It is great to see more information coming out concerning multi-tasking. The NYT article delineates the negative consequences of multi-tasking very well.

It is true the brain can be over taxed with too many simultaneous tasks. However, we also need to realize that the subtle and often constant stress of multi-tasking impacts our entire body. To hold our focus and ignore distractions takes extra effort which translates into stress. Holding is tension.

This stress becomes cumulative. We need to realize the longitudinal effects. Each event may be a grain of sand. 100,000 of those events start to carry some weight.