Psycho-Physiological Changes Depend on Differences in the Presentation Ratio of Non-target Stimuli

The purpose of this study was to examine features of attention and concentration based on differences in the amount of unnecessary information using multiple psycho-physiological evaluations. We used the Roken Arousal Scale as a subjective evaluation, and electroencephalograms (alpha attenuation coefficient (AAC), P300) and near-infrared spectroscopy (oxygenated hemoglobin) as physiological indices. To investigate the psycho-physiological differences due to differences in the amount of unnecessary information, we used the oddball paradigm task. As the number of non-target stimuli increased, the oxygenated hemoglobin concentration increased and the P300 amplitude and AAC value tended to decrease. In conclusion, when the amount of unnecessary information is small, the load on the brain and arousal level of decrease are suppressed, and work can be performed while maintaining attention and concentration.