Cognitive exertion affects the appraisal of one's own and other people's pain.

Correctly evaluating others' pain is a crucial prosocial ability. In both clinical and private settings, caregivers assess their other people's pain, sometimes under the effect of poor sleep and high workload and fatigue. However, the effect played by such cognitive strain in the appraisal of others' pain remains unclear. Fifty participants underwent one of two demanding tasks, involving either working memory (Experiment 1: N-Back task) or cognitive interference (Experiment 2: Stroop task). After each task, participants were exposed to painful laser stimulations at three intensity levels (low, medium, high), or video-clips of patients experiencing three intensity levels of pain (low, medium, high). Participants rated the intensity of each pain event on a visual analogue scale. We found that the two tasks influenced rating of both one's own and others' pain, by decreasing the sensitivity to medium and high events. This was observed either when comparing the demanding condition to a control (Stroop), or when modelling linearly the difficulty/performance of each depleting task (N-Back). We provide converging evidence that cognitive exertion affects the subsequent appraisal of one's own and likewise others' pain.

Impact of sleep deprivation on attentional networks: disentangling orienting components.

While it is well accepted that sleep deprivation (SD) negatively affects overall vigilance and performance, research on the extent to which SD affects discrete components of attention has produced inconsistent results. The present study aims at exploring the effects of SD on attentional components and their interactions using the revised attentional network test (ANT-R) which allows to examine the three attentional networks: alerting, orienting and executive control. Additionally, it allows the evaluation of subcomponents of orienting. The ANT-R was administered following two sleep conditions: Baseline (BL) - a regular night of uninterrupted sleep, and SD - 24 h of wakefulness. Our data show that SD selectively affects the three attentional networks. We have found a significant slowing down of executive control and a slight detriment of alerting. As far as orienting is concerned, the disengagement component was affected, while validity effect remained unaffected by SD. Our findings have relevant implications for intervention research, highlighting the importance of targeting specifically disengagement and executive control processes.

Individual differences in working memory efficiency modulate proactive interference after sleep deprivation.

Whether and how sleep loss affects executive functioning are still under debate. In this study, we examined the role of individual differences in determining the levels of working memory (WM) efficiency and proactive interference (PI) after sleep deprivation. Fifty-two participants performed a test battery included a modified Sternberg task and the Jonides' 2-back task under two sleep conditions: baseline (BL, a night of regular sleep), and total sleep deprivation (SD, 24 h of wakefulness). In general, we replicated Tucker and colleagues' (2010) results. However, when we divided the subjects into two groups according to WM efficiency after SD, participants that showed a greater efficiency were more susceptible to PI, while those with lower WM efficiency showed a level of resistance to PI similar to BL. These results indicate that resistance to PI after SD is dependent on WM efficiency, highlighting the importance of individual differences in sleep deprivation studies.