What Our Internal Voices Say About Ourselves.
Most of us have moments when we catch ourselves talking to ourselves, or more likely, others catching us talking to apparently no one, or perhaps thinking silently to ourselves. Psychologists call this phenomenon “inner speech,” and they have been trying to study it as a scientific discipline. We have known that inner speech is accompanied by tiny muscular movements in the larynx, detectable by an electromyography. In the 1990s, neuroscientists used functional neuroimaging to demonstrate that areas such as the left inferior frontal gyrus or the Broca’s area, which are active when we speak out loud, are also active during inner speech. Furthermore, disrupting the activity of this region using brain stimulation techniques can interrupt both outer and inner speech. This article walks us through scientific findings to date.
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