Relevance. The problem of change in cognitive performance under more complicated activity conditions is of interest to psychologists and scholars in neuro- and informational sciences. Without its solution it’s impossible to model cognitive activity and predict its efficiency in different situations. Tasks that access attention and working memory resources are of particular interest. The level of emotional tension is often considered a factor hampering the task solution. Previously, authors showed that emotional tension leads to change in spatial distribution of attention and in cognitive strategies that provide solutions to more complex tasks.

Objective. To determine how test anxiety influences the mental rotation task performance. 

Methods and sampling. Two groups of subjects were asked to solve the mental rotation task either under emotionally neutral conditions or under the conditions when task performance was significant to the subject. The emotional state of subjects was controlled with questionnaires. In addition, the individual level of stress resistance was measured.

Results. We obtained a linear effect of test-stimulus orientation on reaction time (that was Shepard and Metzler’s discovery). In the situation of emotional tension the average solving time slightly increased and the number of correct answers slightly decreased. Any significant change in task solving strategies was related to the level of stress resistance in subjects.

Conclusion. The cognitive strategies are transformed under impact of emotional tension and whether the subject would choose a constructive strategy or a non-constructive one depends on the subject’s stress resistance. Subjects with lower stress resistance have difficulty distributing cognitive resources, rotating figures in the mental space. 

Relevance. The study of human functional states within the structural-functional approach is an important development in work psychology. As work becomes more intensive and cognitive, the study of mental fatigue becomes more important.

Objective. To validate cognitive tests for the assessment of mental fatigue cognitive effects, and to replicate cognitive effects of fatigue observed within the structural-functional approach.

Methodology. 27 subjects (18 male), engineers in a high-tech engineering firm, and took part in the study conducted over a working day in the morning and in the evening. Mental fatigue was assessed with a questionnaire. The cognitive tests included a test of attention switching, a test for working memory, and the Sternberg’s short-term memory search task.

Results. A reduction in attention switching and memory search efficiency was found. These results in a good concordance with previous results and indicate a reduction in the availability of top-down cognitive control resources. Evidence was found for transition towards sequential self-terminating memory search strategy under mental fatigue. No reduced working memory was found, which may be related to the meta-cognitive regulation of functional states.

Conclusions. Mental fatigue is associated with a reduction in the control of attention and short-term memory, related to the depletion of cognitive control resources. Individual cognitive reactions to fatigue are important. Future developments of the structural-functional approach may include the development of new diagnostics tools, the usage of cognitive modeling, the orientation to the analysis of the individual differences, and the integration of the structural-functional approach with resource approaches to cognition.