We found that participants who multitasked on a laptop during a lecture scored lower on a test compared to those who did not multitask, and participants who were in direct view of a multitasking peer scored lower on a test compared to those who were not. The results demonstrate that multitasking on a laptop poses a significant distraction to both users and fellow students and can be detrimental to comprehension of lecture content.
Worse, the designers of operating systems have every incentive to be arms dealers to the social media firms. Beeps and pings and pop-ups and icons, contemporary interfaces provide an extraordinary array of attention-getting devices, emphasis on “getting.” Humans are incapable of ignoring surprising new information in our visual field, an effect that is strongest when the visual cue is slightly above and beside the area we’re focusing on. (Does that sound like the upper-right corner of a screen near you?)
This effect takes place over more than one time frame — even when multi-tasking doesn’t significantly degrade immediate performance, it can have negative long-term effects on “declarative memory”, the kind of focused recall that lets people characterize and use what they learned from earlier studying. (Multi-tasking thus makes the famous “learned it the day before the test, forgot it the day after” effect even more pernicious.)