Neutral Task Research Articles

The neutral servant: the Czech EU Council Presidency and its framing by the political parties

ABSTRACT The rotating Presidency of the EU Council has been considered as a neutral and technocratic service that circulates among EU Member States. However, this traditional view is challenged in an era where the EU has become politicized and contested. This article explores whether this neutral technocratic approach still holds by examining the preparatory stage of the Czech EU Council Presidency in 2022. Despite the highly politicized nature of the general Czech EU debate, the Presidency was framed by domestic political parties – including the populist ones – as a neutral task or challenge. The depoliticization of the Presidency can be attributed to its low attractiveness to populist parties, the limited number of participants in the debate, and the prominence of more salient EU-related topics, such as the war in Ukraine.

Central and peripheral physiological responses to decision making in hoarding disorder

Individuals with hoarding disorder (HD) have difficulty parting with personal possessions, which leads to the accumulation of excessive clutter. According to a proposed biphasic neurobiological model, HD is characterized by blunted central and peripheral nervous system activity at rest and during neutral (non-discarding) decisions, and exaggerated activity during decision-making about discarding personal possessions. Here, we compared the error-related negativity (ERN) and psychophysiological responses (skin conductance, heart rate and heart rate variability, and end tidal CO2) during neutral and discarding-related decisions in 26 individuals with HD, 37 control participants with anxiety disorders, and 28 healthy control participants without psychiatric diagnoses. We also compared alpha asymmetry between the HD and control groups during a baseline resting phase. Participants completed a series of Go/No Go decision-making tasks, one involving choosing certain shapes (neutral task) and the other involving choosing images of newspapers to imaginally “discard” (discarding task). While all participants showed expected increased frontal negativity to commission of an error, contrary to hypotheses, there were no group differences in the ERN or any psychophysiological measures. Alpha asymmetry at rest also did not differ between groups. The findings suggest that the ERN and psychophysiological responses may not differ in individuals with HD during simulated discarding decisions relative to control participants, although the null results may be explained by methodological challenges in using Go/No Go tasks as discarding tasks. Future replication and extension of these results will be needed using ecologically valid discarding tasks.

Presentation of multiple task instructional sets impacts auditory Stroop performance during dual task locomotion.

The auditory Stroop is a modification of the classic Stroop paradigm commonly used in dual-task research when the motor task requires the visual system. Despite its use, there are gaps in our understanding of this tool. For example, in visual/auditory Stroop paradigms, neutral cues irrelevant to the required response, which theoretically cause less interference/facilitation, are used to elucidate effects of visual/auditory demands on neural processes. Specifically, in auditory Stroop paradigms the use and choice of neutral cue words is inconsistent. To address these gaps, we instrumented participants with kinematic markers and a digital microphone and asked them to respond to auditory Stroop cues and neutral cue words consisting of either one or two syllables, while simultaneously performing an unobstructed locomotor task. Two blocks of trials were collected. In one block, participants had prior knowledge that either an auditory Stroop or a neutral word stimulus would be presented (Known); a second block presented both types of cognitive cues in a random order to participants (Mixed). We observed main effects of cognitive task (neutral, incongruent, congruent) and instructional set (Known, Mixed) on response times, but not on center of mass velocity. Also, more time was required to verbally respond to an incongruent compared to congruent or neutral task across all conditions, and neutral task words with one syllable resulted in longer response times compared to two syllable neutral words. We recommend that researchers include neutral cues when using the auditory Stroop test and to carefully consider their neutral word choice.

