The effect of human autonomy and robot work pace on perceived workload in human-robot collaborative assembly work

Collaborative robots (in short: cobots) have the potential to assist workers with physically or cognitive demanding tasks. However, it is crucial to recognize that such assistance can have both positive and negative effects on job quality. A key aspect of human-robot collaboration is the interdependence between human and robotic tasks. This interdependence influences the autonomy of the operator and can impact the work pace, potentially leading to a situation where the human's work pace becomes reliant on that of the robot. Given that autonomy and work pace are essential determinants of job quality, design decisions concerning these factors can greatly influence the overall success of a robot implementation. The impact of autonomy and work pace was systematically examined through an experimental study conducted in an industrial assembly task. 20 participants engaged in collaborative work with a robot under three conditions: human lead (HL), fast-paced robot lead (FRL), and slow-paced robot lead (SRL). Perceived workload was used as a proxy for job quality. To assess the perceived workload associated with each condition was assessed with the NASA Task Load Index (TLX). Specifically, the study aimed to evaluate the role of human autonomy by comparing the perceived workload between HL and FRL conditions, as well as the influence of robot pace by comparing SRL and FRL conditions. The findings revealed a significant correlation between a higher level of human autonomy and a lower perceived workload. Furthermore, a decrease in robot pace was observed to result in a reduction of two specific factors measuring perceived workload, namely cognitive and temporal demand. These results suggest that interventions aimed at increasing human autonomy and appropriately adjusting the robot's work pace can serve as effective measures for optimizing the perceived workload in collaborative scenarios.

Traffic Noise at Moderate Levels Affects Cognitive Performance: Do Distance-Induced Temporal Changes Matter?

Urbanization leads to an increased demand for urban housing, which can be met by building dwellings closer to streets. Regulations often limit equivalent sound pressure levels which do not account for changes in time structure that occur when decreasing the road distance. This study investigates the effect of such temporal changes on subjective workload and cognitive performance. A group of 42 participants performed a continuous performance test as well as a NASA-TLX workload test under three different sound conditions, i.e., close traffic, far traffic, both with the same equivalent sound pressure level of LAeq≈40 dB, and silence. Additionally, participants answered a questionnaire regarding their preferred acoustic environment for concentrated working. Significant effects of the sound condition on the multivariate workload results as well as on the number of commission errors in the continuous performance test were found. Post hoc tests showed no significant differences between the two noise conditions, but there were significant differences between noise and silence. This indicates that moderate traffic noise levels can influence cognitive performance and perceived workload. If there is a difference in the human response to road traffic noise with constant LAeq but different time structures, the used methods are not suitable to detect them.

Research on the Applicability of Touchscreens in Manned/Unmanned Aerial Vehicle Cooperative Missions

The suitability of touchscreens for human-computer interaction in manned/unmanned aerial vehicle cooperative missions remains uncertain, especially in situations that are time-sensitive with variations in difficulty levels. The purpose of this study is to determine the feasibility of touchscreen applications in manned/unmanned aerial vehicle cooperative missions and the magnitude of the effects of time pressure and task difficulty. In contrast to previous studies, a combination of performance and perceptual load measures was used to divide errors into disposition errors, undetected errors, and miscalculation errors to explore specific error mechanisms, set up typical manned/unmanned aerial vehicle cooperative human-computer interaction tasks, and set up antecedent features for potential factors. Thirty subjects participated in an experiment that required the use of touchscreens or keyboards to perform a human-computer interaction task in a simulated manned/unmanned aerial vehicle cooperative mission. Experiments were set at three task difficulties: low, medium, and high, and were matched to a set time pressure or no time pressure for two seconds for low difficulty, three seconds for medium difficulty, and four seconds for high difficulty. The results showed that the touchscreens improved the participants' response speed at a time pressure of 2 s or less compared with the use of a general input device; however, the task error rate also increased significantly. The higher the task difficulty was, the worse the performance was and the greater the perceived workload of the participants. The application of touchscreens in dynamic environments subjected the participants to greater physical demands. The performance of participants using a keyboard was no better than that when touchscreens were used during the experiment. Moreover, touchscreens did not significantly improve participant performance. The results support the possibility of using touchscreens in manned/unmanned aerial vehicle cooperative missions.

