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I-functions and corollary discharges
To perhaps address the question of the I-function in this case, it is this particular lack of corollary discharges that allows for someone to believe that they are hearing voices. Part of our understanding of the I-function is that it all depends on whether or not the "cable" is connected from one area of our body where the sensory input occurs to the head where a speech output is generated. Similarly since corollary discharges are signals that transmit information to the brain that in turn generate a response, any disruption with the normal activity of corollary discharges has consequences on the I-function; in the case of schizophrenia, one would claim to hear voices, when someone who does not suffer from the disorder would have normal corollary discharge activity and consequently does not have the same claim.