Effects of mindfulness training combined with aerobic exercise in people with methamphetamine use disorder: Evidence from sleep, brain activation, and cravings

ObjectiveTo explore the clinical rehabilitation benefits of mindfulness combined with aerobic calisthenics for people with methamphetamines (MA) use disorder. MethodsIn a randomized controlled trial design, 52 male with MA use disorder were randomly divided into mindfulness combined with aerobic calisthenics group (MACG), aerobic calisthenics group (ACG), and control group (CG). The electroencephalogram, sleep quality, and drug craving in the three groups were measured before and after the 12-week intervention, respectively. Results1) Sleep quality and drug craving of MACG and ACG were significantly improved after intervention, and the former had a better effect. 2) Compared with baseline, Fz-alpha wave energy values of MACG and ACG faced with drug image stimulation (drug task) were significantly increased after intervention (both p < 0.001), while CG was still significantly lower than neutral task (p < 0.05). 3)After intervention, the Fz-alpha (both p < 0.01), F3-alpha (p < 0.01, p < 0.05, respectively), and F4-alpha wave (both p < 0.01) of MACG and ACG in drug tasks were significantly increased and higher than those of CG. 4)Both in drug and neutral tasks, the PSQI score of the three groups after intervention were negatively correlated with prefrontal alpha wave, the PSQI score was significantly positively correlated with drug craving, and the correlation between the two exercise groups was stronger. ConclusionMindfulness combined with aerobics calisthenics was more conducive to improving the sleep quality of people with MA use disorder, and regulating the abnormal activation of prefrontal lobe in the face of drug cue stimulation, and ultimately conducive to the reduction of craving.

Sustaining attention in affective contexts during adolescence: age-related differences and association with elevated symptoms of depression and anxiety

ABSTRACT Sustained attention, a key cognitive skill that improves during childhood and adolescence, tends to be worse in some emotional and behavioural disorders. Sustained attention is typically studied in non-affective task contexts; here, we used a novel task to index performance in affective versus neutral contexts across adolescence (N = 465; ages 11–18). We asked whether: (i) performance would be worse in negative versus neutral task contexts; (ii) performance would improve with age; (iii) affective interference would be greater in younger adolescents; (iv) adolescents at risk for depression and higher in anxiety would show overall worse performance; and (v) would show differential performance in negative contexts. Results indicated that participants performed more poorly in negative contexts and showed age-related performance improvements. Those at risk of depression performed more poorly than those at lower risk. However, there was no difference between groups as a result of affective context. For anxiety there was no difference in performance as a function of severity. However, those with higher anxiety showed less variance in their reaction times to negative stimuli than those with lower anxiety. One interpretation is that moderate levels of emotional arousal associated with anxiety make individuals less susceptible to the distracting effects of negative stimuli.

Nostalgia, Ritual Engagement, and Meaning in Life.

Rituals are pervasive and beneficial. Little is known, however, about causes or antecedents of ritual engagement. We hypothesized that nostalgia-a sentimental longing for one's past-promotes ritual engagement, which in turn augments meaning in life. We tested this hypothesis in five methodologically diverse studies. In Study 1 (N = 311), nostalgia was positively associated with ritual engagement. In Study 2 (N = 188), nostalgia promoted ritual engagement, and in Study 3 (N = 296), it did so over engagement in a neutral task. In Study 4 (N = 252), nostalgia predicted later ritual engagement but not vice versa, convergent with Studies 2 and 3. Furthermore, nostalgia prospectively predicted meaning in life through specific ritualistic behaviors during a traditional festival. Finally, in Study 5 (N = 166), experimentally manipulated ritual engagement augmented meaning in life. As hypothesized, nostalgia advances ritual engagement, contributing to a meaningful life.

Effects of cognitive load and different exercise intensities on perceived effort in sedentary university students: a follow up of the Cubo Fitness Test validation.

