Friendly fire and the proportion of friends to foes

Losses of inhibitory control may be partly responsible for some friendly fire incidents. The Sustained Attention to Response Task (SART; Robertson, Manly, Andrade, Baddeley, & Yiend, 1997) may provide an appropriate empirical model for this. The current investigation aimed to provide an ecologically valid application of the SART to a small arms simulation and examine the effect of different proportions of enemy to friendly confederates. Seven university students engaged in a small arms simulation where they cleared a building floor using a near-infrared emitter gun, tasked with firing at confederates representing enemies and withholding fire to confederates representing friends. All participants completed three conditions which were differentiated by the proportion of enemies to friends present. As hypothesized, participants failed to withhold responses more often when the proportion of foes was higher, suggesting that a prepotent motor response routine had developed. This effect appeared to be disproportionately more substantial in the high foe condition relative to the others. Participants also subjectively reported higher levels of on-task focus as foe proportions increased, suggesting that they found this more mentally demanding. Future research could examine closer the nature of the performance reductions associated with high proportions of foes, as it appears that this is more complex than a simple linear relationship

The effect of task-relevant and irrelevant anxiety-provoking stimuli on response inhibition

The impact of anxiety-provoking stimuli on the Sustained Attention to Response Task (SART; Robertson, Manly, Andrade, Baddeley, & Yiend, 1997), and response inhibition more generally, is currently unclear. Participants completed four SARTs embedded with picture stimuli of two levels of emotion (negative or neutral) and two levels of task-relevance (predictive or non-predictive of imminent No-Go stimuli). Negative pictures had a small but detectable adverse effect on performance regardless of their task-relevance. Overall, response times and rates of commission errors were more dependent upon the predictive value (relevance) of the pictures than their attention-capturing nature (i.e., negative valence). The findings raise doubt over whether anxiety improves response inhibition, and also lend support to a response strategy perspective of SART performance, as opposed to a mindlessness or mind-wandering explanation

Go-stimuli proportion influences response strategy in a sustained attention to response task

The sustained attention to response task (SART) usefulness as a measure of sustained attention has been questioned. The SART may instead be a better measure of other psychological processes and could prove useful in understanding some real-world behaviours. Thirty participants completed four Go/No-Go response tasks much like the SART, with Go-stimuli proportions of .50, .65, .80 and .95. As Go-stimuli proportion increased, reaction times decreased while both commission errors and self-reported task-related thoughts increased. Performance measures were associated with task-related thoughts but not taskunrelated thoughts. Instead of faster reaction times and increased commission errors being due to absentmindedness or perceptual decoupling from the task, the results suggested participants made use of two competing response strategies, in line with a response strategy or response inhibition perspective of SART performance. Interestingly, performance measures changed in a nonlinear manner, despite the linear Go proportion increase. A threshold may exist where the prepotent motor response becomes more pronounced, leading to the disproportionate increase in response speed and commission errors. This research has implications for researchers looking to employ the SAR

The Configural Properties of Task Stimuli do Influence Vigilance Performance

Sixty-one participants performed a sustained attention task in which they were required to respond to a critical signal requiring feature discrimination. Three separate groups performed the task with different global display configurations. The local feature elements (directional arrow shapes) were dis- played on either a circle, a circle broken apart or a reconnected figure. For two of the groups, the entire display consisted of a clear global shape (circle and reconnected), and for one of the groups, the display had no discernible global element (bro- ken circle) despite the critical signal being the same for all the groups. Analyses of hit rate and A′ scores indicated that the broken circle group had impaired performance compared to the global figure groups. A configural superiority effect was found in which performance was improved by having a global shape property to the entire display. These results provide a behavioural base for further research utilizing measures of cerebral activation, as cerebral activity during vigilance tasks may be dependent on both task difficulty and hierarchical aspects of the display. The configurable or hierarchical aspects of vigilance displays may be critical in understanding sustained attention performance and its hemispheric lateralization

Negative stimuli may improve visuospatial working memory

The impact of negative affect on working memory performance is unclear. Visuospatial and verbal working memory are critical in many settings, but may be impaired during exposure to negative stimuli. In Experiment 1, the impact of task-irrelevant negative picture stimuli on verbal compared to visuospatial working memory performance was investigated. Unexpectedly, visuospatial memory performance was superior for trials containing negative stimuli than trials with neutral stimuli. The impact of negative picture stimuli on visuospatial working memory was further examined in Experiment 2. Performance was again superior for negative stimuli relative to neutral stimuli. While much previous research has reported that negative affect is disruptive of visuospatial working memory, the improved performance found here is consistent with other research particularly where negative or arousing stimuli are thought to increase the pool of available processing resources or effort. Implications for contexts where working memory demands occur alongside distressing stimuli are discussed, as well as future research suggestions

Real-time quantitative performance feedback during strength exercise improves motivation, competitiveness, mood, and performance

Providing quantitative feedback on performance in real-time appears to improve performance in a strength training context. Less is known about the associated effects on psychological variables. Fifteen rugby athletes performed a strength training exercise both with and without objective performance feedback provided in real-time. Feedback increased performance, consistent with previous research. Feedback also led to higher ratings of task competitiveness, state motivation, mood, and workload. These findings provide insight into possible underlying mechanisms responsible for the feedback’s facilitative effects on performance. The findings also suggests that providing this type of feedback may have benefits within other industries, where attempts are frequently made to increase adherence to exercise and rehabilitation programs. This research carries important implications for the design and use of technology within both the sports science and healthcare industry

The effects of a transition between local and global processing on vigilance performance

Sixty participants performed a sustained attention task in which they were required to perform either global or local feature discrimination. Two groups required just one type of discrimination, while the remaining two groups started on one type of discrimination before transitioning to the other type halfway through. A transition resulted in worse performance when compared to no transition. It was also found that the local discrimination group showed improved performance over time compared to the global discrimination group. Functional near-infrared spectroscopy (fNIRS) was used to measure blood oxygenation during the task and was used as an index of cerebral hemodynamic activity. Total oxygenation was found to increasemore in global discrimination tasks. It was also found that the left prefrontal cortex showed little change in nontransition tasks while in transition tasks it followed the same trend as the right prefrontal cortex. Combined with performance data, it suggests that an increased utilization of bilateral resources may in some cases improve performance over time