What is the Voluntary Response Error?

Hey guys. I am preparing for my mid-term examination. Can you help me on the Voluntary Response Error.
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" Voluntary response erroroccurs when a survey is not conducted on a randomly selected sample but a questionnaire is published in a magazine or newspaper and people are invited to respond to that questionnaire."
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"Any neurological system reception that is manageable in the brain, and therefore involves prime(a). "
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