Comment on "Wandering minds: The default network and stimulus-independent thought"
Gilbert, S.J., Dumontheil, I., Simons, J.S., Frith, C.D., & Burgess, P.W. (2007). Science, 317, 43.
Mason et al. (Reports, 19 January 2007, p. 393) attributed activity in certain regions of the "resting" brain to the occurrence of mind-wandering. However, previous research has demonstrated the difficulty of distinguishing this type of stimulus-independent thought from stimulus-oriented thought (e.g., watchfulness). Consideration of both possibilities is required to resolve this ambiguity.