Dastjerdi, M., Foster, B. L., Nasrullah, S., Rauschecker, A. M., Dougherty, R. F., Townsend, J. D., Chang, C., Greicius, M. D., Menon, V., Kennedy, D. P., & Parvizi, J. (2011). Differential electrophysiological response during rest, self-referential, and non-self-referential tasks in human posteromedial cortex. Proceedings of the National Academy Of Sciences, 108(7), 3023-3028. doi:10.1073/pnas.1017098108
This study examined activation in the human posteromedial cortex, a region of the brain also called the “default mode network.” Electrophysiological measurements of the DMN during rest and while thinking about oneself were used and it was found that different regions of the DMN were activated during rest vs. during thoughts about the self. This region is activated during rest as well as during thoughts about oneself and is de-activated during activity directed outward. Researchers have speculated that its activation during rest signifies activation of thoughts about oneself during rest.