Work and intellectually fatiguing environments can significantly influence the health of individuals, which is strictly bound to motor efficiency. In particular, desk workers and university students may have a sedentary lifestyle and a condition of mental fatigue caused by daily routine, which could impair motor efficiency. The assessment is a starting point for enhancing awareness of the individual's psychophysical condition through the perception of one's body motor efficiency, motivating to move towards improvement. This way, a submaximal test based on perceived exertion was developed (Cubo Fitness Test, CFT) and validated in previous studies. Hence, two further studies were employed to enhance the consistency and accuracy of this instrument in different conditions. The first study investigated the internal responsiveness of CFT, evaluating if mental fatigue could affect motor efficiency. The second study investigated which perceived intensity (weak, moderate, strong, or absolute maximum) could be more reliable for applying the CFT (as previous research focused the investigation only on moderate intensity). In the first investigation, participants assessed two stimuli (mental fatigue induced with a Stroop color-word task and a neutral condition based on the vision of a documentary) lasting 60 min each. The quality of psychophysical recovery (total quality recovery) and the mood state (Italian Mood State questionnaire) were evaluated before the stimuli. After the fatiguing or the neutral task, the mood state was newly assessed, together with the evaluation of the workload's characteristics (Nasa TLX) and the CFT motor efficiency. In the second investigation, participants had to perform CFT twice for each at different intensities of Borg's Scale of perceived exertion. Researchers successfully requested to fill out the NASA TLX questionnaire regarding the perceived workload characteristics of CFT, and the reliability of each intensity was assessed. Results seem to enhance the consistency and the accuracy of the instrument. Indeed, findings evidenced that CFT is not influenced by mental fatigue conditions typical of the intellectual work of desk workers and university students for which this test was specifically conceived. Moreover, moderate and strong perceived intensity are the most adequate conditions to assess motor efficiency in these populations.

Examining the influence of self-referential thinking on aberrant salience and jumping to conclusions bias in individuals with schizophrenia-spectrum disorders

Background and objectivesCognitive processes such as aberrant salience and the jumping to conclusions (JTC) bias are implicated in the development of delusions. Self-referential thinking is implicated in this process; however, it is unknown how it may interact with aberrant salience and JTC bias in individuals with schizophrenia-spectrum disorders (SSDs). This study examined associations of self-referential thinking with aberrant salience, JTC bias, and delusion severity, and whether self-referential stimuli led to an increase in aberrant salience and JTC bias in SSDs (n = 20) relative to psychiatrically healthy controls (n = 20). MethodsTo assess aberrant salience and JTC bias, participants were asked to complete both self-referential and neutral versions of the Salience Attribution Test (SAT) and the Beads Task, as well as self-report measures of aberrant salience and JTC bias. ResultsSelf-referential task condition interacted with clinical group to predict JTC beads task scores, such that participants with SSDs exhibited greater levels of JTC bias than psychiatrically healthy controls during the neutral task condition, when controlling for levels of motivation, cognitive insight, and functioning. Self-referential thinking was significantly associated with aberrant salience, JTC bias, and delusion severity. LimitationsThis experiment examined trait-level relationships between variables, so does not provide information about state-level interrelationships and would benefit from replication using more dynamic methods such as ecological momentary assessment. ConclusionsThese findings highlight the interrelationships between self-referential thinking, JTC bias, aberrant salience, and delusion severity, in individuals with SSDs, and support the interactive role of self-referential thinking in predicting JTC bias.

Contextual framing effects on risk aversion assessed using the bomb risk elicitation task

We examine the impact of framing on individuals’ risk-taking behavior in the context of health risks during the coronavirus outbreak. We elicit risk attitudes from a sample of 3385 individuals across seven European countries using an incentivized decision-making task. Participants are randomly assigned to one of three versions of the task: one involving the risk of a bomb explosion, one involving the risk of contracting an infectious disease, and one involving opening an empty box. We find that the framing of the task significantly affects risk-taking behavior, with participants exhibiting greater risk aversion in the health task than in the bomb or neutral task. This framing effect is observed in the majority of the countries studied.

Does a white bear help you eat less? The impact of the inhibitory spillover effect on eating behaviour.

