Executive Demands Research Articles

Differences in Selective Attention and Inhibitory Control in Patients with Major Depressive Disorder and Healthy Controls Who Do Not Engage in Sufficient Physical Activity.

Patients with major depressive disorder (MDD) are characterized by neurocognitive impairments and show deficits in various cognitive performance indicators, including executive function. We examined whether sustained attention and inhibitory control differ between patients with MDD and healthy controls, and whether differences exist between patients with mild, moderate, and severe depression. Clinical in-patients (N = 212) aged 18-65 years with a current diagnosis of MDD and 128 healthy controls were recruited. Depression severity was assessed using the Beck Depression Inventory, and sustained attention and inhibitory control were assessed using the oddball and flanker tasks. The use of these tasks promises insights into executive function in depressive patients that are not biased by verbal skills. Group differences were tested via analyses of covariance. Patients with MDD showed slower reaction times in both the oddball and flanker task, independent of the executive demands of the trial types. Younger participants achieved shorter reaction times in both inhibitory control tasks. After correcting for age, education, smoking, BMI, and nationality, only differences in reaction times in the oddball task were statistically significant. In contrast, reaction times were not sensitive to the symptom severity of depression. Our results corroborate deficits in basic information processing and specific impairments in higher-order cognitive processes in MDD patients. As difficulties in executive function underlie problems in planning, initiating, and completing goal-directed activities, they may jeopardize in-patient treatment and contribute to the recurrent nature of depression.

Knowledge Management and the Informal Sector: a Qualitative Review

The exploration of knowledge management and its influence on the informal sector has become a topical interest to industries and academia. Nonetheless, the current deficiency in literature to reveal empirical association between knowledge management and the informal sector is a critical gap this study sought to reduce. Hence, this study specifically examines the interrelationship between knowledge management and the informal sector. The study employed a qualitative descriptive method in analyzing relevant related studies and was anchored on the absorptive capacity theory. The study concludes that the analysis of knowledge management revealed its growing significance at a rapid trajectory that transcends the informal sector; the increasing need and demand for strategic activation, engagement, and execution of knowledge management activities have become much pronounced and invaluable to the sustainable posterity of the affairs of the informal sector. The study also made postulation on the prospect of the association between knowledge management and the informal sector

Modulation of the executive control network by anodal tDCS over the left dorsolateral prefrontal cortex improves task shielding in dual tasking

Task shielding is an important executive control demand in dual-task performance enabling the segregation of stimulus–response translation processes in each task to minimize between-task interference. Although neuroimaging studies have shown activity in left dorsolateral prefrontal cortex (dlPFC) during various multitasking performances, the specific role of dlPFC in task shielding, and whether non-invasive brain stimulation (NIBS) may facilitate task shielding remains unclear. We therefore applied a single-blind, crossover sham-controlled design in which 34 participants performed a dual-task experiment with either anodal transcranial direct current stimulation (atDCS, 1 mA, 20 min) or sham tDCS (1 mA, 30 s) over left dlPFC. Task shielding was assessed by the backward-crosstalk effect, indicating the extent of between-task interference in dual tasks. Between-task interference was largest at high temporal overlap between tasks, i.e., at short stimulus onset asynchrony (SOA). Most importantly, in these conditions of highest multitasking demands, atDCS compared to sham stimulation significantly reduced between-task interference in error rates. These findings extend previous neuroimaging evidence and support modulation of successful task shielding through a conventional tDCS setup with anodal electrode over the left dlPFC. Moreover, our results demonstrate that NIBS can improve shielding of the prioritized task processing, especially in conditions of highest vulnerability to between-task interference.

Contribution of the stereoscopic representation of motion-in-depth during visually guided feedback control.

