First study tests for markers of stress, through heart rate and cortisol levels, and the findings revealed that browsing for 20 minutes on a smart phone lead to a DECREASE in stress markers.
Oppenheimer S, Bond L, Smith C (2024) Social media does not elicit a physiological stress response as measured by heart rate and salivary cortisol over 20-minute sessions of cell phone use. PLOS ONE 19(4): e0298553. https://doi.org/10.1371/journal.pone.0298553
And also, children who scroll through social media can shape mental models of socially acceptable behaviour in mere hours, rather than years otherwise.
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