Overweight and obesity are global problems with negative physical, social, and psychological outcomes. Besides other factors, inhibitory control deficits contribute to weight gain and development of overweight. The inhibitory spillover effect (ISE) improves inhibitory control through transfer of inhibitory control capacity from one domain to an unrelated, second domain. For ISE to occur, one inhibitory control task is executed simultaneously with a second, non-control related task thereby increasing inhibitory control in this task. In this preregistered study, we tested the ISE induced through thought suppression in contrast to a neutral task in participants with normal weight and overweight (N=92). A simultaneously conducted bogus taste test served as outcome measure for food intake. We found neither an interaction effect between group affiliation and condition nor an effect of group affiliation. However, contrary to our expectations, we found higher food intake in participants with active ISE compared to the neutral task. This result might indicate rebound effects of applied thought suppression which led to the experience of loss of control and therefore undermined maintenance and function of the ISE. This main result was robust to all moderator variables. We elaborate further factors for the finding, theoretical implications, and future research directions.

A Virtual Character’s Agency Affects Social Responses in Immersive Virtual Reality: A Systematic Review and Meta-Analysis

Social responses to virtual humans in immersive Virtual Reality (VR) may depend on whether users perceive them to be controlled by a person (avatar) or by the computer (agent). As related evidence is growing, this meta-analysis set out to synthesize corresponding findings. Specifically, we analyzed whether the perceived agency of a virtual human affects (1) social presence, (2) the evaluation of the virtual entity, and (3) behaviors toward it differently. Additionally, we controlled for task type, the virtual entity’s appearance, the type of interaction, and agency manipulation. A literature search yielded 20 studies examining 911 participants (agent condition: 460, avatar condition: 451). Differences between perceived avatars and agents in social responses were calculated using Hedges’ g. Results showed differences for social presence (g = 0.65, p = .001) and evaluation (g = 0.30, p = .024) in favor of avatars over agents. No effects emerged for behavioral outcomes. Meta-regressions revealed larger agency-differences in social presence for neutral than for negative tasks, and differences in evaluation for positive compared to mixed and neutral tasks. Overall, our findings suggest that while deliberate social responses like social presence and evaluation depend on perceived agency, automatic behaviors do not. For future research, particularly consistent conceptualizations of key variables are necessitated.

Altruistic behaviour decreases agent's unhealthy food intake: Based on the self-determination theory model of vitality.

This study explored whether altruistic behaviour would decrease agent's unhealthy food intake, and whether vitality and state self-control would sequentially mediate this effect based on the Self-Determination Theory Model of Vitality. It included 1019 college students in total across three studies. Study 1 was a laboratory experiment. By framing a physical task as a helping behaviour or a neutral experimental task, we examined whether these framed tasks impacted participants' subsequent unhealthy food intake levels. Study 2 was an online investigation measuring the relationship between donation (vs. no donation) behaviour and participant's estimated unhealthy food intake level. Study 3 was an online experiment with a mediation test. By random assignment of conducting a donation behaviour versus a neutral task, we examined whether these behaviours affected participants' vitality, state self-control, and estimated unhealthy food intake levels. In addition, we tested a sequential mediation model with vitality and state self-control as the mediators. Both unhealthy and healthy foods were included in Study 2 and 3. Results showed that altruistic behaviour could decrease agent's unhealthy (but not healthy) food intake, and this effect was sequentially mediated by vitality and state self-control. The findings highlight that altruistic acts may buffer agents against unhealthy eating behaviour.

Elucidating behavioral and functional connectivity markers of aberrant threat discrimination in PTSD.

Patients with posttraumatic stress disorder (PTSD) tend to overgeneralize threat to safe stimuli, potentially reflecting aberrant stimuli discrimination. Yet, it is not clear whether threat overgeneralization reflects general discrimination deficits, or rather a specific bias related to aversive stimuli. Here we tested this question and characterized the neural correlates of threat discrimination. One-hundred and eight participants (33 PTSD; 43 trauma-exposed controls; 32 healthy controls) completed an emotionally neutral complex shape discrimination task involving identifying in 42 similar pairs the previously observed shape; and an emotionally aversive discrimination task, involving providing risk ratings for an aversive conditioned stimulus (CS+), and for several stimuli gradually differing in size from the original CS+. Resting state functional connectivity (rsFC) was collected before completing the tasks. No group differences emerged on the emotionally neutral task. Conversely, on the emotionally aversive task, individuals with PTSD had steeper linear risk rating slopes as the stimuli more resembled the conditioned stimulus. Finally, lower rsFC of amygdala-default mode network (DMN) and DMN-salience network (SN) were associated with steeper risk slopes, while for hippocampus-SN, lower rsFC was found only among participants with PTSD. Individuals with PTSD show deficits in discrimination only when presented with aversive stimuli. Dysregulated discrimination pattern may relate to a lack of input from regulatory brain areas (e.g., DMN/hippocampus) to threat-related brain areas (e.g., SN/amygdala).

