In Nurture Your Inner Slacker, I suggested a connection between multitasking and the lack of available time for complex thinking. To summarize:
Many people respond to information overload and task overload by multitasking.
As a result, due to to (a) taking on too many urgent matters (in lieu of more important matters), and (b) the natural inefficiency of multitasking, these people effectively squeeze time for reflection and creative thinking out of their schedule.

Today, in Creating Passionate Users, Kathy Sierra really piles on the evidence against multitasking.

Link: Multitasking makes us stupid?