Range of human angle perception thresholds for slow roll motion under two loads
GUO Dalong
ZHOU Yubin
QIN Yufei
SHANG Lamei
TIAN Zhen
TAN Baosen
GUO Zichuan
WANG Cong
Abstract：Objective To investigate the minimum detectable angular deviation between the longitudinal axis of the human body and the G-load direction under different G-load conditions,known as the angle perception threshold(APT).Methods In March-June 2024,18 male volunteers were recruited.Using a subjective visual vertical testing device(eye mask),their APT values were measured for both clockwise and counterclockwise roll tasks under 1.4 Gz and 3.0 Gz load conditions.The mean values were calculated.Results During clockwise rotation,the APT under the 3.0 Gz condition was significantly smaller than that under the 1.4 Gz condition(t=3.567,P=0.002).The case was the same with counterclockwise rotation(t=3.241,P=0.005).Overall,the mean APT under the 3.0 Gz condition was significantly smaller than under the 1.4 Gz condition(t=3.685,P=0.002).Conclusion During roll motion in a human centrifuge cabin,there exists a range of angles that can't be perceived by humans.Within this range,individuals are unable to detect the directional difference between their body's longitudinal axis and the G-load vector.Furthermore,the angle perception threshold slightly decreases as the G-load increases.Under G-loads ranging from 1.4 Gz to 3.0 Gz,the human angle perception threshold is greater than 5 degrees.
Keywords：Roll motionCoriolis effectAngle perception threshold(ATP)
Publication Date：2025-12-25
Online Publishing Date：2026-03-31(First online date of this platform, not the publication date of the document)
Pages：4( 570-573 )