Considerable studies have focused on the neural basis of visually guided tracking movement in the frontoparallel plane, whereas the neural process in real-world circumstances regarding the influence of binocular disparity and motion-in-depth (MID) perception is less understood. Although the role of stereoscopic versus monoscopic MID information has been extensively described for visual processing, its influence on top-down regulation for motor execution has not received much attention. Here, we orthogonally varied the visual representation (stereoscopic versus monoscopic) and motion direction (depth motion versus bias depth motion versus frontoparallel motion) during visually guided tracking movements, with simultaneous functional near-infrared spectroscopy recordings. Results show that the stereoscopic representation of MID could lead to more accurate movements, which was supported by specific neural activity pattern. More importantly, we extend prior evidence about the role of frontoparietal network in brain-behavior relationship, showing that occipital area, more specifically, visual area V2/V3 was also robustly involved in the association. Furthermore, by using the stereoscopic representation of MID, it is plausible to detect robust brain-behavior relationship even with small sample size at low executive task demand. Taken together, these findings highlight the importance of the stereoscopic representation of MID for investigating neural correlates of visually guided feedback control.

Avaliação da viabilidade técnica para revitalização de rios urbanos: estudo de caso de Arroio Dilúvio em Porto Alegre/RS – Brasil

ABSTRACT The degradation of urban rivers is a phenomenon caused by virtually all cities intersected by rivers. Currently, there is a substantial number of revitalization projects in progress. Nonetheless, their execution demands significant investments, particularly for water quality enhancement. Moreover, apart from the cost factor, the scarcity of space along their banks constrains the implementation of improvement systems. This study introduces a simplified methodology aimed at evaluating the technical feasibility of revitalization interventions within urban river segments, with a focus on enhancing water quality and user experience. The method follows a structured framework encompassing four sequential phases: execution of hydraulic, hydrological, and sanitary analyses concerning the watershed; development of foundational principles and intervention strategies pertaining to the riverbed; appraisal of the congruence between proposed interventions and the intrinsic attributes of the river channel; comprehensive assessment of the overall viability of the revitalization initiative. The method's validation was conducted through a case study involving the Dilúvio Stream in Porto Alegre, RS, showcasing its coherent application and adaptability within the predetermined premises. Thus, the methodology emerges as a preliminary decision-making support tool for projects related to the urban river requalification domain, facilitating the identification of met prerequisites and provision of informed guidance.

Do emotionally salient cues improve prospective memory performance in children and adolescents with autism?

BackgroundProspective memory (PM) describes the ability to initiate and perform a planned action after a delay. Previous studies suggest reduced PM in autism spectrum disorder (ASD); especially when tasks put high demands on executive control resources. Increasing cue salience by presenting emotional cues improves PM performance in non-autistic populations. AimsTo explore whether children with ASD, whose processing of emotionally connoted information might differ from that of typically developing children, may also benefit from this type of salience in PM tasks. Methods and proceduresTwenty-five children with and 25 children without ASD completed a 1-back ongoing task into which an event-based PM task was embedded. Emotional salience of PM cues was varied. Outcomes and resultsChildren with ASD performed as well as children without ASD on the PM task and equally benefited from emotionally salient cues. Specifically, negative cues increased PM performance compared to neutral cues in both groups Conclusions and implicationsThe findings are consistent with the multiprocess framework which postulates that salient PM cues increase performance by promoting automatic intention retrieval and reducing executive control demands. Children with ASD seem to show similar comprehension and accessibility to emotional cues as typically developing children.

Intact memory storage but impaired retrieval in visual memory in autism: New insights from an electrophysiological study.

In a recent study on visual episodic memory (Desaunay, Clochon, et al., 2020), we have shown event-related potentials (ERPs) differences associated with priming (150-300 msec), familiarity (350-470 msec), and recollection (600-700 msec), in young people with autism spectrum disorders (ASD) compared with typical development (TD). To go further into the study of the processes of storage and retrieval of the memory trace, we re-analyzed Desaunay, Clochon, et al's data using time-frequency analysis, that is, event-related synchronization and desynchronization (ERS/ERD). This allows a decomposition of the spectral power within frequency bands associated with these ERPs. We focused both on the same time windows and the same regions of interest as previously published. We mainly identified, in ASD compared with TD, reduced ERS in low-frequencies (delta, theta) in early time-windows, and non-significant differences in ERD in higher frequencies (alpha, beta1) in all time-windows. Reduced ERS during recognition confirmed previously reported diminution of priming effects and difficulties in manipulation and retrieval of both semantic and episodic information. Conversely, preserved ERD corroborates a preservation of memory storage processes. These observations are consistent with a cognitive model of memory in ASD, that suggests difficulties in cognitive operations or executive demand at retrieval, subsequent to successful long-term storage of information. LAY SUMMARY: We assessed the EEG synchronization and desynchronization, during visual episodic recognition. We observed, in youth with Autism, reduced synchronization in low-frequencies (delta, theta), suggesting reduced access to and manipulation of long-term stored information. By contrast, non-significant differences in desynchronization at higher frequencies (alpha, beta frequency bands), that support long-term stored semantic and episodic information, suggested preserved memory traces.

