Mark Kiefer

Patients often bring transitional objects (TO) to inpatient units. The authors quantified the frequency of TO possession in an inpatient psychiatric setting and assessed whether TO use is specific to a personality disorder (PD) diagnosis, focusing on borderline PD (BPD). TO possession was assessed using the Transitional Objects Questionnaire, and PD diagnosis was established using standard DSM-IV clinical interviews. Of the 104 female patients assessed, 57.7% showed TO use; 84% of BPD patients, 71% of BPD-trait patients, 65% of patients with PD traits (other than BPD), and 56% of PD patients (other than BPD) displayed TO use, whereas 30.6% of patients without PD showed TO use. Patients with TOs were significantly younger and had significantly longer hospital stays. The specificity and sensitivity for TO use in the BPD group were 0.506 and 0.84, respectively. The authors conclude that TO use is closely related to PD diagnosis, but is not specific to BPD.

Research on unconscious or unaware vision has demonstrated that unconscious processing can be flexibly adapted to the current goals of human agents. The present review focuses on one area of research, masked visual priming. This method uses visual stimuli presented in a temporal sequence to lower the visibility of one of these stimuli. In this way, a stimulus can be masked and even rendered invisible. Despite its invisibility, a masked stimulus if used as a prime can influence a variety of executive functions, such as response activation, semantic processing, or attention shifting. There are also limitations on the processing of masked primes. While masked priming research demonstrates the top-down dependent usage of unconscious vision during task-set execution it also highlights that the set-up of a new task-set depends on conscious vision as its input. This basic distinction captures a major qualitative difference between conscious and unconscious vision.

In a previous study we showed that errors following errors activate a strategic (prefrontal) mechanism. In an error trial (trial n) following an erroneous previous trial (trial n - 1) healthy control subjects were found to have enlarged (more negative) amplitudes of the error related negativity (ERN)/error negativity (Ne), an electrophysiological correlate of response monitoring, in response to a negative feedback signal. Contrary to that, patients with major depressive disorder showed smaller (less negative) ERN/Ne amplitudes. It has been discussed controversially whether errors of choice (e.g., pressing an incorrect response button in an Eriksen flanker task) and errors of commission (e.g., pressing a button when one is not supposed to in a Go/Nogo task) are related to different ERN/Ne mechanisms. In the present study, we examined whether our previous result only holds for errors of choice in an Eriksen flankers task or extends to errors of commission in a Go/Nogo task, as well. Ten patients with DSM-IV major depressive disorder and 10 matched controls participated in a Go/Nogo task with performance feedback which signaled monetary reward. Patients with major depressive disorder again showed a less negative ERN/Ne amplitude in error trials following error trials. This result might reflect impaired response monitoring processes in major depressive disorder resulting from an impaired activation of a central reward pathway and/or a deficit in strategic reasoning.