The Grasping Performance Of The Right Hand Will Be Influenced While The Left Hand Has A Gravity Information

Right-hand grasping has been demonstrated for visual-guided grasping. However, people’s sensations are so multiple that the intake of other sensory information will also affect the performance of the individual behavior. MLE model theory puts forward that our brain will automatically integrate redundant information from other sensory channels, and then influence our behavior performance. In what case will the information from other sensory channels be perceived by our brain? Series of experiments were designed to address this question. Experiment 1 and 2 explored whether the performance of the right hand (in grasping and estimating condition) would change with different status of the left hand. The result shows that the performance of the right hand will be influenced when the left hand was grasping an object, the peak aperture of the right hand shows larger while the left hand kept grasping the cube, and the estimating aperture shows smaller while the left hand kept grasping the cube. In order to find out which factor of the tactile information got from the left side would influence the behavior of the right side, experiment 3 investigated the performance of the right hand when the left hand was pinching an object. The result indicates that the performance of the right hand is not affected. We compared experimentl and 3, and we believe that the difference between grasping objects and pinching objects is the factor of gravity. So, in experiment 4, we asked participants to hold cubes with their fingertips. As we supposed, when participants hold an object with their fingertips of the left hand, their grasping performance of the right hand will be influenced, whose result is similar with the condition while the left hand was grasping a cube. Surprisingly, the size information got from the left hand doesn’t have any impact on the performance of the right hand.In other words, the vision is the main pathway to get the size information. All in all, these findings suggest that the performance of grasping is guided by vision. When the information from visual is believable, our brain wouldn’t integrate tactile information to make decision. In addition, the size of the grip aperture of the left hand doesn’t influence the aperture of the right hand, the size of the object on the right part is the important clue for our action. If non-relevant information in non-relevant tasks includes an obvious gravity information, our attention will then be influenced, which will ultimately influence the performance of behavior. Although the participants realize the behavior is different between the left and right hand, the factor of gravity from the left hand is still influencing the performance of the right hand. By the way, the estimating and grasping performance of the right hand were different in the same condition when the left hand was grasping something, and it is also in line with two visual systems.