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<p>Intrinsic signal optical imaging is widely used in experimental, theoretical, and applied studies of the functional anatomy of the mammalian cerebral cortex. However, recorded signals correlating with neuronal activity are masked by background activity, which can be an order of magnitude stronger than the imaging signal. Most background activity consists of spontaneous oscillations with frequencies of 0.01–0.15 Hz, which are termed vasomotor oscillations. The work reported here shows that these oscillations change during experiments. Oscillations in the frequency range 0.05–0.15 Hz are more affected. In this situation, the power of vasomotor oscillations decreases more significantly than measures of the stability of their phase characteristics. The present paper discusses methodological approaches to minimizing the influence of vasomotor oscillations on functional maps constructed by the optical imaging method.</p>

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Dependence of Amplitude and Phase Characteristics of Vasomotor Oscillations on the Visual Stimulation Conditions and Experiment Duration

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • S. A. Kozhukhov,
  • K. A. Saltykov,
  • I. V. Bondar

摘要

Intrinsic signal optical imaging is widely used in experimental, theoretical, and applied studies of the functional anatomy of the mammalian cerebral cortex. However, recorded signals correlating with neuronal activity are masked by background activity, which can be an order of magnitude stronger than the imaging signal. Most background activity consists of spontaneous oscillations with frequencies of 0.01–0.15 Hz, which are termed vasomotor oscillations. The work reported here shows that these oscillations change during experiments. Oscillations in the frequency range 0.05–0.15 Hz are more affected. In this situation, the power of vasomotor oscillations decreases more significantly than measures of the stability of their phase characteristics. The present paper discusses methodological approaches to minimizing the influence of vasomotor oscillations on functional maps constructed by the optical imaging method.