Eliciting Short-Term Closeness in Couple Relationships With Ecological Momentary Interventions

Relationship closeness is considered an important psychological variable for studying couple relationships, and is often postulated as cause for important relationship outcomes. The current study evaluates four micro-interventions for their suitability to experimentally elicit feelings of closeness towards one’s partner. Using participants’ smartphones, and a combination of experience sampling, event sampling, and ecological momentary interventions, individuals reported for a week on their experiences of closeness before and after completing daily either a neutral task or a task meant to enhance relationship closeness. The closeness tasks included showing physical affection, sharing a childhood memory, looking each other in the eyes for five minutes, and discussing shared life achievements. Results of intention-to-treat analyses on a within-person level showed that closeness increased from pre- to post-measurement on average more strongly on days of any of the four examined closeness conditions than on days of the neutral control conditions. Interindividual variability of this effect was observed, emphasizing the relevance of using within-person designs to evaluate such interventions. Exploratory analyses showed that effect sizes declined across time within the day. This study provides instruments for research on causal effects of closeness in everyday relationship life, and an evidence basis for smartphone-delivered interventions in practitioner settings.

The effect of expressive writing intervention and neutral task writing intervention on positive affect and meaning in life among late middle-aged and older adults

ABSTRACT Background This study examined the effects of different writing interventions on late middle-aged and older adults’ positive affect (PA) and meaning in life (MIL) and explored the mediating role of MIL in the relationship between PA and physical health. Methods A total of 162 participants from China who were over 55 years old participated in this 3 × 3 mixed experimental design. The between-subjects variable constituted the participant group, including the expressive writing intervention (EWI) group, neutral task writing intervention (NTWI) group, and blank control group. The within-subject variable was time, including pre-intervention, post-intervention, and follow-up. PA, MIL, physical health, and perceived benefits were measured at each time point. We used a mixed linear model from SPSS on the entire sample data to examine the effects of writing interventions. To determine the mediation effect, we conducted structural equation model analysis using the “lavaan” package in R. Results MIL showed significant interaction with time and group, but PA showed no significant interaction. Compared with the blank control group, EWI buffered the decline of MIL and had no significant intervention effect on PA. NTWI had no significant intervention effect on MIL and PA. Considering the entire sample, MIL mediated the relationship between PA and physical health. Conclusions This study is the first to demonstrate the effectiveness of EWI on healthy late middle-aged and older adults’ MIL. The mediating effect of MIL facilitated a better understanding of the relationship between PA and physical health.

Is Self-Related Cognition Resistant to Time-Based Expectancy?

Abstract Individuals adapt to their environments by scheduling cognitive processing capacities selectively to the points in time where they are most likely required. This effect is known as time-based expectancy (TBE) and has been demonstrated for several cognitive capacities, like perceptual attention, task set activation, or response preparation. However, it has been argued that self-related cognition (i.e., processing of information linked to oneself) is universally prioritized, compared to non-self-related information in the cognitive system. Consequently, self-related cognition should be resistant to temporal scheduling by TBE, because individuals maintain a constantly high expectancy for self-related cognition, irrespective of its temporal likeliness. We tested this hypothesis in a task-switching paradigm where participants randomly switched between a self-related task and a neutral task. The tasks were preceded by a short or a long warning interval in each trial, and the interval duration predicted probabilistically the task type. We found that participants showed TBE for the neutral task but not for the self-related task. We conclude that the individual cannot benefit from time-based task expectancy when the to-be-expected task is constantly activated, due to its self-related nature.

