Key result
Over the course of the experiment, the power of very-low-frequency vasomotor oscillations in neural tissue decreased by 4.34% per hour, while low-frequency oscillations increased by 6.94% per hour.
Why the study?
In intrinsic-signal optical imaging, the mapping signal is obscured by background activity related to spontaneous vasomotor oscillations.
The power of vasomotor oscillations declines faster than their phase stability during intrinsic-signal optical imaging, which can inform methods to minimize background noise in functional brain maps.
Answers are grounded in this paper and cite their sources.
Temporal shifts in neural vasomotor oscillations are hypothesis-generating; clinical relevance and mechanistic implications remain open.
The intrinsic-signal optical imaging is widely used in experimental, theoretical and applied research of the mammal’s brain neocortex functional anatomy. However, a neural activity signal is hidden by the background activity, the amplitude of which is an order of magnitude larger than the mapping signal amplitude. Most of such background activity represents spontaneous oscillations in 0.01–0.15 Hz frequency range related to vasomotor oscillations. In this paper, we point out that such oscillations change their power and phase during the response time course. The most dramatic influence is intrinsic for 0.05–0.15 Hz oscillations. The power of vasomotor oscillations declines more quickly than the stability features of their phase characteristics. Departing from these data, we suggested approaches for minimization of role of vasomotor oscillations in functional maps resulting from intrinsic-signal optical imaging.
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Кожухов et al. (2024) studied Vasomotor oscillations in the visual cortex (n=22). Visual stimulation and experiment duration was evaluated on Relative change in mean power of very-low-frequency (VLF) vasomotor oscillations in neural tissue per hour (p=<0.001). Over the course of the experiment, the power of very-low-frequency vasomotor oscillations in neural tissue decreased by 4.34% per hour, while low-frequency oscillations increased by 6.94% per hour.
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