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
Moving Forward »Moving Forward
What research should we do? »What research should we do?
Potential areas of research »Potential areas of research
Consciousness Studies »Consciousness Studies
Voice Hearing »Voice Hearing
How are voices generated? »How are voices generated?
Are the voices separate consciousnesses? »Are the voices separate consciousnesses?
No.
Where's the evidence? »Where's the evidence?
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