Abstract: Scientific explanations of DéJà Vu fall into 4 categories: dual processing (2 cognitive processes momentarily out of synchrony), neurological ( seizure, disruption in neuronal transmission), memory ( implicit familiarity of unrecognized stimuli), and attentional ( unattended perception followed by attended perception). Each category has its merits and flaws. Some aspects in this fieid need to be psy more attention to in futurt research.