Momentary interruptions can derail the train of thought.

  title={Momentary interruptions can derail the train of thought.},
  author={Erik M. Altmann and J. Gregory Trafton and David Z. Hambrick},
  journal={Journal of experimental psychology. General},
  volume={143 1},
We investigated the effect of short interruptions on performance of a task that required participants to maintain their place in a sequence of steps each with their own performance requirements. Interruptions averaging 4.4 s long tripled the rate of sequence errors on post-interruption trials relative to baseline trials. Interruptions averaging 2.8 s long--about the time to perform a step in the interrupted task--doubled the rate of sequence errors. Nonsequence errors showed no interruption… 

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Advance Preparation in Task Switching
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