Reference Points and Omission Bias

Subjects were asked to evaluate the choice of options leading to known outcomes, or to say how they would feel about a chance outcome, in hypothetical decisions. We independently manipulated the value of the status quo and the assignment of the better or worse outcome to an act or an omission. Acts leading to the worse outcome were always considered worse than omissions leading to the worse outcome. This act-omission difference was reduced or reversed for the better outcome. Most experiments showed an overall bias toward omissions (combining better and worse). Little evidence was found for greater omission bias for losses relative to the status quo than for gains. A bias toward maintaining the status quo itself was found, however, independently of omission bias. Most of the results can be explained by norm theory and by loss aversion, but other possible accounts are inconsistent with the results.     

Demystifying social cognition: a Hebbian perspective

For humans and monkeys, understanding the actions of others is central to survival. Here we review the physiological properties of three cortical areas involved in this capacity: the STS, PF and F5. Based on the anatomical connections of these areas, and the Hebbian learning rule, we propose a simple but powerful account of how the monkey brain can learn to understand the actions of others by associating them with self-produced actions, at the same time discriminating its own actions from those of others. As this system appears also to exist in man, this network model can provide a framework for understanding human social perception.     

Validating a new assessment method for deception detection: Introducing a Psychologically Based Credibility Assessment Tool

The current set of studies was designed to test a new credibility assessment tool, the Psychologically Based Credibility Assessment Tool (PBCAT). Participants watched lab-generated videos of true and false alibi statements, provided while under varying degrees of cognitive load. Judges either provided a truth/lie judgment only, or also rated 11 behavioral cues on the PBCAT. When stories were told under cognitive load the effectiveness of cues at discriminating truth/deception was enhanced, with targets under higher load judged more accurately. Results regarding the new assessment tool indicate that it is capable of improving deception detection performance, even with minimally trained, nonexpert observers.     

A multi-modal investigation of the roles of distress tolerance and emotional reactivity in obsessive-compulsive symptoms

Emerging evidence implicates important roles of poor distress tolerance and heightened emotional reactivity in obsessive-compulsive disorder. To date, investigations have relied mostly on self-report measures, and we sought to extend the literature by examining the relationship between OC symptoms and distress tolerance, as well as emotional reactivity, using three laboratory assessments. Nonclinical participants (N=167) viewed emotional films associated with four different negative emotions and also completed mirror tracing and handgrip persistence tasks. Greater obsessions scores were predictive of poorer emotional tolerance for a sad film and shorter persistence on the mirror tracing task. Among men only, obsessions were negatively correlated with persistence on the handgrip task. Associations between increased emotional reactivity and washing symptoms also emerged. These findings provide further evidence for the role of poor distress tolerance in obsessions and suggest heightened emotional reactivity may play a role in compulsive washing.