New tutorial paper on joint modeling

In an effort to make joint models more accessible, we recently published a paper that uses JAGS as a way to implement joint models of neural and behavioral measures. In the paper, we discuss some simple models each component, and close with a realistic application to single-trial neural activations in fMRI data.

Check it out!

Tutorial paper

Paper published on the importance of including response time

Our paper on the importance of including response time in constraining models of context effects was just accepted at Decision! Using the Multiattribute Linear Ballistic Accumulator model (MLBA; Trueblood et al., 2014) as a case study, we demonstrated the advantages of including response time, rather than just choice data, when fitting the model to data. Based on parameter recovery using both a likelihood-based (DE-MCMC) and likelihood-free (PDA) method, and fitting both simulated and real perceptual data, we concluded that response time provides an important constraint to models of context effects.

  • *Molloy, M. F., *Galdo, M., Bahg, G., Liu, Q., and Turner, B. M. (in press). What’s in a Response Time?: On the Importance of Response Time Measures in Constraining Models of Context Effects. In press at Decision. *Equal contribution.

Paper published on self-control

Our paper developing a model of trial-to-trial self-control measures was just accepted at Cerebral Cortex! After testing several model variants, we concluded that a model with an active suppression of a tempting, but inferior choice option provided the best fit to choice response time data across subjects (hierarchically). Perhaps more interesting is that the single-trial parameters of this inhibitory process correlated strongly with brain regions commonly associated with cognitive control.

James Palestro completes his masters!

On Wednesday, December 6th, James Palestro became the first student in the MbCN lab to complete his masters thesis. James’ work focuses on a recent debate between fixed and collapsing boundary models, which argue either against or for a temporal component of decision making. He reports an experiment of speeded two-alternative forced choice decisions using a mixture of free response and interrogation paradigms to differentiate the qualitative and quantitative predictions of the two model classes. In the end, his results suggest that some task demands induce a collapsing bound strategy.

Paper Published on Context Effects

When choosing among menu items at a restaurant, ever wonder how you represent and choose among items? We recently published a paper investigating the mechanisms at work during the deliberation process among multi-attribute, multi-alternative choices. To do this, we used Bayesian statistics to fit the extent theories of how this process unfolds, as well as an analysis meant to investigate the plausibility of various model mechanisms by testing each possible configuration. Check it out!