From a neurological point of view -- quite possibly yes. In that, as one becomes fluent in new language, different centers of the brain (perhaps entirely diffe

From a neurological point of view -- quite possibly yes. In that, as one becomes fluent in new language, different centers of the brain (perhaps entirely different from those used for developing one's mother tongue) are activity. And literally new brain tissue grows in these regions. So when these newer centers are activated... in part, it's literally a different "you" that's being engaged. Just another among the many side benefits of becoming bilingual.