In recent research, we investigated whether merely having one’s own smartphone nearby could influence cognitive abilities. In two lab experiments, nearly 800 people completed tasks designed to measure their cognitive capacity. In one task, participants simultaneously completed math problems and memorized random letters.
The results were striking: individuals who completed these tasks while their phones were in another room performed the best, followed by those who left their phones in their pockets. In last place were those whose phones were on their desks. We saw similar results when participants’ phones were turned off: people performed worst when their phones were nearby, and best when they were away in a separate room.
Thus, merely having their smartphones out on the desk led to a small but statistically significant impairment of individuals’ cognitive capacity — on par with effects of lacking sleep. This cognitive capacity is critical for helping us learn, reason, and develop creative ideas.
In this way, even a small effect on cognitive capacity can have a big impact, considering the billions of smartphone owners who have their devices present at countless moments of their lives. This means that in these moments, the mere presence of our smartphones can adversely affect our ability to think and problem-solve — even when we aren’t using them. Even when we aren’t looking at them. Even when they are face-down. And even when they are powered off altogether.