Figure 2. Remembering, thinking about the future, navigation, and theory of mind activate the default network. Images from a meta-analysis of tasks that require individuals to mentally project themselves into an alternative setting.¹⁰ Red and yellow represent overlap of at least two forms of task. The meta-analysis reveals that nodes of the default network are active during many forms of task where the participants must construct mental models of personally significant events. Differences do exist between task forms that are not emphasized by this display. One hypothesis is that the default network is important to many forms of active cognition but was serendipitously discovered during passive task states in the early years of human neuroimaging.¹¹ Adapted from ref 10: Spreng RN, Mar RA, Kim AS. The common neural basis of autobiographical memory, prospection, navigation, theory of mind, and the default mode: a quantitative meta-analysis. J Cogn Neurosci. 2009;21:489-510. Copyright © MIT Press 1997.