Statistical Anaylsis of Human Grasping
Statistical Anaylsis of Human Grasping
As the size of the object increases, so does the number of fingers used to grasp the object. The preferred grasp for the marble was the same as the minimum, and close to the number of maximum fingers used. Two fingers was the mean for the preferred and minimum and the maximum was 2.5 with a standard deviation of .2. The mean of the preferred grasp of the golf ball was 2.7 fingers, with a standard deviation of .2. It was above the minimum number of fingers used, which was 2, and below the mean of the maximum grasp, which was 3.8 with a standard deviation of .3. The mean of the preferred grasp of the tennis ball was 3.5 with standard deviation of .3. Two was the minimum grasp of the tennis ball, while the maximum grasp was 4.2 with a standard deviation of .3. The preferred grasp of the softball was 4.5 with a standard deviation of .2, which is double the mean of the minimum grasp, which was 2.2 with a standard deviation of .2. However, the mean of the preferred grasp is close to the maximum grasp, which was 5. The grasp of the basketball is unique in comparison to the other objects. It had no deviation in the grasps for any of the subjects tested. The mean of the preferred and the maximum grasps were the same, being 10 fingers, and the minimum grasp was 6 fingers.
The preferred grasp for the smallest sphere, the marble, was the same as the minimum, both being 2 fingers. For the largest sphere, the basketball, the preferred grasp was the same as the maximum grasp, both being 10 fingers. For the other three balls, the preferred grip was in between the minimum and maximum grips. The preferred grasp for the golf ball was closer to the minimum grasp than the maximum grasp. The preferred grasp for the tennis ball was closer to the maximum grasp than to the minimum grasp, and the preferred grasp for the softball was also closer to the maximum grasp than to the minimum grasp. For the previous 3 objects, the subjects did not use the maximum or minimum number of fingers used because it was more natural...