Effects of affiliation-, achievement-, and power-related topics in mathematical word problems on students' performance, task-related values, and expectancies.

A motivational downturn in mathematics during secondary school has been well documented for many students. As a way to address this, creating personally relevant tasks is supposed to increase students’ motivation for mathematical tasks. According to recent research, topics relating to affiliation, achievement, and power are personally relevant for young people. Prior research showed that motive imagery in school tasks increases students’ task-related intrinsic value and success expectancies. The present study examined the effect of motive topics in word problems on students’ task performance. We contextualized mathematical tasks either with affiliation, achievement, and power topics or with neutral topics not related to motive topics. The tasks were comparable regarding their mean word count, text, and mathematical complexity. In three experimental studies (N1 = 56, N2 = 63, N3 = 62), the students solved four tasks for each motive topic and neutral tasks, respectively. The dependent variables were task performance, intrinsic values, and expectancies of success. Repeated measures analyses of variance with the four-level, within-subjects factor motive imagery revealed positive effects of motive imagery in word problems on students’ task performance. This was particularly true for achievement-related tasks compared with neutral tasks. The results also indicated slightly positive effects for affiliation-related word problems on students’ performance. In addition, the intrinsic value for affiliation-related (Experiment 1) and achievement-related tasks (Experiment 3) was higher than for neutral tasks. Power imagery did not affect students’ task performance; it negatively affected students’ intrinsic value compared with neutral tasks. Task-related success expectancies were not influenced by motive imagery. The present study replicates and extends previous findings that indicate that tasks referring to affiliation and achievement imagery are more appealing to students and can benefit their performance.

615-P: Identification of Barriers to Medication Adherence in People with Type 2 Diabetes Using Qualitative Interviews and the Theoretical Domains Framework

Despite the availability of many effective medications and management options, many people with type 2 diabetes have low adherence to treatments which can lead to adverse health outcomes. We aimed to better understand the challenges related to type 2 diabetes medication adherence through interviews with people with type 2 diabetes with varying degrees of medication adherence. Phone interviews were conducted in English or French, lasted 45 minutes, and followed a semi-structured discussion guide informed by the Theoretical Domains Framework (TDF) . Eligibility criteria included being diagnosed with type 2 diabetes for at least 2 years and current use of diabetes medication (s) . A total of 30 people with type 2 diabetes were interviewed, with representation across Canada, by gender (14F/16M) , years since diagnosis (12.9±7.9) , types of medication and regimen (n=15 on polypharmacy) , and medication adherence levels (n=for each of the low/medium/high adherence groups) . Themes related to medication adherence identified from interviews mapped to 12 of the 14 TDF domains, with the Knowledge and Skills domain being the exceptions. Compared to people with type 2 diabetes categorized to the high adherence group, those categorized to the low adherence group doubted the appropriateness of their medications; reported less access to healthcare providers; tended not to use organizational tools to help with taking medication; and discussed financial barriers to accessing their medications. In contrast to those in the low adherence category, we found that highly adherent people with type 2 diabetes often viewed taking their medication as an emotionally neutral task. To validate these findings, additional quantitative research is underway to help support people with type 2 diabetes to overcome the psychological and tangible barriers to adherence and impact the perception of taking medication as a task without emotional connotations and stigma. Disclosure M. Vallis: Advisory Panel; Bausch Health, Canada, Novo Nordisk Canada Inc. Consultant; Abbott Diabetes, LifeScan. Speaker's Bureau; AbbVie Inc., Bausch Health, Canada, LifeScan, Novo Nordisk, Novo Nordisk A/S. S. Jin: Advisory Panel; Novo Nordisk Canada Inc. Consultant; Abbott Diabetes, Boehringer Ingelheim International GmbH, Dexcom, Inc., HLS Therapeutics Inc., Janssen Pharmaceuticals, Inc., MDBriefcase. Research Support; Novo Nordisk Canada Inc. Speaker's Bureau; Abbott Diabetes, Boehringer Ingelheim International GmbH, Eisai Inc., EOCI Pharmacomm Ltd., Janssen Pharmaceuticals, Inc., Novo Nordisk Canada Inc., Pfizer Inc., Roche Diabetes Care. Other Relationship; Diabetes Canada. A. Klimek-Abercrombie: Employee; Novo Nordisk Canada Inc. G. Ng: Other Relationship; Novo Nordisk Canada Inc. A. Bunko: Other Relationship; Novo Nordisk Canada Inc. A.A. Kukaswadia: Other Relationship; Novo Nordisk. C.S. Neish: Other Relationship; Novo Nordisk Canada Inc.

