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Your search keyword '"Portnova, Galina"' showing total 186 results
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186 results on '"Portnova, Galina"'

11. Development of EEG Response to Unpleasant, Pleasant, and Neutral Tactile Stimuli.

Author

Portnova, Galina and Mayorova, Larisa

Subjects
*SCHOOL children, *FRACTAL dimensions, *PRESCHOOL children, *CHILD development, *ELECTROENCEPHALOGRAPHY
Abstract

Background: The study of tactile perception during a childhood is extremely important for understanding the social and communicative aspects of the child's development. Tactile perception of stimuli with different valence can have different normative stages of development. Methods: In the present study, we examined changes in linear and nonlinear electroencephalogram (EEG) parameters during the presentation of pleasant (C-tactile optimal stroking), unpleasant (ice stroking), and neutral tactile stimuli in three groups of healthy volunteers: preschoolers 4 and 5 years, school-age children from 8 to 10 years, and adults from 20 to 40 years. Results: According to our findings, child maturation plays a significant role in the perception of pleasant and neutral tactile stimuli. Patterns of EEG dynamics related to tactile perception showed greater similarity between adult volunteers and school-aged children than preschoolers. Conclusions: Non-linear EEG parameters such as fractal dimension (FD), envelope mean frequency (EMF), and power spectral density (PSD) dynamics of the theta-rhythm were particularly sensitive to developmental changes in tactile perception. Hjorth complexity and peak alpha frequency (PAF) scores may serve as indicators of mature perception of C-tactile (CT)-stimuli. [ABSTRACT FROM AUTHOR]

Published
2024
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34. Acoustic and Subjective Basis of Emotional Perception in Comatose Patients: A Comparative Study.

Author

Portnova, Galina V. and Proskurnina, Elena V.

Subjects
*PATIENTS' attitudes, *ACOUSTIC stimulation, *EVOKED potentials (Electrophysiology), *AUDITORY perception, *EMOTIONAL conditioning, *SUBLIMINAL perception, *ELECTROENCEPHALOGRAPHY, *TRANSCRANIAL direct current stimulation, *AFFECTIVE neuroscience
Abstract

Objective: The acoustic stimulation in consciousness patients may improve the diagnosis assessment and the effectiveness of rehabilitation procedures. We aimed to investigate the event-related potential (ERP) response to emotional auditory stimuli in comatose patients. Methods: We measured the nonlinear and linear electroencephalogram (EEG) features, prepared the acoustic analysis of stimuli parameters, and assessed the subjective emotional rates of stimuli characteristics. Results: Patients with better outcomes had recognizable ERP responses and significant changes of the nonlinear EEG features to emotional sounds, unlike patients with worse outcomes. The response of comatose patients was attributed to acoustical features of emotional sounds, whereas the EEG response of healthy subjects was associated with their subjective feelings. The comatose patients demonstrated the variable EEG activity for neutral and emotional sounds. Conclusion: Thus, the EEG reactivity followed the better outcome of comatose patients to emotional stimuli. The study assumed the substantial differences of emotional stimuli perception in the healthy and unconscious brain. [ABSTRACT FROM AUTHOR]

Published
2023
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