The paper explores possible changes of personal identity due to deep brain stimulation (DBS) on the background of a universal problem of combining the persistence through time with the change of an object. It is argued, that in the conception of perdurantism the problem can be resolved without the elimination of identity. Here the identity is put under threat only when the psychological criterion is applied. The application of memory, corporeal or biological criteria means no threat to personal identity of a person undergoing DBS.
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