From what I found after a brief research, the brain likes to fill in gaps in hearing in order to keep focused or to prevent disruptive silence. People with obsessive compulsive disorder seem to tend to be more prone to these earworms, which is in line of why most individuals do this situationally, mostly to not get distracted or sidetracked. What process is happening, is the brain’s auditory cortex is playing a short-term loop involuntarily. Brain hear sound, brain repeat sound, because sound feel.
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