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Psychologist Discovers Visible Smartphone Alone Reduces Cognitive Performance Even When Not Used

By Egleze Editorial Desk · Published May 29, 2026 · Lewis Howes School of Greatness · The Science of Doing Less to Achieve More | David Epstein
Psychologist Discovers Visible Smartphone Alone Reduces Cognitive Performance Even When Not Used
Lewis Howes School of Greatness
Lewis Howes School of Greatness
The Science of Doing Less to Achieve More | David Epstein

What was said

"There are now studies showing that if you have a phone visible, you'll do worse on cognitive tests if it's visible, even if you can't use it. And the more phone-dependent you are, the greater that deficit is."

New research cited by Epstein shows that merely having a smartphone visible during cognitive tasks reduces performance, even when the phone cannot be used. The effect is stronger for people who are more phone-dependent. This builds on psychologist Gloria Mark's finding that people become accustomed to a certain level of distraction and will self-interrupt with intrusive thoughts at the same cadence even when trying to focus.

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Attributed speaker claim

Egleze verified who said this and where. The underlying claim has not been independently established by Egleze.

Source and context

Egleze verified who said this and where. The underlying claim has not been independently established by Egleze.

Programme
Lewis Howes School of Greatness
Episode
The Science of Doing Less to Achieve More | David Epstein
Clip time
1:06:11
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Lewis Howes School of Greatness
Lewis Howes School of Greatness

The Science of Doing Less to Achieve More | David Epstein

May 25, 2026 · 5 Egleze moments
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