Performance of a complex N-back Task under the threat of aversive robert w bailey human performance engineering pdf was examined. Threat of aversive sounds had no impact on cognitive performance, suggesting coping mechanisms. Coping between threat and high cognitive load may necessitate greater prefrontal oxygenation. Coping between threat and high cognitive load induced lower phasic pupil response.
Coping between threat and high cognitive load induced increased heart rate. In our anxiogenic and stressful world, the maintenance of an optimal cognitive performance is a constant challenge. These models predict that stress can reduce human cognitive efficiency, even in the absence of a visible impact on the task performance. Performance may be protected under stress thanks to compensatory effort, but only at the expense of a cognitive cost. Yet, the psychophysiological cost of this regulation remains unclear. We designed two experiments involving pupil diameter, cardiovascular and prefrontal oxygenation measurements. Importantly, the condition of stress did not impact the performance, but at the expense of a psychophysiological cost as demonstrated by lower phasic pupil response, and greater heart rate and prefrontal activity.
Overall, findings confirmed the psychophysiological cost of both mental effort and stress. Check if you have access through your login credentials or your institution. Please forward this error screen to 198. A complex system is thereby characterised by its inter-dependencies, whereas a complicated system is characterised by its layers. However, “a characterization of what is complex is possible”. Ultimately Johnson adopts the definition of “complexity science” as “the study of the phenomena which emerge from a collection of interacting objects”.