"A smartphone can tax its user’s cognition simply by sitting next to them on a table, or being anywhere in the same room with them, suggests a study published recently in the Journal of the Association for Consumer Research. It finds that a smartphone can demand its user’s attention even when the person isn’t using it or consciously thinking about it. Even if a phone’s out of sight in a bag, even if it’s set to silent, even if it’s powered off, its mere presence will reduce someone’s working memory and problem-solving skills."
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