The Correlation Study Of Eye Movement,Finger Pressure And Accuracy Based On Fitts Experiment

In the target-directed movements,as the moving speed increases,the spatial accuracy decreases,and as the requirement for accuracy increases,the movement becomes slower,this phenomenon is called speed and accuracy trade-off.In the study of human motor control,Woodworth’s two-component model of upper limb motor control and Fitts’ human motion task model have important theoretical guiding significance for the study of the relationship between the speed and accuracy of target-directed movements.At present,there have been a lot of theoretical frameworks and experimental studies on the relationship between the speed and accuracy of limb pointing and the eye-hand coupling during the period.However,it is unknown whether the same conclusion is applicable to the target pointing task of finger force control.From the perspective of motor control,based on Woodworth’s two-component model and Fitts’ reciprocal tapping experiment as the theoretical basis,designed a continuous "virtual target-directed movement" task of finger force control,aiming to explore the influence of different difficulty index(ID)and movement time(T)on the accuracy of finger force control and visual control,as well as observe the eye movement characteristics and eye-hand coordination mode during the experiment.In this paper,20 right-handed college students are selected as the research object of this experiment.The subjects are required to press the sensor with the index finger to reach the set target under 3 kinds of difficulty index(ID)and 3 kinds of movement time(T).The force value makes the cursor in the operation interface reach the target position.Comprehensively use the independently developed finger force test system and eye movement recording technology to simultaneously record the changes in finger force,eye movement and accuracy under different experimental conditions.The analysis results are as follows:1.The accuracy of finger force control and visual control are both affected by the movement time(T)and difficulty index(ID),and the change trends of the two are consistent.As the movement time(T)decreases,the speed increases,the accuracy decreases.However,the ID has different effects on the two stages.In the stage from the starting target position to the ending target position,as the ID increases,the accuracy decreases,while the target from the end.In the stage when the position returns to the starting target position,as the ID increases,the control of vision and finger force is more accurate.2.The experimental results show that the subjects combined fixation,saccade and smooth tracking to optimize the acquisition of visual information.The eye movement changes during the experiment showed a certain regularity.But the eye movement changes in the two stages of "go" and "back" are not symmetrical.3.Under this experimental condition,there is a specific time coupling relationship between the eye movement system and the finger force control system,but there are differences in the coordination mode of the eye(gaze point)and hand(cursor)between the two stages of "go" and "back".4.Under different experimental conditions,the accuracy of the visual control of the starting target position and the finger force control are higher than the end position.The difference between the eye-hand coordination modes of "go" and "back" results in different percentages of visual and proprioceptive information in the process of motor control,which affects the precise control of the finger perception at the end position.Based on the above experimental results,a preliminary conclusion can be drawn: the force-controlled continuous "virtual target pointing" task studied in this paper is related to Woodworth’s original experiment and Fitts’ task,but there are differences.Both are affected by movement time(T)and difficulty index(ID),as well as the eye-hand coordination control mode at the stage from the starting target position to the ending target position are similar.