International environmental complexity and the demand for generalists and specialists in executive selection

AbstractResearch SummaryThis study investigates the selection of generalists and specialists as an organizational response to the complexity of firms' international operations. Drawing on the concept of executive job demands, we identify institutional ambiguity and economic sophistication as two distinct sources of country environmental complexity resulting from a firm's foreign investment and predict how they affect the selection of new executives at multinational firms. Our hypotheses associate institutional ambiguity and economic sophistication with the appointment of executives with generalist and specialist backgrounds, respectively. We also examine how the two sources of environmental complexity interact and test multiple alternative specifications to enhance our understanding of environmental complexity as a determinant of executive job demands in the context of international business. Our empirical analyses are performed on a sample of 436 executive appointments occurring in 132 UK‐based manufacturing firms, observed between 2008 and 2018. Findings show general support for our main hypotheses. We discuss the theoretical and practical implications of our findings as well as directions for future research.Managerial SummaryThis study suggests that companies operating across different international environments through their subsidiary operations will be exposed to distinct demands that vary according to the type of environmental complexity. Our results reveal that companies tend to appoint top managers with specialist backgrounds when their focus is on economically sophisticated environments, whereas top managers with generalist backgrounds tend to be preferred in institutionally ambiguous environments. Our findings enhance our understanding of the demand for executive generalists and specialists in the international business context by showing that top managers' backgrounds are matched with the prevailing type of complexity deriving from the international operations of the firm, thus, questioning the widely held notion that executive generalists are generally preferred over specialists. Our study has important implications for the composition of top management teams and the shaping of executive career paths at multinational firms.

Validity of the NIH toolbox cognitive battery in a healthy oldest-old 85+ sample.

To evaluate the construct validity of the NIH Toolbox Cognitive Battery (NIH TB-CB) in the healthy oldest-old (85+ years old). Our sample from the McKnight Brain Aging Registry consists of 179 individuals, 85 to 99 years of age, screened for memory, neurological, and psychiatric disorders. Using previous research methods on a sample of 85 + y/o adults, we conducted confirmatory factor analyses on models of NIH TB-CB and same domain standard neuropsychological measures. We hypothesized the five-factor model (Reading, Vocabulary, Memory, Working Memory, and Executive/Speed) would have the best fit, consistent with younger populations. We assessed confirmatory and discriminant validity. We also evaluated demographic and computer use predictors of NIH TB-CB composite scores. Findings suggest the six-factor model (Vocabulary, Reading, Memory, Working Memory, Executive, and Speed) had a better fit than alternative models. NIH TB-CB tests had good convergent and discriminant validity, though tests in the executive functioning domain had high inter-correlations with other cognitive domains. Computer use was strongly associated with higher NIH TB-CB overall and fluid cognition composite scores. The NIH TB-CB is a valid assessment for the oldest-old samples, with relatively weak validity in the domain of executive functioning. Computer use's impact on composite scores could be due to the executive demands of learning to use a tablet. Strong relationships of executive function with other cognitive domains could be due to cognitive dedifferentiation. Overall, the NIH TB-CB could be useful for testing cognition in the oldest-old and the impact of aging on cognition in older populations.

