Abstract
In the course of a 21-day Dry Immersion (DI), we studied the strength of Ponzo and Müller–Lyer visual illusions with the help of verbal response and two variants of the motor response by means of “tracking” (with the presence and absence of visual feedback). The studies were performed with the participation of ten subjects before the start of DI, on the 3rd, 10th, and 20th day of DI, as well as at the end of it. It was shown that DI mainly affects the motor response. Changes in reducing the strength of visual illusions were more pronounced for a more complex motor task performed in the absence of visual feedback. The results are in agreement with the data that we previously obtained under the conditions of a 5-day DI. One of the possible mechanisms of the observed changes in the illusions estimates may be hyperactivation of the dorsal visual pathway due to gravitational unloading.
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Funding
The development of methods for assessing illusions and data analysis was carried out with the support of the Russian Foundation for Basic Research (project no. 19-013-00036). Organization of immersion studies and participation of E.S. Tomilovskaya were supported by the RAS project (63.1).
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All studies were carried out in accordance with the principles of biomedical ethics formulated in the 1964 Declaration of Helsinki and its subsequent updates, and approved by the local bioethical committee of the Institute for Biomedical Problems RAS (Moscow).
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The authors declare no obvious and potential conflicts of interest related to the publication of this article.
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Each the study participant submitted a voluntary written informed consent signed by him after explaining to him the potential risks and benefits, as well as the nature of the upcoming study.
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Sosnina, I.S., Lyakhovetskii, V.A., Zelenskiy, K.A. et al. The Effect of a 21-Day Dry Immersion on Ponzo and Müller–Lyer Illusions. Hum Physiol 47, 51–59 (2021). https://doi.org/10.1134/S0362119721010138
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DOI: https://doi.org/10.1134/S0362119721010138