Although scientists struggle to define it, take a look at 3 theories which explore the possible causes for déjà vu.
Vocabulary
Neuroimaging - "The neuroimaging results showed abnormal activity in the patient's brain.”
Cognitive - "The cognitive assessment revealed deficits in memory and attention.
Peripheral - "I caught a glimpse of the peripheral details of the painting while focusing on the center.”
Flurry - "The store was in a flurry of activity as shoppers rushed in for the sale.”
Recollection - "She struggled to recall the events of the previous night, despite her best recollection efforts.”
Conclusive - "The conclusive evidence proved the defendant's innocence.”
Phenomenon - "The northern lights are a natural phenomenon that can be seen in the night sky.”
Asserts - "The attorney asserts that the witness' testimony is unreliable.”
Summons - "The judge summoned the jury to deliberate on the case.”
Fleeting - "The fleeting moment of happiness was gone as quickly as it had come.”
Source: TedEd