Sensory brain areas are usually characterized by their responses to external stimuli; however, neuroimaging studies have now shown that activation of auditory cortex occurs spontaneously and can be induced during silence by stimulus expectancy or mental imagery. © 2006 Elsevier Ltd. All rights reserved.
King, A. J. (2006, June). Auditory Neuroscience: Activating the Cortex without Sound. Current Biology. https://doi.org/10.1016/j.cub.2006.05.012