To monitor what is going on Dr Rizzo's colleague Galen Buckwalter tracks physiological markers of stress, such as the reactions of participants' pupils to what their eyes are seeing, their electrocardiograms and their galvanic skin responses.

里兹的同事伽林·布克沃特博士负责对士兵压力状态下的生理指标进行跟踪监测。其中包括受试者观看图像时的瞳孔反应，心电图特征以及体表电流状况。