Mind-wandering

Michael Kane, a psychologist at the University of North Carolina at Greensboro, sampled the thoughts of students at eight random times a day for a week. He found that on average, they were not thinking about what they were doing 30 percent of the time.

For some students it was between 80 and 90 percent of the time. Out of the 126 participants, only one denied any mind-wandering at the sampled moments.

Prior work has also turned up average rates of 30 percent to 40 percent in everyday life.

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