Exploring the Ecological Validity of Thinking on Demand: Neural Correlates of Elicited vs. Spontaneously Occurring Inner Speech Hurlburt, Russell T. ; Alderson-Day, Ben ; Kühn, Simone ; Fernyhough, Charles Abstract Publication: PLoS ONE Pub Date: February 2016 DOI: 10.1371/journal.pone.0147932 Bibcode: 2016PLoSO..1147932H