TY - JOUR

T1 - Perception of length and orientation in dry immersion

AU - Ляховецкий, Всеволод Александрович

AU - Четвериков, Андрей Анатольевич

AU - Зеленская, Инна Сергеевна

AU - Томиловская, Елена Сергеевна

AU - Карпинская, Валерия Юльевна

N1 - Lyakhovetskii V, Chetverikov A, Zelenskaya I, Tomilovskaya E and Karpinskaia V (2023) Perception of length and orientation in dry immersion. Front. Neural Circuits 17:1157228.

PY - 2023/4/12

Y1 - 2023/4/12

N2 - INTRODUCTION: How 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.METHODS: The 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.RESULTS: Both 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.DISCUSSION: Such 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.

AB - INTRODUCTION: How 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.METHODS: The 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.RESULTS: Both 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.DISCUSSION: Such 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.

KW - Humans

KW - Immersion

KW - Movement/physiology

KW - Orientation/physiology

KW - Perception

KW - Sensation

KW - visuomotor processing

KW - orientation

KW - hypermetria

KW - dry immersion (DI)

KW - motor oblique effect

UR - https://www.mendeley.com/catalogue/4ba663ab-ed2d-3030-aefc-ac023f5096e9/

U2 - 10.3389/fncir.2023.1157228

DO - 10.3389/fncir.2023.1157228

M3 - Article

C2 - 37123106

VL - 17

JO - Frontiers in Neural Circuits

JF - Frontiers in Neural Circuits

SN - 1662-5110

M1 - 1157228

ER -