Can Stimulus Valence Modulate Task-Switching Ability? A Pilot Study on Primary School Children.

Executive functions and emotional processes follow a time-dependent development that reflects the brain’s anatomo-functional maturation. Though the assessment of these cognitive functions is largely examined, in children the role of emotions in the mental set-shifting is still rarely investigated. The aim of this study was to assess how attention shifting can be modulated by the valence of emotional stimuli. To this end, sixty-two primary school children were tested with a new emotional task-switching paradigm obtained by manipulating the emotional valence and physical features of the stimulus pool. Thus, two tasks were alternatively presented: the Valence task and the Color task. Based on executive performance results, we found a lengthening of response times and a lower accuracy in the emotionally connoted task (Valence task), compared to the neutral task (Color task). The data demonstrate that the processing of emotional stimuli modulates the task-switching performance during development. These findings could help in the implementation of teaching strategies that can promote the development of executive functions and, therefore, functionally improve the overall academic performance of children. Finally, a better understanding of the developmental trajectories of executive functions can help neuropsychologists both in the early diagnosis and treatment of potential executive alterations.

Effect of shift work on fatigue, reaction time and accuracy of nurses in the Department of Neurology: A cross-sectional observational study.

The purpose of our study was mainly to explore the effect of different shift work on cognitive and executive performance in a real clinical environment among nurses from China. Working in shifts can disrupt circadian rhythm, resulting in reduced sleep duration, which can have a detrimental effect on cognitive function. To provide continuous service for patient care, shift work is often a special requirement for nurses. The Stroop test can be used to measure selective attention and reaction time during executive function. However, there have been limited studies about the effect of shift work on the cognitive performance of nurses by Stroop tests. Additionally, no study has been conducted in nurses working in shifts from China. Registered nurses in general ward, Department of Neurology, from West China Hospital of Sichuan University, were eligible and consecutively included if they were simultaneously responsible for the day, evening and night shifts on the shift work schedule. A fatigue questionnaire and Stroop tests were performed for each subject separately before and after three working shifts (morning, evening and night shift) to measure changes in fatigue, reaction time and accuracy. Eighteen registered nurses (4 males and 14 females) were included in our study, with a median age of 25 years old. The fatigue degree was significantly increased after day and evening shifts (p = .015 and <.001, respectively). Compared with those in the preshifts, the reaction time in the neutral task and incongruent task was significantly quicker after the day shift (p = .001, p < .001) and night shift (p = .008, .019). In contrast, the reaction time after the evening shift was mildly increased, although without significance. There was no significant difference in accuracy among the three different working shifts. In addition, there was a negative correlation between the fatigue score and reaction time on the incongruent task in the Stroop test before the day shift (r = -.542, p = .020). The fatigue score in the postday shift was found to be inversely related to working hours in the daytime (r = -.500, p = .034). Our study showed that increased fatigue was found in nurses after day and evening shifts, and shift work can affect the reaction time after the evening shift. However, there was no significant difference in accuracy and a high level of attention could be maintained among the three working shifts, suggesting a highly developed sense of responsibility in our nurses. In addition to focusing on the common adverse effects of evening or night shifts on nurses, fatigue in the day shift should be paid special attention to by the leadership in the nursing management. Also, nurse managers can implement specific strategies to reduce fatigue after the day shift by shortening the working hours in the daytime appropriately, setting rest periods in the day shift or dividing nurses into morning and afternoon shifts.