An analysis of regulatory mechanisms during sustained task execution in cognitive, motor and sensory tasks
- Tau, Sethunya Harriet Hlobisa
- Authors: Tau, Sethunya Harriet Hlobisa
- Date: 2013 , 2013-10-11
- Subjects: Work -- Physiological aspects , Work -- Psychological aspects , Fatigue , Attention , Mental fatigue , Human information processing , Decision making , Labor productivity , Employees -- Workload , Performance
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5140 , http://hdl.handle.net/10962/d1006806 , Work -- Physiological aspects , Work -- Psychological aspects , Fatigue , Attention , Mental fatigue , Human information processing , Decision making , Labor productivity , Employees -- Workload , Performance
- Description: Fatigue is a state that, although researched for many years, is still not completely understood. Alongside this lack of a general understanding of fatigue is a lack of knowledge on the processes involved in the regulation of fatigue. The existing theories relating to regulation are focussed on mental effort regulation, suggesting that performance outcomes are co-ordinated by effort regulation that functions by making alterations to physiological processes and strategic adjustments at a cognitive level in response to cognitive demands and goals. Since fatigue is a multi-dimensional construct with psychological, physiological, and behavioural effects that respond to endogenous and exogenous variables, it follows then that fatigue assessment techniques ought to include multi-dimensional measures to acquire a holistic depiction of the fatigue symptom. This study aimed to assess whether or not a mechanism that regulated fatigue during sustained task execution could be identified and whether this mechanism resulted in regulation patterns that were distinct to a specific task. An additional aim of the study was on assessing whether the manner in which performance, psychophysical and subjective variables were modified over time followed a similar regulation pattern. The research design was aimed at inducing task-related fatigue twice on two different occasions in the same participants and evaluating the resultant changes in fatigue manifestation. This was done to assess the ability of participants to cope with fatigue as a result of previous experience. The research protocol included three tasks executed for an hour aimed at targeting and taxing the sensory, cognitive, motor resources, each task performed twice. 60 participants were recruited to participate in the current study, with 20 participants – 10 males and 10 females – randomly assigned to each of the three tasks. The cognitive resource task consisted of a memory recall task relying on working memory intended to evaluate the extent of reductions in memory and attention. The sensory resource task consisted of a reading task measuring visual scanning and perception designed to evaluate the extent of reduced vigilance. The motor resource task consisted of a modified Fitts’ stimulus response task targeted at monitoring the extent of movement timing disruption. Performance measures comprised of: response delay and the number of correctly identified digits during the cognitive resource task, the amount of correctly identified errors and reading speed during the sensory resource task, response time during the motor resource task, and responses to simple auditory reaction time tests (RTT) initiated at intervals during the task and then again at the end of each task. Physiological measures included ear temperature, eye blink frequency and duration, heart rate (HR), and heart rate variability (HRV). Subjective measures included the use of the Ratings of Perceived Exertion Category Ratio 10 scale (RPE CR 10) to measure cognitive exertion and the NASA-Task Load Index (NASA-TLX) to index mental workload. Eye blink frequency and duration, HR and HRV were sensitive to the type of task executed, showing differing response patterns both over the different tasks and over the two test sessions. The subjective measures indicated increasing RPE ratings over time in all tasks while the NASA-TLX indicated that each task elicited different workloads. Differing task performance responses were measured between the 1st test session and the 2nd test session during all tasks; while performance was found to improve during the 2nd test session for the motor and sensory tasks, it declined during the cognitive task. The findings of this research indicate that there was a regulatory mechanism for fatigue that altered the manner in which performance, psychophysical and subjective variables were modified over time, initiating a unique fatigue regulation pattern for each variable and each task. This regulation mechanism is understood to be a proactive and protective mechanism that functions through reducing a person’s ability to be vigilant, attentive, to exercise discernment, and to direct their level of responsiveness, essentially impacting how the body adapts to and copes with fatigue. The noted overall findings have industry implications; industries should consider accounting for the effects of this regulatory mechanism in their fatigue management interventions, specifically when designing job rotation and work/rest schedules because each cognitive task, having elicited a unique fatigue regulation pattern, ought to also have a different management program. , Microsoft� Office Word 2007 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2013
