Dr. Andrew Leber
Associate Professor, Cognitive
203 Psychology Building
1835 Neil Avenue
- B.A.: Rutgers University
- Ph.D.: Johns Hopkins University
Attention and Cognitive Control
To be human is to be an organism dynamically embracing frequent change. Consider a blues musician who can intently play into a harmonica and then quickly transition to singing, possibly while playing the guitar throughout. At other times, he may remain completely silent. What is perhaps more impressive than his capacity to engage in this varied assortment of behaviors is his ability to demonstrate the relevant ones at the appropriate times (e.g., in close calibration with his band mates). Flexibility like this applies not just to overt behaviors, but internal processing as well. Consider that we sometimes deliberately attend to salient information (e.g., watching for cars or bicycles while crossing the street), while at other times we tune out virtually all environmental distractions unrelated to our task – witness the entrancement of video game players who are immune to interference by anything outside of the TV screen.
How do we claim such flexible control of behavior, and what neural and cognitive factors give rise to it? This broad question continually inspires and guides our lab’s work, which is best characterized as the study of cognitive control. Cognitive control can be thought of as a mechanism that selects behavioral strategies (or “task sets”), updates such strategies, and modulates the degree to which these strategies are automatic (i.e., stimulus-driven) or controlled (i.e., effortfully implemented to override reflexive behavior). Research in this domain cuts across the scientific disciplines of attention, decision making, memory, perception, and learning.
My lab’s research on cognitive control has aimed to shed light on the following questions: 1) How do we focus on behaviorally relevant stimuli and ignore irrelevant stimuli? 2) Why do we “choose” to resist irrelevant stimuli in some situations, but not in others? 3) Does our ability to update task sets fluctuate over time, and if so, why? 4) Does our ability to maintain a single task set fluctuate over time, and if so, why? We have approached these questions using a variety of methods, principally behavioral studies and functional MRI.
Irons, J. L. & Leber, A. B. (2016). Choosing attentional control settings in a dynamically changing environment. Attention, Perception & Psychophysics, 78 (7), 2031-2048.
Moser, J. S., Moran, T. P., & Leber, A. B. (2015). Attentional search training improves attentional control and reduces state anxiety in trait anxious college students. Behavior Therapy, 46, 834-843.
Leber, A. B., Lechak, J. R., & Tower-Richard, S. M. (2013). What do fast response times tell us about attentional control? Journal of Vision, 13 (3), 1-12.
Lamy, D., Leber, A. B., & Egeth, H. E. (2012). Selective attention. In I. B. Weiner, A. F. Healy, & R.V. Proctor (Eds.), Handbook of Psychology. Volume 4: Experimental Psychology (2nd ed., pp. 267-294). New York: Wiley.
Leber, A. B. (2010). Neural predictors of within-subject fluctuations in attentional control. Journal of Neuroscience, 30 (34), 11458-11465.
Leber, A. B., Kawahara, J. –I., & Gabari, Y. (2009). Long-term, abstract learning of attentional set. Journal of Experimental Psychology: Human Perception and Performance, 35 (5), 1385-1397.
Leber, A. B., Turk-Browne, N. B., & Chun, M. M. (2008). Neural predictors of moment-to-moment fluctuations in cognitive flexibility. Proceedings of the National Academy of Sciences, USA, 105 (36), 13592-13597.
Leber, A. B. & Egeth, H. E. (2006). It’s under control: Top down search strategies can override attentional capture. Psychonomic Bulletin & Review, 13 (1), 132-138.
Folk, C. L., Leber, A. B., & Egeth, H. E. (2002). Made you blink! Contingent attentional capture produces a spatial blink. Perception & Psychophysics, 64 (5), 741-753.