Persistence and Relapse

This is a primary line of research examining variables contributing to making behavior persistent and likely to relapse. In addition, this work explores approaches to reducing persistence and likelihood of relapse as potential approaches to make behavioral treatments more effective. These studies use laboratory models with nonhumans (pigeons, rats, zebrafish) and humans and in clinical research with children diagnosed with Autism Spectrum Disorder.

Conditional Discrimination

  My work on conditional discrimination focused on complex control by multiple features of sample stimuli – often called divided attention. More recent work in this area involves the application of quantitative models of conditional discrimination to categorize errors in performance. The goal is to develop this research into methods clinicians can use to target teaching strategies more effectively.


This research adopts a range of approaches to examine the use of punishment across several species. Some of this work is applied in examining the utility of an aversion-based treatments for dogs in New Zealand to avoid protected bird species. A line of basic research examines approaches to developing non-shock punishers of operant behavior in rats, pigeons, zebrafish, and humans.


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