- Authors: Tau, Sethunya Harriet Hlobisa
- Date: 2013 , 2013-10-11
- Subjects: Work -- Physiological aspects , Work -- Psychological aspects , Fatigue , Attention , Mental fatigue , Human information processing , Decision making , Labor productivity , Employees -- Workload , Performance
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5140 , http://hdl.handle.net/10962/d1006806 , Work -- Physiological aspects , Work -- Psychological aspects , Fatigue , Attention , Mental fatigue , Human information processing , Decision making , Labor productivity , Employees -- Workload , Performance
- Description: Fatigue is a state that, although researched for many years, is still not completely understood. Alongside this lack of a general understanding of fatigue is a lack of knowledge on the processes involved in the regulation of fatigue. The existing theories relating to regulation are focussed on mental effort regulation, suggesting that performance outcomes are co-ordinated by effort regulation that functions by making alterations to physiological processes and strategic adjustments at a cognitive level in response to cognitive demands and goals. Since fatigue is a multi-dimensional construct with psychological, physiological, and behavioural effects that respond to endogenous and exogenous variables, it follows then that fatigue assessment techniques ought to include multi-dimensional measures to acquire a holistic depiction of the fatigue symptom. This study aimed to assess whether or not a mechanism that regulated fatigue during sustained task execution could be identified and whether this mechanism resulted in regulation patterns that were distinct to a specific task. An additional aim of the study was on assessing whether the manner in which performance, psychophysical and subjective variables were modified over time followed a similar regulation pattern. The research design was aimed at inducing task-related fatigue twice on two different occasions in the same participants and evaluating the resultant changes in fatigue manifestation. This was done to assess the ability of participants to cope with fatigue as a result of previous experience. The research protocol included three tasks executed for an hour aimed at targeting and taxing the sensory, cognitive, motor resources, each task performed twice. 60 participants were recruited to participate in the current study, with 20 participants – 10 males and 10 females – randomly assigned to each of the three tasks. The cognitive resource task consisted of a memory recall task relying on working memory intended to evaluate the extent of reductions in memory and attention. The sensory resource task consisted of a reading task measuring visual scanning and perception designed to evaluate the extent of reduced vigilance. The motor resource task consisted of a modified Fitts’ stimulus response task targeted at monitoring the extent of movement timing disruption. Performance measures comprised of: response delay and the number of correctly identified digits during the cognitive resource task, the amount of correctly identified errors and reading speed during the sensory resource task, response time during the motor resource task, and responses to simple auditory reaction time tests (RTT) initiated at intervals during the task and then again at the end of each task. Physiological measures included ear temperature, eye blink frequency and duration, heart rate (HR), and heart rate variability (HRV). Subjective measures included the use of the Ratings of Perceived Exertion Category Ratio 10 scale (RPE CR 10) to measure cognitive exertion and the NASA-Task Load Index (NASA-TLX) to index mental workload. Eye blink frequency and duration, HR and HRV were sensitive to the type of task executed, showing differing response patterns both over the different tasks and over the two test sessions. The subjective measures indicated increasing RPE ratings over time in all tasks while the NASA-TLX indicated that each task elicited different workloads. Differing task performance responses were measured between the 1st test session and the 2nd test session during all tasks; while performance was found to improve during the 2nd test session for the motor and sensory tasks, it declined during the cognitive task. The findings of this research indicate that there was a regulatory mechanism for fatigue that altered the manner in which performance, psychophysical and subjective variables were modified over time, initiating a unique fatigue regulation pattern for each variable and each task. This regulation mechanism is understood to be a proactive and protective mechanism that functions through reducing a person’s ability to be vigilant, attentive, to exercise discernment, and to direct their level of responsiveness, essentially impacting how the body adapts to and copes with fatigue. The noted overall findings have industry implications; industries should consider accounting for the effects of this regulatory mechanism in their fatigue management interventions, specifically when designing job rotation and work/rest schedules because each cognitive task, having elicited a unique fatigue regulation pattern, ought to also have a different management program. , Microsoft� Office Word 2007 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2013
