| Motion has two basic attributes including the motion speed and the motion direction.Accurate judgement of the motion speed and motion direction is one of necessary skills for human survival.Vehicle collision monitoring and prediction in the field of traffic safety,throwing,interception and shooting in the field of sports training,and even the simple grasp of objects in daily life,all need the judgement of the motion speed and motion direction.Previous studies have found that the accuracy of motion speed judgement in two-dimensional plane is different between motion directions,and is affected by the magnitude of motion speed,occluded distance,gravity conditions and other factors.The main purpose of this study is to explore whether there has direction effect on motion direction judgement of moving objects in two-dimensional plane,and its manifestation.And we further explore the possible influence factors from the external gravity conditions and the elements of motion like motion speed,occluded distance,etc.This study consists of three parts.In the first experiment,we try to explore whether the direction effect of motion direction judgement exists and its possible manifestation.Compare the judgement performance of upward,downward,leftward and rightward motion.In the second experiment,we aim to find out the influence of weightlessness on the direction effect of motion direction judgement,comparing the judgement performance of upward,downward,leftward and rightward motion under different gravity conditions.In the third experiment we research the influence of different motion factors on the direction effect of motion direction judgement,comparing the judgement performance of upward,downward,leftward and rightward motion under different motion speed and occluded distance.The main conclusions of this study are as follows:(1)There has direction effect on motion direction judgement in two-dimensional plane.Deviation of downward motion judgement always larger than upward motion.(2)Whether there has direction effect and its manifestation is independent of gravity conditions,motion speed and occluded distance.(3)Gravity conditions,motion speed and occluded distance have not an effect on direction effect,but they have an effect on direction judgement deviation.Gravity conditions have a significant effect on vertical motion direction judgement.Judgement deviation of upward motion is larger under simulated weightlessness condition than natural gravity condition.In a certain range,the deviation of motion direction judgement increases with the increase of motion speed and occluded distance. |
