[Cortical interactions in the beta2-rhythm during examination stress].

Two groups of students: with higher and lower amplitudes of the baseline alpha-rhythm differed in the level of anxiety during examinations and the level of cortical interactions. Cognitive tasks were presented in three experimental conditions: before the examinations, immediately after the examinations, and on a usual day of academic semester (control). Subjects with initially higher alpha-rhythm amplitude had lower level of anxiety in a stress situation. Cognitive performance of these subjects before examinations was associated with an increase in the number of functional connections between different cortical areas. In the subjects with initially lower alpha-rhythm amplitude, the level of cortical interactions before examinations was higher, but presentation of the cognitive task led to a decrease in the number of intracortical connections. However, the localization of these connections was task-specific.