In a "human-machine cooperation system" such as a power assist device, it is difficult for a machine to predict human movements, and as a result, the movements of the machine deviate from the human intention, and the originally intended movement is disturbed by the machine. It may end up.
Focusing on this gap between human intention and machine movement, that is, the problem of human perception and timing of machine support, research teams such as the University of Tokyo and Tokyo Institute of Technology conducted experiments using muscle electrical stimulation. rice field.As a result, it was clarified that it is effective to promote the appropriate timing of machine assistance to maintain "perceptual simultaneity" and to promote perceptual adaptation in obtaining "perceptual simultaneity".
In order for machines to provide coordinated support according to human behavior, the timing of voluntary movements based on voluntary intentions (spontaneous movements) and assistive / interventional movements from machines (external operation movements) is one of the user's perceptions. It is important that we do, that is, that perceptual simultaneity is maintained.Therefore, we first tried to identify the time range in which perceptual simultaneity was maintained in the time difference from the start of spontaneous movement to the external manipulation movement.In this experiment, it was found that the rate at which the subject perceived both movements as "simultaneous" reached a peak when the time difference was about 80-160 ms, and a clue was obtained in the time range in which the machine could intervene appropriately.
Next, we examined the adaptation of human perception as a means of facilitating the maintenance of perceptual simultaneity.From this experiment, it was suggested that when the subject was adapted to a specific time width, the time width at which perceptual simultaneity was maintained changed depending on the adapted conditions, and the timing of spontaneous movement and external manipulation movement was suggested. It has been found that perceptual simultaneity can be maintained by applying perceptual adaptation, even if they are different.
This research is expected to provide effective findings for preventing deviations between human intentions and machine movements, and to develop technology for human-machine cooperation systems that can support actions more smoothly in line with human intentions. NS.
Paper information:[PLOS ONE] Perceptual Simultaneity and its Modulation during EMG-Triggered Motion Induction with Electrical Muscle Stimulation
