The focus of this study is a human's ability to make full use of listening and hearing. This ability consists of dividing auditory information into a signal and a noise. To evaluate the risk of using headphones, the study investigated the auditory perception when a warning sound is given in the presence of environmental noise. In an experiment, an event-related potential (P300) was measured in three conditions: 1) not using headphones, 2) using ordinary headphones, and 3) using noise-canceling

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... eadphones. In an outdoor situation, when a subject wearing normal headphones played music at a volume that prevented the hearing of ambient environmental noise (medium volume), the subject was distracted and did not pay full attention to the target stimulus sound, resulting in a great decrease in the subject's ability to distinguish the target stimulus sound from the noise.