No.
They are internally generated.

See the Hearing Voices Network for work in this area. 

CONTEXT(Help)
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ISPS-US Moving Forward Map »ISPS-US Moving Forward Map
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Moving Forward »Moving Forward
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What research should we do? »What research should we do?
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Potential areas of research »Potential areas of research
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Consciousness Studies »Consciousness Studies
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Voice Hearing »Voice Hearing
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How are voices generated? »How are voices generated?
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Are the voices separate consciousnesses? »Are the voices separate consciousnesses?
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No.
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Where's the evidence? »Where's the evidence?
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