Influence of Dry Immersion on the Characteristics of Cyclic Precise Hand Movements

Lyakhovetskii, Vsevolod; Zelenskaya, Inna; Karpinskaya, V. Yu.; Bekreneva, Maria; Zelenskiy, K. A.; Tomilovskaya, Elena

doi:10.1134/s0362119722600291

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…Simulated or real microgravity also leads to hypermetria. Hypermetric cyclic arm movements were observed in 6 h and 5 days DI ( Lyakhovetskii et al, 2022 ); hypometric pointing arm movements became hypermetric during spaceflight ( Tomilovskaya and Kozlovskaya, 2012 ).…”

Section: Discussionmentioning

confidence: 99%

Perception of length and orientation in dry immersion

Lyakhovetskii

Chetverikov

Zelenskaya

et al. 2023

Front. Neural Circuits

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IntroductionHow does gravity (or lack thereof) affect sensory-motor processing? We analyze sensorimotor estimation dynamics for line segments with varying direction (orientation) in a 7-day dry immersion (DI), a ground-based model of gravitational unloading.MethodsThe measurements were carried out before the start of the DI, on the first, third, fifth and seventh days of the DI, and after its completion. At the memorization stage, the volunteers led the leading hand along the visible segment on a touchscreen display, and at the reproduction stage they repeated this movement on an empty screen. A control group followed the same procedure without DI.ResultsBoth in the DI and control groups, when memorizing, the overall error in estimating the lengths and directions of the segments was small and did not have pronounced dynamics; when reproducing, an oblique effect (higher variability of responses to oblique orientations compared to cardinal ones) was obtained. We then separated biases (systematic error) and uncertainty (random error) in subjects’ responses. At the same time, two opposite trends were more pronounced in the DI group during the DI. On the one hand the cardinal bias (a repulsion of orientation estimates away from cardinal axes) and, to a small extent, the variability of direction estimates decreased. On the other hand, the overestimation bias in length estimates increased.DiscussionSuch error pattern strongly supports the hypotheses of the vector encoding, in which the direction and length of the planned movement are encoded independently of each other when the DI disrupts primarily the movement length encoding.

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Section: Discussionmentioning

confidence: 99%

Perception of length and orientation in dry immersion

Lyakhovetskii

Chetverikov

Zelenskaya

et al. 2023

Front. Neural Circuits

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Perception of Length and Direction in Wave Motion

Lyakhovetsky,

Skotnikova,

Karpinskaya

2024

Experimental Psychology (Russia)

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<p>It is known that changes in the functioning of the vestibular system affect visual perception. We studied the effect of gravitoinertial impact on the sensorimotor assessment of the length and direction of segments of different orientations by the leading hand before and during the wave motion (n = 6) in comparison with the control group (n = 22). At the memorization stage, the subjects moved their leading hand along a visible segment located at different angles to the horizontal on the center of the touchscreen, and at the reproduction stage they repeated this movement in the same place on an empty screen. In both groups, when memorizing, the error in estimating the length and direction of segments was small and had no pronounced dynamics; during reproduction, a motor oblique effect was obtained, that is repulsion of segments of oblique directions from the canonical axes, vertical and horizontal. During wave motion, the length of the segment began to be estimated less accurately (movements became more hypermetric). This error pattern supports the vector encoding hypothesis, in which the direction and length of the planned movement are encoded independently of each other. Moreover, the gravitoinertial effect selectively affects the accuracy of length coding, and not the coding of the direction of movement of the leading hand.</p>

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The Effect of Dry Immersion on the Characteristics of Joystick Control during the Performance of a Visual-Motor Task in Men and Women

Miller,

Zobova,

Badakva

2024

Fiziologiâ čeloveka

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A study of the effect of Dry Immersion (DI) on the characteristics of joystick control during a visual-motor task in men and women was conducted. It is shown that in the first days of DI there is a deterioration in the performance of the visual-motor task – an increase in time indicators and a decrease in movement accuracy. By the end of DI, most of the parameters returned to the control level indicating the adaptation of the hand movement control mechanisms to immersion conditions. However, despite the similarity of the effect of DI on changes in the parameters of movement trajectories in men and women, it was shown that both in control and in DI, women performed the presented visual-motor task faster and more accurately due to a longer latency time. In the early days of DI, the characteristics of task performance in women changed less than in men, which indicated a better adaptation of women to the conditions of DI. In the process of adaptation to DI factors, men and women had different strategies for performing visual-motor tasks.

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Influence of Dry Immersion on the Characteristics of Cyclic Precise Hand Movements

Cited by 3 publications

References 29 publications

Perception of length and orientation in dry immersion

Perception of length and orientation in dry immersion

Perception of Length and Direction in Wave Motion

The Effect of Dry Immersion on the Characteristics of Joystick Control during the Performance of a Visual-Motor Task in Men and Women

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