Alzheimer disease: A condition that occurs late in life and worsens with time in which brain cells degenerate; it is accompanied by memory loss, physical decline, and confusion

Attention Deficit Disorder: A mental disorder, with onset in childhood, characterised by developmentally inappropriate inattention, impulsiveness, and varying hyperactivity.

Depression: Mental state of low mood commonly associated with feelings of sadness, emptiness, despair or loss of interest in life or worldly matters.

Functional Magnetic Resonance Imaging: A noninvasive tool used to observe functioning in the brain or other organs by detecting changes in chemical composition, blood flow, or both.

Schizophrenia: The most common form of psychosis, characterized by partial or total withdrawal of interest in the world outside of oneself and loss of intellectual and emotional function.

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