Job satisfaction as a moderator of the relationship between work-family conflict and stress among female civil service managers in the Department of Education in the King William’s Town District
- Authors: Binqela, Thembisa
- Date: 2013
- Subjects: Job satisfaction -- South Africa -- Eastern Cape , Job stress -- South Africa -- Eastern Cape , Work -- Psychological aspects , Role conflict , Women employees -- South Africa -- Eastern Cape , Women executives -- South Africa -- Eastern Cape , Working mothers -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MCom (Industrial Psychology)
- Identifier: vital:11553 , http://hdl.handle.net/10353/d1007092 , Job satisfaction -- South Africa -- Eastern Cape , Job stress -- South Africa -- Eastern Cape , Work -- Psychological aspects , Role conflict , Women employees -- South Africa -- Eastern Cape , Women executives -- South Africa -- Eastern Cape , Working mothers -- South Africa -- Eastern Cape
- Description: The research at hand focuses on job satisfaction as a moderator of the relationship between work-family conflict and stress among female civil service managers in the Department of Education in the King William’s Town District. Samples of 100 employees were used in the study. The data was collected by means of a questionnaire which consisted of the following sections: (i) a biographical and occupational data questionnaire,(ii) Eum, Lee, and Paek’s (2007) Effort-Reward Imbalance questionnaire, (iii) Bedenia, Burke, and Moffat’s (1998) Short-form Work-family Conflict questionnaire, and (iv) Halpern’s (1966) Job Satisfaction questionnaire. The data were analyzed by means of Pearson’s Correlation Technique, Multiple Regression Analysis, and Analysis of Variance. The results showed that job satisfaction does not moderate the relationship between work-family conflict and occupational stress. The study also found a significant positive correlation between work-family conflict and occupational stress and between work-family conflict and job satisfaction. It also showed that both work-family conflict and job satisfaction respectively accounted for a significant proportion of variance in occupational stress. The thesis ends with several recommendations for future research and for future professional or managerial practice.
- Full Text:
- Date Issued: 2013
- Authors: Binqela, Thembisa
- Date: 2013
- Subjects: Job satisfaction -- South Africa -- Eastern Cape , Job stress -- South Africa -- Eastern Cape , Work -- Psychological aspects , Role conflict , Women employees -- South Africa -- Eastern Cape , Women executives -- South Africa -- Eastern Cape , Working mothers -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MCom (Industrial Psychology)
- Identifier: vital:11553 , http://hdl.handle.net/10353/d1007092 , Job satisfaction -- South Africa -- Eastern Cape , Job stress -- South Africa -- Eastern Cape , Work -- Psychological aspects , Role conflict , Women employees -- South Africa -- Eastern Cape , Women executives -- South Africa -- Eastern Cape , Working mothers -- South Africa -- Eastern Cape
- Description: The research at hand focuses on job satisfaction as a moderator of the relationship between work-family conflict and stress among female civil service managers in the Department of Education in the King William’s Town District. Samples of 100 employees were used in the study. The data was collected by means of a questionnaire which consisted of the following sections: (i) a biographical and occupational data questionnaire,(ii) Eum, Lee, and Paek’s (2007) Effort-Reward Imbalance questionnaire, (iii) Bedenia, Burke, and Moffat’s (1998) Short-form Work-family Conflict questionnaire, and (iv) Halpern’s (1966) Job Satisfaction questionnaire. The data were analyzed by means of Pearson’s Correlation Technique, Multiple Regression Analysis, and Analysis of Variance. The results showed that job satisfaction does not moderate the relationship between work-family conflict and occupational stress. The study also found a significant positive correlation between work-family conflict and occupational stress and between work-family conflict and job satisfaction. It also showed that both work-family conflict and job satisfaction respectively accounted for a significant proportion of variance in occupational stress. The thesis ends with several recommendations for future research and for future professional or managerial practice.
- Full Text:
- Date Issued: 2013
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