The CognAc lab explores how people select, plan, and produce movement. We use a variety of cognitive neuroscience methods including behavioral studies in healthy and neurologically impaired populations, TMS, fMRI, EEG, and computational modeling.
Our current work includes studies on action selection and preparation. We are applying ideas from the decision making literature to ask how people select a specific movement to accomplish a desired action goal. For example, how do we decide which hand to use to pick up a cup of coffee, and how contextual factors influence this decision. These behavioral studies are complemented by TMS and fMRI work to investigate the dynamics of preparatory processes in the motor pathways, as well as neuropsychological studies involving patients with Parkinson's disease, cerebellar degeneration, or cortical lesions.
Our current work on skill acquisition has focused on the interaction of explicit and implicit learning mechanisms. In particular, we are interested in how strategies influence motor adaptatoin processes that operate outside of awareness. This work builds on the literature examining the relatioship of the cerebellum, parietal lobe, and prefrontal cortex in motor learning.
As part of our general interest in cognition and action, we have also conducted research in the general area of embodied cognition, looking at the relationship of language, perception, and action.
Available for downloading at the Ivry Lab Web site.
1. Motor Learning
Taylor JA, Klemfuss NM, Ivry RB. (2010). An explicit strategy prevails when the cerebellum fails to compute movement errors. Cerebellum, 9: 580-586. PMID: 20697860
Taylor, J.A. and Ivry, R.B. (2011). Flexible cognitive strategies during motor learning. PLoS Computational Biology, 7:e1001096. PMID: 21390266
Schlerf, J.E., Ivry, R.B., and Diedrichsen, J. (2012). Encoding of sensory prediction errors in the human cerebellum. Journal of Neuroscience, 32: 4913-4922.
2. Response Selection
Duque, J. Lew, D., Mazzocchio, R., Olivier, E., and Ivry, R. (2010). Evidence for two concurrent inhibitory mechanisms during response preparation. Journal of Neuroscience, 30, 3793-3802.
Oliveira, F., Diedrichsen, J., Verstynen, T., Duque, J., and Ivry, R.B. (2010). Transcranial magnetic stimulation of posterior parietal cortex affects decisions of hand choice. Proceedings of the National Academy of Sciences, 107, 17751-17756. PMID: 20876098
Stoloff, R.H., Taylor, J.A., Xu, J., Ridderikhoff, A., and Ivry, R.B. (2011). Effect of reinforcement history on hand choice in an unconstrained reaching task. Frontiers in Decision Neuroscience. 5:41. Doi: 10.3389/fnins.2001.0041 PMID: 21472031
Duque, J., Labruna, L, Verset, S., Olivier, E., and Ivry, R.B. (2012). Dissociating the role of prefrontal and premotor cortices in controlling inhibitory mechanisms during motor preparation. Journal of Neuroscience, 32, 806-816.
Oliveira, F.T.P. and Ivry, R.B. (2008). The representation of action: Insights from bimanual coordination. Current Directions in Psychological Science, 17, 130-135.
Diedrichsen, J., Shadmehr, R., and Ivry, R.B. (2010). The coordination of movement: Optimal feedback control and beyond. Trends in Cognitive Science, 14, 31-39. PMID: 20005767
4. Timing and the Cerebellum
Ivry, R.B. and Schlerf, J.E. (2008). Dedicated and intrinsic models of time perception. Trends in Cognitive Science., 12, 273-280.
Moberget, T., Karns, C.M., Deouell, L.Y., Lindgren, M., Knight, R.T., and Ivry, R.B. (2008). Detecting violations of sensory expectancies following cerebellar degeneration: A mismatch negativity study. Neuropsychologia, 46, 2569-2579.
5. Language, Perception, and Action
Gilbert, A., Regier, T., Kay, P., and Ivry, R.B. (2006). Whorf hypothesis is supported in the right visual field but not the left. Proceedings of the National Academy of Sciences, 103, 489-494.
Ravizza, S.M., McCormick, C.A., Schlerf, J.E., Justus, T., Ivry, R.B., and Fiez, J.A. (2006). Cerebellar damage produces selective deficits in verbal working memory. Brain, 129, 306-320.
Landau, A., Aziz-Zadeh, L., and Ivry, R.B. (2010). The influence of language on perception: Listening to sentences about faces affects the perception of faces. Journal of Neuroscience.30, 15254-15261.
Psychology/Cognitive Science 127: Cognitive Neuroscience (fall 2013)
Psychology 292: Introduction to the Department and Profession (fall 2012, first year Psychology graduate students, only)
Psychology 210a: Readings in Cognitive Neuroscience (fall 2013)