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'Divided attention had no impact on day-to-day performance and students could accurately recall what happened in class that day even if they were using a cell-phone or laptop. But the use of a device had a significant impact on long-term retention, a consequence Glass sees as more "insidious" because it happens over time.'
insidehighered.com

In-class cellphone and laptop use lowers exam scores, a new study shows

Yes, cellphones and laptops do affect students' grades, and no, students can't multitask as well as they say they can. Arnold Glass …