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experiments have shown that the human brain can only distinguish two individual visual events with respect to time if they occur more than 25 milliseconds apart. (8) So if a person has an optical signal path impairment which results in the image from one eye coming after the other with more than 25 milliseconds, then the brain can think that they are two different incidents instead of parts of one and the same. Once the optic nerves deliver signals to the thalamus, it is responsible for transferring the information to the primary visual cortex in the occipital lobe. But there can be a delay in any part of this journey which would result in two separate images arriving in the memory at different times. If the time difference is great enough a déjà vu can happen.