Modulation of Low-Frequency EEG Rhythms under Conditions of an Activation Reaction: Dependence on Psychological Characteristics of Personality |
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Authors: | I N Konareva |
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Institution: | 1.Vernadskii Tavricheskii National University,Simferopol’,Ukraine |
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Abstract: | In a group of 118 adults of both sexes, we studied modulation of the low-frequency EEG components (δ and θ rhythms) under
conditions of an activation reaction resulting from opening of the eyes. Typical changes of the α rhythm (considerable depression
in a great majority of the tested subjects) was accompanied by diverse, in their direction, shifts of the spectral power (SP)
of the δ and θ components in different subjects. The δ rhythm power increased upon the reaction of activation in 79 subjects
and decreased in 29 subjects, while changes in this index in different hemispheres were of opposite directions in 10 persons.
According to the reactivity of the θ rhythm, the respective subgroups included 36, 75, and 7 subjects. Values of the differential
coefficients of reactivity (DCR) for the δ and θ rhythms demonstrated significant positive correlation (r = 0.616 and 0.603
for the left and right hemispheres, respectively). Indices of reactivity of the α and θ rhythms also correlated but less closely
(r about 0.3). At the same time, there was practically no correlation between the DCR values of the α and δ rhythms. Within
the entire studied group, we found significant negative correlations between the DCRs of the δ and θ activity with the estimates
of some psychological characteristics of the subjects (levels of extroversion, psychoticism, ergicity, plasticity, dominance,
and a few others) measured using the questionnaires RTS (Strelau), EPQ (Eysenck), OST (Rusalov), and 16 PF (Kettel). We also
found positive correlations with the levels of normativity of behavior and development of imagination. At a rather high significance
of such correlations, coefficients of the latter were, as a rule, relatively low (usually less than 0.2). Results of dispersion
analysis showed that significant or close to significant intergroup differences of the mean values of estimates of psychological
characteristics diagnosed according to the above-mentioned questionnaires were typical of the subgroups of subjects with increases
and decreases in the SPs of the δ and θ rhythms or with opposite changes of these indices in the hemispheres. Probable mechanisms
of modulation of the low-frequency EEG components under conditions of the activation reaction and correlations of such changes
with psychological peculiarities of the personality are discussed. |
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Keywords: | |
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