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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Human Physiology</journal-id><journal-title-group><journal-title xml:lang="en">Human Physiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Физиология человека</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0131-1646</issn><issn publication-format="electronic">3034-6150</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">684019</article-id><article-id pub-id-type="doi">10.31857/S0131164625030014</article-id><article-id pub-id-type="edn">TSKLKN</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Resting-state gamma-band activity at clinical high risk for schizophrenia: correlation with clinical measures and levels of GABA and glutamate in frontal lobes</article-title><trans-title-group xml:lang="ru"><trans-title>Гамма-ритм покоя при клинически высоком риске манифестации шизофрении: корреляции с клиническими показателями и уровнем ГАМК и глутамата в лобных отделах</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lebedeva</surname><given-names>I. S.</given-names></name><name xml:lang="ru"><surname>Лебедева</surname><given-names>И. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alexander.tomyshev@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tomyshev</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Томышев</surname><given-names>А. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alexander.tomyshev@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Omelchenko</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Омельченко</surname><given-names>М. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alexander.tomyshev@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ublinskiy</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Ублинский</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alexander.tomyshev@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Akhadov</surname><given-names>T. A.</given-names></name><name xml:lang="ru"><surname>Ахадов</surname><given-names>Т. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alexander.tomyshev@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kaleda</surname><given-names>V. G.</given-names></name><name xml:lang="ru"><surname>Каледа</surname><given-names>В. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>alexander.tomyshev@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Mental Health Research Center</institution></aff><aff><institution xml:lang="ru">ФГБНУ Научный центр психического здоровья</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Children's Clinical and Research Institute of Emergency Surgery and Trauma of Moscow Healthcare Department</institution></aff><aff><institution xml:lang="ru">НИИ неотложной детской хирургии и травматологии ДЗ г. Москвы</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-07-04" publication-format="electronic"><day>04</day><month>07</month><year>2025</year></pub-date><volume>51</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>3</fpage><lpage>13</lpage><history><date date-type="received" iso-8601-date="2025-06-12"><day>12</day><month>06</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-12"><day>12</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0131-1646/article/view/684019">https://journals.eco-vector.com/0131-1646/article/view/684019</self-uri><abstract xml:lang="en"><p>Gamma-band abnormalities are consistently reported in schizophrenia and attributed to disturbances of the excitation-inhibition balance in the brain. However, results in clinical high-risk groups are rare and quite inconsistent. The aim of the present study was to determine the characteristics of the resting-state gamma-band activity (range 30–45 Hz) in the clinical high-risk group (CHR, 110 patients) in comparison with schizophrenia patients (66 patients) and mentally healthy (62 subjects) male individuals. Correlation analysis with clinical characteristics were also conducted, and comparisons were made between patients who did or did not convert to psychosis during catamnestic follow-up. Correlations of gamma-band spectral power with gamma-aminobutyric acid (GABA) concentration and glutamine+glutamate index (GLX in frontal lobes were also analyzed. Statistically significant differences in gamma-band spectral power were revealed only between the CHR group and schizophrenia patients. In CHR patients GABA levels were decreased compared to healthy controls in the left frontal lobe, however there were no correlations between GABA and gamma-band spectral power. The results suggest some degree of “normality” or “compensation” of the processes of gamma-band activity generation (30–40 Hz) at clinical high risk of schizophrenia.</p></abstract><trans-abstract xml:lang="ru"><p>Аномалии γ-ритма устойчиво регистрируются при шизофрении, что связывают с нарушением баланса возбуждения-торможения в головном мозге. Данные в группах высокого клинического риска, однако, единичны и достаточно противоречивы. Целью настоящей работы были определение особенностей γ-ритма покоя (диапазон 30–45 Гц) в группе клинического риска (КВР, 110 пациентов) по сравнению с больными шизофренией (66) и психически здоровыми (62 испытуемых) мужчинами. Также проводили анализ корреляций с клиническими характеристиками и сопоставление между пациентами, у которых во время катамнестического наблюдения наблюдалась или отсутствовала манифестация психоза. Отдельный фрагмент работы был связан с анализом корреляций спектральной мощности γ-ритма с концентрацией γ-аминомасляной кислоты (ГАМК) и показателя глутамат + глутамин (GLX) в лобных отделах головного мозга. Статистически значимые отличия в мощности γ-ритма были обнаружены только между группой КВР и больными шизофренией. В группе клинического риска было подтверждено статистически значимое снижение уровня ГАМК в левой лобной области по сравнению с группой психически здорового контроля, однако корреляций между этим биохимическим показателем и спектральной мощностью γ-ритма выявлено не было. Результаты предполагают определенную «сохранность» или «скомпенсированность» процессов генерации ритма частотой 30–40 Гц при клинически высоком риске манифестации шизофрении.</p></trans-abstract><kwd-group xml:lang="en"><kwd>gamma-band</kwd><kwd>clinical high risk</kwd><kwd>schizophrenia</kwd><kwd>GABA</kwd><kwd>GLX</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>γ-ритм</kwd><kwd>клинически высокий риск</kwd><kwd>шизофрения</kwd><kwd>ГАМК</kwd><kwd>глутамат + глутамин</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>22-15-00437</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Strelets V.B., Garakh J.V., Korsakova N.K. et al. 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