Ability to recognize and identify the location of vibration stimulation on the fingers

To investigate the tactile numerosity judgments and position report by simultaneously presenting, we asked human subjects to answer the number and the location of eight vibrations presented to different fingertips on right hand. In numerosity judgments task, we found that the accuracy of participants' responses decreased as the number of stimuli activated was increased. And as the more stimulus presentation, the answer is smaller than the correct answer. In position report task, we found that index finger has higher accuracy of vibrotactile discrimination than the other fingers. Moreover, the sensitivity of distal phalanx part is higher than middle phalanx.