Multitasking Reduces Productivity by ~40%

Explanation:
Multitasking forces rapid switching between tasks, increasing cognitive load. Rubinstein et al. (2001) found that each switch incurs “switch costs,” reducing accuracy and speed. Chronic multitasking is linked to decreased attention control and poorer memory.

Example:
Switching between writing notes and answering texts slows productivity and increases errors.

Citation:
Rubinstein, J. S., et al. (2001). Executive control of task switching. Journal of Experimental Psychology, 27(4), 763–797.