Unveiling the Effects of Stressors on Task Performance: The Role of Thriving at Work and Resilience

This study unveils the effects of stressors on employees' task performance through the mediating role of thriving at work (TAW) and a moderating role of resilience (RES) grounding on conservation of resources (COR) theory. The analysis of collected data from 331 supervisor-employee dyads in the hospitality sector of China explicates that the role conflict (RC) and perceived workload have a negative influence on TAW, and thriving has a positive relationship with task performance. The results corroborate the mediating role of TAW between RC, perceived workload, and task performance. Furthermore, the RES suppressed the negative relationship between RC, perceived workload, and TAW. Moreover, our study underscores the theoretical and practical contributions regarding the negative influence of stressors on TAW by exhibiting the importance of the COR mechanism for employees' behavioral outcomes.

Implementation of a triage nurse role and the effect on hospitalist workload

OBJECTIVES

Hospital medicine groups vary staffing models to match available workforce with expected patient volumes and acuity. Larger groups often assign a single hospitalist to triage pager duty which can be burdensome due to frequent interruptions and multitasking. We introduced a new role, the Triage nurse, to hold the triage pager and distribute patients. We sought to determine the effect of this Triage Nurse on the perceived workload of hospitalists and frequency of pages.

METHODS

We partnered with our patient throughput department to implement the Triage Nurse role who took the responsibility of tracking and distributing admissions among three admitting physicians along with coordinating report. We used the National Aeronautics and Space Administration-Task Load Index (NASA-TLX) to measure perceived workload and accessed pager logs of admitters for 3 months before and after implementation.

RESULTS

Overall, 50 of an expected 67 NASA-TLX surveys (74.6%) were returned in the pre-intervention period and 64 of 92 (69.6%) were returned in the post-intervention period. We found a statistically significant reduction in the domains of physical demand, temporal demand, effort and frustration from pre- to post-intervention periods (p < 0.01). There was also a significant decrease in the performance domain (p = 0.01) with a lower number indicative of better perceived performance. There was a significant reduction in the mean number of pages received by admitting hospitalists over their 9-h shifts (81.3 + 17.3 vs 52.4 + 7.3; p < 0.01).

CONCLUSION

The implementation of the Triage Nurse role was associated with a significant decrease in the perceived workload of admitting hospitalists. Our findings are important because workload and interruptions can contribute to errors and burnout. Future studies should test interventions to improve hospitalist workload and evaluate their effect on patient outcomes and physician wellness.

Eye-Tracking Metrics Predict Perceived Workload in Robotic Surgical Skills Training

OBJECTIVE

The aim of this study is to assess the relationship between eye-tracking measures and perceived workload in robotic surgical tasks.

BACKGROUND

Robotic techniques provide improved dexterity, stereoscopic vision, and ergonomic control system over laparoscopic surgery, but the complexity of the interfaces and operations may pose new challenges to surgeons and compromise patient safety. Limited studies have objectively quantified workload and its impact on performance in robotic surgery. Although not yet implemented in robotic surgery, minimally intrusive and continuous eye-tracking metrics have been shown to be sensitive to changes in workload in other domains.

METHODS

Eight surgical trainees participated in 15 robotic skills simulation sessions. In each session, participants performed up to 12 simulated exercises. Correlation and mixed-effects analyses were conducted to explore the relationships between eye-tracking metrics and perceived workload. Machine learning classifiers were used to determine the sensitivity of differentiating between low and high workload with eye-tracking features.

