State anxiety reduces working memory capacity but does not impact filtering cost for neutral distracters.

Current theories propose that anxiety adversely impacts working memory (WM) by restricting WM capacity and interfering with efficient filtering of task-irrelevant information. The current study investigated the effect of shock-induced state anxiety on WM capacity and the ability to filter task-irrelevant neutral stimuli. We measured the contralateral delay activity (CDA), an event-related potential that indexes the number of items maintained in WM, while participants completed a lateralized change detection task. The task included low and high WM loads, as well as a low load plus distracter condition. This design was used to assess WM capacity for low and high loads and investigate an individual's ability to filter neutral task-irrelevant stimuli. Participants completed the task under two conditions, threat of shock and safe. We observed a reduced CDA in the threat compared to the safe condition that was specific for high memory load. However, we did not find any differences in CDA filtering cost between threat and safe conditions. In addition, we did not find any differences in behavioral performance between the threat and safe conditions. These findings suggest that being in an anxious state reduces the neural representation for large amounts of information in WM, but have little effect on the filtering of neutral distracters.

The Combat Experience Log: a web-based system for the in theater assessment of war zone stress.

This article presents preliminary data on the Combat Experience Log (CEL)--a web-based prospective data collection system for the in theater assessment of war zone stressors and stress reactions. 177 U.S. Army soldiers deployed to Iraq took part in the study. The overall response rate was 90.1% and the majority of CEL responders perceived the CEL system to be quite easy and convenient to use, and relevant to their war-zone experiences. Preliminary data on stress reactions, CEL utilization and soldier satisfaction are encouraging and suggest that the CEL assessment system offers a potentially useful assessment tool for enhancing our understanding of war-zone stress experiences and their contribution to PTSD and other combat stress disorders.