A Reinforcement Meta-Learning framework of executive function and information demand

Gathering information is crucial for maximizing fitness, but requires diverting resources from searching directly for primary rewards to actively exploring the environment. Optimal decision-making thus maximizes information while reducing effort costs, but little is known about the neuro-computational implementation of this tradeoff. We present a Reinforcement Meta-Learning (RML) computational model that solves the trade-off between the value and costs of gathering information. We implement the RML in a biologically plausible architecture that links catecholaminergic neuromodulators, the medial prefrontal cortex and topographically organized visual maps and show that it accounts for neural and behavioral findings on information demand motivated by instrumental incentives and intrinsic utility. Moreover, the utility function used by the RML, encoded by dopamine, is an approximation of variational free energy. Thus, the RML presents a biologically plausible mechanism for coordinating motivational, executive and sensory systems generate visual information gathering policies that minimize free energy.

Building Neurodiversity-Inclusive Postsecondary Campuses: Recommendations for Leaders in Higher Education.

Building Neurodiversity-Inclusive Postsecondary Campuses: Recommendations for Leaders in Higher Education.

Hearts, flowers, and fruits: All children need to reveal their post-error slowing

Slowing down responses after errors (i.e., post-error slowing [PES]) is an established finding in adults. Yet PES in young children is still not well understood. In this study, we investigated (a) whether young children show PES in tasks with different types of cognitive conflict and differing demands on executive functions, (b) whether PES is adaptive and efficient in the sense that it is associated with better task performance, and (c) whether PES correlates between tasks. We tested 4- to 6-year-old children on the Funny Fruits task (FF; n = 143), a Stroop-like task that incorporates semantic conflict and taxes children’s inhibition skills, and the Hearts and Flowers task (HF; n = 170), which incorporates spatial conflict and taxes children’s inhibition skills in its incongruent block and taxes both inhibition and cognitive flexibility (rule-switching) skills in its mixed block. A subgroup of children were tested on both FF and HF (n = 74). Results revealed that, first, children showed PES in FF and both blocks of HF, indicating that PES occurs in both types of conflict and under varying executive demands. Second, PES was associated with task accuracy, but only for FF and the mixed HF. Third, a between-task association in PES emerged only between FF and the mixed HF. Together, these findings indicate that PES is still a developing strategy in young children; it is present but only adaptive for, and correlates between, semantic inhibition and spatial flexibility.

Short Duration Simulated Microgravity Models Improve Executive Function

PURPOSE: To determine whether executive function is altered during two variations of simulated microgravity head down tilt protocols. METHODS: 26 healthy volunteers (n=19 females and 7 males; 20.0 ± 1.7 years; 165.6 ± 24.5 cm; 71.1 ± 15.9 kg; mean±SD) took part in two randomly assigned separate simulated microgravity sessions consisting of 1.5 hours at -6° head down tilt (HDT) sessions. Each testing session lasted approximately 2.5 hours. One session consisted of the broadly used -6° HDT facing up (HDT-FU), while the other consisted of a -6° HDT facing down (HDT-FD) modification of the standard method. For each condition, the participant completed a computerized Stroop Color and Word Test during a thirty-minute horizontal position (0° tilt) prior to the interventions and again prior to the end of the 1.5-hour HDT protocols. The Stroop Color and Word Test consisted of 3 tasks (60 trials per task) including: 1) a Naming task, 2) an Inhibition task, and 3) an Inhibition/Switching task. To minimize the learning effect, both the HDT-FU and HDT-FD sessions were counterbalanced amongst all participants and were separated by a minimum of 48 hours. RESULTS: Our cognitive reaction time results demonstrate a main effect of time (pre HDT 777.60 ± 18.08ms vs post HDT 749.30 ± 19.11ms, p<0.01) and a main effect of Stroop Test (Naming < Inhibition < Inhibition/Switching, p<0.01). Additionally, we observed that the 1.5-hour protocol selectively improved the Inhibition/Switching reaction times (the most executive component) for both the HDT-FU (pre HDT-FU 945.68 ± 32.87ms vs post HDT-FU 903.16 ± 33.78ms, p=0.02) and HDT-FD (pre HDT-FD 961.25 ± 38.55ms vs post HDT-FD 868.91 ± 30.40ms, p<0.01). CONCLUSION: When executive demand is increased under short-term simulated microgravity head down tilt conditions, regardless of the position (face up or face down), cognitive reaction time is decreased, suggesting an improvement in overall cognitive function.

