Psychophysiological Correlates of Light-and-Shade Gradation Assessment on the Specific Form

Introduction. The article deals with bioelectrical activity of the cerebral cortex in the light-and-shade assessment process on the specific form. The need for constant improvement in professional art teaching methods justifies the urgency of the study. Visual perception plays a special role in the life of the person. We will describe and analyze modern psychophysiological studies regarding this mechanism. These studies highlight the great importance of brightness and illumination of the stimulus.Purpose. In our article, we will identify psychophysiological characteristics that affect light-and-shade gradations assessment on the specific form.Materials and Methods. The experiment involved 22 participants. Of them, 11 have experience with artistic activity and 11 do not. In the study, we used: the questionnaire method, the electroencephalography method (EEG), and the methods of mathematical statistics. The significance of differences in the EEG power spectrum was studied with the one-way analysis of variance (ANOVA).Results. Data on the subjects' answers accuracy are provided. Participants with artistic activity experience answered correctly 25% of the time. Those without stated experience were correct 22% of the time. No differences in significance were found. The comparative analysis results of the average power indicators of alpha, beta, gamma, theta, and delta ranges are presented. Indicators of main EEG rhythms power in light-and-shade gradations assessment in the experimental and control groups have differences.Discussion. We considered the relationship of rhythm power changes and cognitive processes. We described found differences regarding bioelectrical activity of the cerebral cortex in the light-and-shade gradations assessing in participants with and without artistic activity experience. The data obtained allow us to state that in the participants from the experimental and control groups various cortex areas were activated while assessing light-and-shade gradations. While performing a task, the artist's frontal and temporal areas of the right hemisphere activate most of the time.