When the efference copy is no longer normally generated, then the afferent return from the limb associated with the self-generated movement is mis-perceived as externally produced " ex-afference " since it is no longer correlated with or canceled out by the efference copy.
12.
This may involve an abnormality in the brain mechanism that differentiates between " re-afference " ( i . e ., the return of kinesthetic sensation from the self-generated " active " limb movement ) and " ex-afference " ( i . e ., kinesthetic sensation generated from an externally produced'passive'limb movement in which an active self does not participate ).
13.
This may involve an abnormality in the brain mechanism that differentiates between " re-afference " ( i . e ., the return of kinesthetic sensation from the self-generated " active " limb movement ) and " ex-afference " ( i . e ., kinesthetic sensation generated from an externally produced'passive'limb movement in which an active self does not participate ).
14.
This anomalous situation in which re-afference from a self-generated movement is mistakenly registered as ex-afference due to a failure to generate and successfully transmit an efference copy to sensory cortex, could readily lead to the interpretation that what is in actuality a self-generated movement has been produced by an external force as a result of the failure to develop a sense of agency in association with emergence of the self-generated movement ( see below for a more detailed discussion ).
15.
This anomalous situation in which re-afference from a self-generated movement is mistakenly registered as ex-afference due to a failure to generate and successfully transmit an efference copy to sensory cortex, could readily lead to the interpretation that what is in actuality a self-generated movement has been produced by an external force as a result of the failure to develop a sense of agency in association with emergence of the self-generated movement ( see below for a more detailed discussion ).
16.
As noted above, these ideas can also be linked to the concept of efference copy and " re-afference ", where efference copy is a signal postulated to be directed from premotor cortex ( activated normally in the process associated with emergence of an internally generated movement ) over to somatosensory cortex of the parietal region, in advance of the arrival of the " re-afferent " input generated from the moving limb, that is, the afferent return from the moving limb associated with the self-generated movement produced.
