Andrew MarshallAndrew T. Marshall

Advisor: Dr. Kimberly Kirkpatrick

Description of Research

John Gibbon once said, "timing is everything." Over the past 100 years, timing behavior has been at the core of extensive research on learning, conditioning, and choice. With the goal of gaining a better understanding of timing from multiple levels, my research interests regard the temporal components of behavior, how time and behavior interact in a variety of reinforcement schedules, and how interval timing impacts other behaviors. My undergraduate work at Brown University concerned the effects of an additional stimulus (a time marker) on response rate and response pattern, as well as the multiple-interval-timing process referred to as simultaneous temporal processing. My graduate interests concern choice behavior in probability and delay discounting, focusing currently on the effects of global and local factors on choice behavior and the mathematical modeling of such behavior.

Publications

MacInnis, M. L. M., Marshall, A. T., Freestone, D. M., & Church, R. M. (2010). A simultaneous temporal processing account of response rate. Behavioural Processes, 84, 506-510.

Galtress, T., Marshall, A. T., & Kirkpatrick, K. (2012). Motivation and timing: clues for modeling the reward system, Behavioural Processes, 90, 142-153.

Marshall, A. T., & Kirkpatrick, K. (2013). The effects of the previous outcome on probabilistic choice in rats. Journal of Experimental Psychology: Animal Behavior Processes, 39, 24-38. doi: 10.1037/a0030765

Brooks, D. I., Ng, K. H., Buss, E. W., Marshall, A. T., Freeman, J. H., & Wasserman, E. A. (2013). Categorization of photographic images by rats using shape-based image dimensions. Journal of Experimental Psychology: Animal Behavior Processes, 39, 85-92. doi: 10.1037/a0030404.

Kirkpatrick, K., Marshall, A. T., Clarke, J., & Cain, M. E. (in press). Environmental rearing effects on impulsivity and reward sensitivity. Behavioral Neuroscience. doi: 10.1037/a0034124

Presentations

Marshall, A. T., MacInnis, M. L. M., Church, R. M. (May 2009). Precise time cues lead to low response rates in rats.Poster presented at the 32nd Annual Conference of the Society for the Quantitative Analyses of Behavior (SQAB). Phoenix, AZ.

Marshall, A., Clarke, J., Crumer, A., Cain, M. E., & Kirkpatrick K. (March 2011). Differential rearing environment effects on impulsive action and impulsive choice in rats. Poster presented at the 18th Annual International Conference on Comparative Cognition (CO3). Melbourne, FL.

Marshall, A., MacInnis, M. L. M., Freestone, D., & Church, R. M. (May 2011). The effects of stimulus probability and position on simultaneous temporal processing. Poster presented at the 34th Annual Conference of the Society for the Quantitative Analyses of Behavior (SQAB). Denver, CO.

Marshall, A. & Kirkpatrick, K. (November 2011). Probabilistic choice in rats. Paper presented at the Fall Meeting of the Comparative Cognition Society. Seattle, WA.

Marshall, A. & Kirkpatrick, K. (April 2012). Previous outcome effects on sequential probabilistic choice behavior. Paper presented at the Oklahoma Kansas Judgment Decision Making (OKJDM) Conference. Manhattan, KS.

Marshall, A. T., & Kirkpatrick, K. (May 2012). Modeling sequential choices in a risky choice task. Poster presented at the 35th Annual Conference of the Society for the Quantitative Analyses of Behavior (SQAB). Seattle, WA.

Marshall, A. T., & Kirkpatrick, K. (May 2012). Analysis of interval timing in two discounting procedures. Invited symposium presented at the 38th Annual Convention of the Association for Behavior Analysis International (ABAI). Seattle, WA.

Marshall, A. T. & Kirkpatrick, K. (October 2012). Reward magnitude effects on sequential risky choices in rats. Paper presented at the Fall Meeting of the Comparative Cognition Society. New Orleans, LA.

Hyder, J., Marshall, A. T., & Kirkpatrick, K. (May 2013). The effects of relative gains and losses on probabilistic choice in rats. Poster presented at the 36th Annual Conference of the Society for the Quantitative Analyses of Behavior (SQAB). Minneapolis, MN.

Marshall, A. T., Galtress, T., & Kirkpatrick, K. (May 2013). Impulsive choice mechanisms: a reductionist approach. Poster presented at the 36th Annual Conference of the Society for the Quantitative Analyses of Behavior (SQAB). Minneapolis, MN 

Teaching Experience

Undergraduate Teaching Assistant

Elementary Psychology: An Introduction to Mind and Behavior
Brown University - Fall 2008

Undergraduate Teaching Assistant

Experimental Analysis of Animal Behavior and Cognition
Brown University - Fall 2009

Education

B.S. with Honors - Psychology - Brown University, 2010

M. S. – Psychology – Kansas State University, 2013

E-mail: atmarsh@k-state.edu