Multi-UAV Unbalanced Targets Coordinated Dynamic Task Allocation in Phases

Unmanned aerial vehicles (UAVs) can be used in swarms to achieve multiple tasks cooperatively. Multi-UAV and multi-target cooperative task assignments are difficult. To solve the problem of unbalanced, phased, cooperative assignment between UAVs and tasks, we establish an unbalanced, phased task assignment model that considers the constraints of task execution, time, and target task execution demand. Based on an improved consensus-based bundle algorithm (CBBA), we propose a two-tier task bidding mechanism. According to dynamic changes in new tasks, we study a dynamic assignment strategy and propose a mechanism based on task continuity adjustment and time windows. Finally, a simulation experiment is used to verify the feasibility and effectiveness of the proposed allocation method in multi-UAV target assignment scenarios. The results show that the dynamic task assignment strategy can efficiently assign random new tasks as they arise.

Implications of Overwhelmed Leadership: How Executive Job Demands Hinder Corporate Sustainability Performance

As implied by executive job demands theory, intensified job demands of a firm’s top executives limit their cognitive capacity and centralize the locus of decision-making, which may undermine corporate sustainability performance. The current study tests this effect, along with the impact of two contextual factors, to reveal that the negative influence of executive job demands is weaker if firms feature greater functional diversity and average tenure in their top management teams. In an extension of upper echelon theory, this study also outlines the influence of task challenges that confront strategic leaders on corporate sustainability performance.

Executive Job Demands and Innovation: Exploring the Role of CEO Emotions

Our study explores how Chief Executive Officers’ (CEOs) job demands and emotions influence innovation. Drawing on upper echelons theory and research on emotions, we propose that CEOs’ perceptions of job difficulty can hurt firm innovation through CEOs’ experience of negative emotional reactions. Additionally, we explore how CEOs with higher levels of emotional intelligence can mitigate how perceptions of job demands translate into negative emotional reactions. We test our predictions in a sample of CEOs and top management team members from 120 small- and medium-sized enterprises. We find that CEO job demands are positively associated with CEOs’ negative emotional reactions, which in turn have negative implications for firm innovation. We also find that two dimensions of emotional intelligence (self-appraisal and regulation) weaken the influence of CEO job demands on negative emotional reactions. Our research contributes to strategic leadership research by studying the organizational implications of executive job demands and CEO emotions.

Emotion Regulation and Strategic Decision Making: A Depletion of Resources Perspective

A growing body of evidence shows that making strategic decisions is emotionally draining and requires managers to devote significant effort to regulating emotions. However, theoretical models of strategic decision have not kept pace with these developments and largely overlook the role of emotion regulation. In this paper, we adopt a resource depletion perspective to examine how executives’ emotion regulation capabilities influence strategic decision processes and outcomes in dynamic environments. We propose that executive emotion regulation resources are vital for developing and sustaining novel representations of strategic opportunities, searching for distant solutions, and utilizing social systems for evaluating and selecting alternatives. Hence, the depletion of regulatory resources inhibits these processes and reduces the effectiveness of strategic decision making. By identifying interdependencies among executive emotion regulation capacity and the cognitive and social resources required for strategic decision making, our analysis extends understanding of the requirements for making strategic decisions in dynamic environments. We discuss implications for research on strategic decision making, executive job demands and dynamic managerial capabilities.

Loss of Neural Automaticity Contributes to Slower Walking in COPD Patients.

