When we multi-task, we are ...

When we multi-task, we are motivated by a desire to be more productive and more efficient. We're often doing things that are automatic, that require very little cognitive processing... Continuous partial attention describes how many of us use our attention today... to pay partial attention - continuously. It is different from multi-tasking.
 Linda Stone

Quotes from the same author

It's no accident that new ideas pop into our heads when we least expect it. In our enthusiasm to be productive, we forget to give our mind/body moments to be "receptive" - that is, open to daydreaming, open to letting our minds wander.
 Linda Stone