RESULTS

Gaze entropy increased as perceived workload increased, with a correlation of .51. Pupil diameter and gaze entropy distinguished differences in workload between task difficulty levels, and both metrics increased as task level difficulty increased. The classification model using eye-tracking features achieved an accuracy of 84.7% in predicting workload levels.

CONCLUSION

Eye-tracking measures can detect perceived workload during robotic tasks. They can potentially be used to identify task contributors to high workload and provide measures for robotic surgery training.

APPLICATION

Workload assessment can be used for real-time monitoring of workload in robotic surgical training and provide assessments for performance and learning.

The Crossover Effects of Supervisors' Workaholism on Subordinates' Turnover Intention: The Mediating Role of Two Types of Job Demands and Emotional Exhaustion

Although much research has been conducted on workaholism, its crossover effects remain uninvestigated, especially in the context of organizations. Based on the job demands-resources (JD-R) model of burnout and the conservation of resources (COR) theory, we established a dual-path structural model to examine the effects of supervisors’ workaholism on subordinates’ turnover intention through two types of job demands (perceived workload and interpersonal conflict) as well as subordinates’ emotional exhaustion. The results revealed that supervisors’ workaholism is positively related to subordinates’ emotional exhaustion through increased perceived workload and interpersonal conflict, which result in subordinates’ turnover intention. This study has made a contribution to the literature by extending the scope of workaholism research from self-perspective to other-perspective. The findings also have practical implications for organizations and their human resources (HR) practitioners.

Prototyping the Automated Food Imaging and Nutrient Intake Tracking System: Modified Participatory Iterative Design Sprint

BACKGROUND

A total of 45% of older adults living in long-term care (LTC) have some form of malnutrition. Several methods of tracking food and fluid intake exist, but they are limited in terms of their accuracy and ease of application. An easy-to-use, objective, accurate, and comprehensive food intake system designed with LTC in mind may provide additional insights regarding nutritional support systems and nutritional interventions.

OBJECTIVE

The aim of this study was to conduct a multistage participatory iterative design sprint of a Goldilocks quality horizontal prototype for the Automated Food Imaging and Nutrient Intake Tracking (AFINI-T) system. Specific design objectives included the following: (1) identify practice-relevant problems and solutions through user-centered participatory design, (2) mitigate feasibility-related barriers to uptake, and (3) employ user-centered technology development.

METHODS

A 6-stage iterative participatory design sprint was developed and executed. A total of 38 participants and advisors representing 15 distinct roles (eg, personal support worker, nurse, and dietitian) were engaged in the design sprint. Subjective workload (Raw Task Load Index), subjective usability scales, and a modified Ravden checklist were used to assess project advisors' perceptions of the AFINI-T system prototype compared with the current method of food and fluid intake charting.

RESULTS

The top priorities for this system were identified as the following: ease of use, high accuracy, system reliability, ease of maintenance, and requirement of integrating with the current PointClickCare system. Data from project advisors informed design decisions leading to a Goldilocks quality horizontal prototype of the AFINI-T system. Compared with the current food and fluid intake charting system, AFINI-T was perceived to have the following: less time demands (t_10.8=4.89; P<.001), less effort (t_13.5=5.55; P<.001), and less frustration (t_13.0=3.80; P=.002). Usability ratings of the AFINI-T prototype were high, with a subjective usability score mean of 89.2 and the highest ratings on a modified Ravden usability checklist of "very satisfactory" for 7 out of 8 sections.

CONCLUSIONS

The AFINI-T concept system appears to have good practice relevance as a tool for an intelligent food and fluid intake tracking system in LTC. The AFINI-T concept system may provide improvement over the current system, and advisors are keen to try the AFINI-T system. This research gives tangible examples of how the sprint method can be adapted and applied to the development of novel needs-based application-driven technology.

