Déjà vu can be explained in terms of our neurological activity:

• Spontaneous Brain Activity: When a part of your brain is engaged with memory, thoughts can overlap, and one can experience a false sense of familiarity. The complex memory structures result in cross-connections.
• Neural transmission speed: Déjà vu can be felt when the various parts of one’s brain that transmit information get disrupted, or if the information arrives at different times, like a traffic jam in the brain’s highways.

Déjà vu is French for ‘already seen’. It is a feeling that the situation(or surrounding) is familiar subjectively, but unfamiliar objectively.

Almost two-thirds of individuals have experienced Déjà vu at least once in their lifetime, including blind people.

Déjà vu is a fleeting, intangible experience, making it hard to measure, and is also highly subjective.