Task load

Figure 10. Averaged oxygenation level for left and right forehead for varied number of aircrafts for high and low task load corresponding to the number of yellow tracks.

K. Izzetoglu, S. Bunce, M. Izzetoglu, B. Onaral, and K. Pourrezaei. fnir spectroscopy as a measure of cognitive task load. In Proceedings of the 25th Annual International Conference of the IEEE EMBS, pages 3431-3434, 2003. 

Task-time line analysis Temporal onset, duration, and concurrences Task-load estimates Task complexity... 

Lorenz, J., Lorenz, B., Heineke, M. (1992). Effect of mental task load on fronto-central theta activity in a deep saturation dive to 450 msw. Undersea Biomedcal Research, 19, 243-262. 

Second, to check the workload manipulation the participants were asked to complete the NASA-Task Load Index (TLX Hart Staveland, 1988). The TLX is a subjective measure of workload composed of six rating scales that address the contributions of various sources of workload. Prinzel et al. (in press) had their participants complete the TLX after each 16-minute period. 

Regarding workloa4 more switches between task modes were made in the high workload eondition. Participants also rated the high workload condition higher on the TLX, but there were no differences between feedback conditions. Thus, the system appears to be sensitive to manipulations in task load. 

Hart, S. G., Staveland, L. E. (1988). Development of NASA-TLX (Task Load Index) Results of empirical and theoretical research. In P A. Hancock N. Meshkati (Eds.X Human mental workload (pp. 139-183). Amsterdam North-Holland. 

When interpreting SPs in relation to practice effects, one should expect a SP decrease in the course of practicing the tasks. However, the negativity of SPs increased across time from the first to the last work period. Under the partieular condition of the adaptive adjustment of task load, all effort-lowering effects of practice were continuously compensated for by decreasing the duration of task presentation after a correct calculation. Therefore, SP increase over the course of the experiment may be interpreted as refleeting inereased effort expenditure to ensure the required performance outcome. 

External Environment Hardware Software Condttkms Task Load Time Load Other Loads... 

Non-task Load Passive Information Load Vjask Complexity ... 

Perceived Task Load Perceived Time Load Perceived Other Loads Perceived Situation Severity Perceived Situation Urgency Percmved Decision Responsttiarty fercepBon of Alarms A... 

Performance Strategies Under High Task Load... 

The consistency of a task influences performance directly (Maynard and Hakel, 1997) and indirectly by the choice of strategy or by the augmentation of effort (Campbell, 1991 Locke, Shaw, Saari and Latham, 1981). Action control theory defines tasks as goals that need to be achieved by executing certain operations. These operations are limited by prevailing conditions (Frese and Zapf, 1994). How a goal is achieved may differ in terms of effort spent, time needed, and reliability. The results a person can achieve in a certain task depend on his/her skills. Task complexity is relevant for the question of how to handle high task load situations. Complexity is described in objective and subjective terms. (For an overview, see... 

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