Live to Work or Work to Live? An Age-Moderated Mediation Model on the Simultaneous Mechanisms Prompted by Workaholism Among Healthcare Professionals

The "aging population" implies an increased proportion of older professionals and a growing demand for healthcare services. Healthcare professionals are often highly committed to their work which can be reflected in high levels of workaholism, being a double-edged sword that can prompt both positive and negative mechanisms, differently affecting younger and older healthcare workers. The present study aims to gain insights into the relationships between healthcare professionals' age, workaholism and job satisfaction, by estimating the sequential mediating roles of workload perceptions and emotional exhaustion. We used original survey data, including information on 750 healthcare professionals. Overall, the negative relationship between workaholism and job satisfaction was shown to be sequentially (and partially) mediated by workload perceptions and emotional exhaustion. Multi-Group SEM analyses revealed differences across three age groups (under 35; between 35 and 50; over 50). Only in the two younger age groups, we found a direct and positive relationship between workaholism and job satisfaction. In all age groups, we found the negative relationship between workaholism and job satisfaction to be sequentially (and partially) mediated by workload perceptions and emotional exhaustion. The indirect effects were relatively stronger in the younger age group. Workaholism can prompt both a "gain spiral" and "a loss spiral" among healthcare professionals. The first reflects workaholism to function as a job resource fostering job satisfaction (only for the two younger age groups). The second reflects workaholism to function as a job demand reducing job satisfaction. This mechanism was shown to be stronger with an increasing age.

Debunking superstition: Analyzing the cloud phenomenon in apheresis-Results of a 35-month study

Many practitioners believe in the phenomenon of being labeled either a "black cloud" or "white cloud" while on-call. A "white-cloud" physician is usually defined as one who sees fewer cases while a "black-cloud" is one who often receives more cases. To evaluate these phenomena, a 35-month prospective study was designed to evaluate the number of times apheresis staff was involved with emergent apheresis procedures at a large institution in the off hours between 10 pm and 7 am, since this is the time period when significant resources have to be mobilized to perform the procedure. During the study period, 92 emergent procedures (or "black-cloud" events, 8.6%) occurred. The median time between two consecutive "black-cloud" events was 9 days (range: 1-45 days). We found that there is no statistically significant association between the occurrence of "black-cloud" events and attending physicians (P = .99), nurses who had 56 or more days on-call during the course of the study (P = .28), year (P = .85), day of the week (P = .099), month (P = .57), or season of the year (P = .47). Therefore, the findings from this prospective 35-month confirmation study did not support the common perception that physicians or nurses maybe either "black clouds" or "white clouds." It is important that this meaningful result be shared with apheresis practitioners given that the label of being a "black cloud" may have undesirable psychological implications to the physicians and nurses.

"Black cloud" vs. "white cloud" physicians - Myth or reality in apheresis medicine?

BACKGROUND

Many practitioners believe in the phenomenon of either being labeled a "black cloud" or "white cloud" while on-call. A "white-cloud" physician is one who usually gets fewer cases. A "black-cloud" is one who often has more cases. It is unclear if the designation is only superstitious or if there is some merit. Our aim is to objectively assess this phenomenon in apheresis medicine at our center.

METHODS

A one-year prospective study from 12/2014 to 11/2015 was designed to evaluate the number of times apheresis physicians and nurses were involved with emergent apheresis procedures between the hours from 10 PM and 7 AM. Other parameters collected include the names of the physician, apheresis nurse, type of emergent apheresis procedure, day of the week, and season of the year.

RESULTS

During the study period, 32 emergent procedures (or "black-cloud" events) occurred. The median time between two consecutive events was 8 days (range: 1-34 days). We found no statistically significant association between the "black-cloud" events and attending physicians, nurses, day of the week, or season of the year by Chi-square and Fisher's analyses. However, exploratory analysis using association rule demonstrated that "black-cloud" events were more likely to happen on Thursday (2.19 times), with attending physician 2 (1.18 times), and during winter (1.15 times).

CONCLUSION

The results of this pilot study may support the common perception that some physicians or nurses are either "black cloud" or "white cloud". A larger, multi-center study population is needed to validate the results of this pilot study.