Demands cognitive

The effects of ebastine 10 mg on cognitive impairment have been assessed in 20 healthy volunteers who performed six types of attention-demanding cognitive tasks, together with objective measurements of reaction times and accuracy (66). Ebastine was compared with placebo and a positive control, chlorphenamine (chlorphenamine, 2 mg and 6 mg). Compared with placebo, ebastine had no effect on any objective cognitive test nor any effect on subjective sleepiness. In contrast, chlorphenamine significantly increased reaction times, decreased accuracy in cognitive tasks, and increased subjective sleepiness. The effect of chlorphenamine increased with plasma concentration. 

Formulation of hypotheses about operator s competencies, by interpreting their cognitive activities with reference to work demands, cognitive constraints and possible resources to manage workload. 

In the case of Poisson arrivals and exponential service, (7.5) is exact because in this case the network is product-form. In the case of Poisson arrivals but general service, (7.6) is exact as each station becomes an M/G/1 queue, for which the Pollaczek-Khintchine formula (43) holds. We see by comparing (63) and (64) that the flow line has a smaller approximate expected number-in-system if and only if cj s 1/2. This leads us to conclude that low variability favors the flow line. Thus, repetitive tasks are suited to the flow-fine arrangement, whereas tasks demanding cognitive skills may be better grouped. 

Second, there are student characteristics involved in multimedia learning. Wu et al. (2001) indicate that students prefer to represent chemical entities in certain ways. Additionally, visuospatial abilities play an important role in chemistry learning, and many multimedia tools are highly demanding of cognitive resomces (Wu and Shah, 2004). The design of multimedia tools should take students preferences and visuospatial abilities into consideration so that the tools support all students in learning about the triplet relationship. 

Scholey AB and Kennedy DO (2002). Acute, dose-dependent cognitive effects of Ginkgo biloba, Panax Ginseng and their combination in healthy young volunteers Differential interactions with cognitive demand. Human Psychopharmacology - Clinical and Experimental, 17, 35-44. 

Scholey AB, Harper S and Kennedy DO (2001). Cognitive demand and blood glucose. Physiology and Behavior, 73, 585-592. 

A new area of research concerns exposure assessment for beryllium in the production of nuclear weapons at nuclear defense industries. A safe level of exposure to beryllium is still unknown. Potential explanations include (1) the current exposure standard may not be protective enough to prevent sensitization, or (2) past exposure surveillance may have underestimated the actual exposure level because of a lack of understanding of the complexity of beryllium exposures. Task-based exposure assessment provides information not directly available through conventional sampling. It directly links exposure to specific activity associated with contaminant generation and provides in-depth evaluation of the worker s role in a specific task. In-depth task analysis is being used to examine physical, postural, and cognitive demands of various tasks. 

McNay EC, Eries TM, Gold PE. 2000. Decreases in rat extracellular hippocampal glucose concentration associated with cognitive demand during a spatial task. Proc Natl Acad Sci USA 97(6) 2881-2885. 

Duncan J, Owen AM (2000) Common regions of the human frontal lobe recruited by diverse cognitive demands. Trends Neurosci 23 475 83... 

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