Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Multi-Infarct Dementia ?
    ### Response:
    Multi-infarct dementia (MID) is a common cause of memory loss in the elderly. MID is caused by multiple strokes (disruption of blood flow to the brain). Disruption of blood flow leads to damaged brain tissue. Some of these strokes may occur without noticeable clinical symptoms.
    