the basal ganglia: An integrative review. Cortex. article [pdf]
McCoy, S. K., Hutchinson, S., Hawthorne, L., Cosley, B., & Ell, S. W. (2014) Is pressure stressful? The impact of pressure on the stress response and category learning. Cognitive, Affective, & Behavioral Neuroscience, 14, 769-781. Stress and categorization article [pdf]
Ell, S. W. (2013) Targeted training of rule-guided behavior in Parkinson’s disease. Cognitive, Affective, & Behavioral Neuroscience, 13, 830-846. article [pdf]
Ell, S. W., Ashby, F. G., & Hutchinson, S.. (2012). Unsupervised category learning with integral-dimension stimuli. Quarterly Journal of Experimental Psychology, 65, 1537-1562. article [pdf]
Ell, S. W., & Ashby, F. G. (2012). The impact of category separation on unsupervised categorization. Attention, Perception, & Psychophysics, 74, 466-475. article [pdf]
Ell, S. W., Hélie, S., & Hutchinson, S. (2012). Contributions of the putamen to cognitive function. In A. Costa and E. Villalba (Eds.), Horizons in Neuroscience Research: Vol 7. Nova. article [pdf]
Ell, S. W., Hutchinson, S., & Maddox, W. T. (2012). Explicit and procedural-learning based systems of perceptual category learning. In N. Seel (Ed.), Encyclopedia of the Sciences of Learning. New York: Springer.
Ell, S. W., & Zilioli, M. (2012). Categorical learning. In N. Seel (Ed.), Encyclopedia of the Sciences of Learning. New York: Springer.
Ell, S. W., Cosley, B., McCoy, S. K. (2011). When bad stress goes good: Increased threat reactivity to a psychosocial stressor predicts improved category learning performance. Psychonomic Bulletin & Review, 18, 96-102. article [pdf]
Ell, S. W., Weinstein, A., & Ivry, R. B. (2010). Rule-based categorization deficits in focal basal ganglia lesion and Parkinson’s disease patients. Neuropsychologia, 48, 2947-2986. article [pdf]
Schnyer, D. M., Maddox, W. T., Ell, S. W., Davis, S., Pacheco, J., Verfaellie, M. (2009). Prefrontal contributions to rule-based and information-integration category learning. Neuropsychologia, 47, 2995-3006. article [pdf]
Ell, S. W., Ing, D. A., & Maddox, W. T. (2009). Criterial Noise Effects on Rule-Based Category Learning: The Impact of Delayed Feedback, Attention, Perception, & Psychophysics, 71, 1263-1275. article [pdf]
Ell, S. W., & Ivry, R. B. (2008). Cerebellar pathology does not impair performance on identification or categorization tasks. Journal of the International Neuropsychological Society, 14, 760-770 article [pdf]
Ell, S., W. & Ashby, F. G. (2006). The effect of category overlap on the decision strategy in information-integration and rule-based category learning tasks. Perception & Psychophysics, 68, 1013-1026. article [pdf]
Ell, S. W., Marchant, N. L., & Ivry, R. B. (2006). Focal putamen lesions impair learning in rule-based, but not information-integration categorization tasks.Neuropsychologia, 44, 1737-1751. article [pdf]
Ashby, F. G., Ell, S. W., Valentin, V. V., & Casale, M. B. (2005). FROST: A distributed neurocomputational model of working memory maintenance. Journal of Cognitive Neuroscience, 17, 1728-1743. article [pdf]
Ell, S. W., & Ashby, F. G. (2004). Dynamical trajectories in category learning. Perception & Psychophysics, 66, 1318-1340. article [pdf]
Ashby, F. G., Ell, S. W., & Waldron, E. M. (2003). Procedural learning in perceptual categorization. Memory & Cognition, 31, 1114-1125. article [pdf]
Ashby, F. G., Noble, S., Filoteo, V., Waldron, E., & Ell, S. W. (2003). Category learning deficits in Parkinson’s disease. Neuropsychology, 17, 115-124. article [pdf]
Ashby, F. G., & Ell, S. W. (2002). Single versus multiple systems of category learning: Reply to Nosofsky and Kruschke (2001). Psychonomic Bulletin & Review, 9, 175-180. article [pdf]
Ashby, F. G., & Ell, S. W. (2002). Single versus multiple systems of learning and memory. In J. Wixted (Ed.), Steven’s Handbook of Experimental Psychology: Vol. 4. Methodology (3rd ed.). New York: Wiley. article [pdf]
Ashby, F. G., & Ell, S. W. (2001). The neurobiology of human category learning. Trends in Cognitive Sciences, 5, 181-225. article [pdf]