¹⁶(Klinger, 2013). His theory actually considers “spontaneous thoughts” which are more general than wandering thoughts. It further includes the interesting idea that wandering thoughts may not be just triggered when the computational capacity would be idle otherwise, but they could also be triggered when there is a goal, perhaps with an intention or commitment to it, but it is not currently possible to actually perform any meaningful action to reach the goal. Then, planning to reach that goal may be triggered involuntarily and lead to wandering thoughts.