This study examined visual information processing under a stressor of recurring loud sound among groups divided according to psychometrically identified stress susceptibility. Formal models of task performance were employed to address several issues concerning stress effects on cognitive functioning. Examined were effects on parallel versus serial processing structure, task-wise processing capacity, strategies of allocating processing resources to task components, and curtailment of processing of relevant task elements. Contrary to prediction, stressor presence generated slightly more rather than less evidence of a parallel versus serial processing structure. There was some suggestion of central-task capacity depletion among more susceptible subjects, in line with certain theoretical positions. Evidence of curtailed exhaustive processing of relevant stimulus items was negative. Most notable was the disruption by stress among susceptible subjects of performance-enhancing strategies of deploying processing resources across the different task components (elements of the visual display and within-trial stages of processing). Such effects have received relatively little attention in this research domain; their investigation is shown to be made tractable, however, through the application of selected formal models of information processing.