The physical impairments (e.g., slower walking speed) in patients with chronic obstructive pulmonary disease (COPD) have been attributed to peripheral characteristics (e.g., muscle atrophy). However, cognitive impairment may compromise motor control including walking automaticity. The objective of this study was to investigate PFC neural activity, evaluated using changes in oxygenated hemoglobin (ΔO2Hb), during preferred paced walking (PPW) in COPD patients and age-matched controls. The ΔO2Hb from the left and right dorsolateral PFC was measured using functional near-infrared spectroscopy. Fifteen COPD patients (age: 71 ± 8) and twenty age-matched controls (69 ± 7 years) participated. Two-way mixed ANOVA demonstrated that O2Hb in both groups decreased during PPW from the start (quintile 1; Q1) to the end (quintile 5; Q5) in the left dorsolateral and medial PFC. Q1 was comprised of the data during the first 20% of the task, while Q5 included data collected in the last 20% of the task duration. PPW duration ranged between 30.0 and 61.4 s in the control group and between 28.6 and 73.0 s in COPD patients. COPD patients demonstrated a higher O2Hb in Q5 compared to the negative O2Hb in controls in the right medial and dorsolateral PFC during PPW. PPW velocity was lower in COPD patients compared to controls (1.02 ± 0.22 vs. 1.22 ± 0.14 m/s, p = 0.005). Healthy older controls exhibited automaticity during walking unlike patients with COPD. The lesser decrease in O2Hb in COPD patients may be attributed to increased executive demands or affect-related cues (e.g., pain or dyspnea) during walking.

Altered striatal-opercular intrinsic connectivity reflects decreased aversion to losses in alcohol use disorder

The persistence of addictive behaviours despite their adverse consequences highlights decreased punishment sensitivity as a facet of decision-making impairments in Alcohol Use Disorder (AUD). This attitude departs from the typical loss aversion (LA) pattern, i.e. the stronger sensitivity to negative than positive outcomes, previously associated with striatal and limbic-somatosensory responsiveness in healthy individuals. Consistent evidence highlights decreased LA as a marker of disease severity in AUD, but its neural bases remain largely unexplored. AUD-specific modulations of frontolateral activity by LA were previously related to the higher executive demands of anticipating losses than gains, but the relationship between LA and executive/working-memory performance in AUD is debated.Building on previous evidence of overlapping neural bases of LA during decision-making and at rest, we investigated a possible neural signature of altered LA in AUDs, and its connections with executive skills, in terms of complementary facets of resting-state functioning. In patients, smaller LA than controls, unrelated to executive performance, reflected reduced connectivity within striatal and medial temporal networks, and altered connectivity from these regions to the insular-opercular cortex.AUD-specific loss-related modulations of intrinsic connectivity thus involved structures previously associated both with drug-seeking and with coding the trade-off between appetitive and aversive motivational drives. These findings fit the hypothesis that altered striatal coding of choice-related incentive value, and interoceptive responsiveness to prospective outcomes, enhance neural sensitivity to drug-related stimuli in addictions. LA and its neural bases might prove useful markers of AUD severity and effectiveness of rehabilitation strategies targeting the salience of negative choice outcomes.

Visual perspective taking is not automatic in a simplified Dot task: Evidence from newly sighted children, primary school children and adults

In the Dot task, children and adults involuntarily compute an avatar's visual perspective, which has been interpreted by some as automatic Theory of Mind. This interpretation has been challenged by other researchers arguing that the task reveals automatic attentional orienting. Here we tested a new interpretation of previous findings: the seemingly automatic processes revealed by the Dot task result from the high Executive Control demands of this verification paradigm, which taxes short-term memory and imposes perspective-switching costs. We tested this hypothesis in three experiments conducted in India with newly sighted children (Experiment 1; N = 5; all girls), neurotypical children (Experiment 2; ages 5–10; N = 90; 38 girls) and adults (Experiment 3; N = 30; 18 women) in a highly simplified version of the Dot task. No evidence of automatic perspective-taking was observed, although all groups revealed perspective-taking costs. A newly sighted child and the youngest children in our sample also showed an egocentric bias, which disappeared by age 10, confirming that visual perspective taking develops during the school years. We conclude that the standard Dot task imposes such methodological demands on both children and adults that the alleged evidence of automatic processes (either mindreading or domain general) may simply reveal limitations in Executive Control.