The term cognition describes the human brain’s ability to learn, think and process information. The hippocampus contains the neural circuitry crucial for cognitive functions such as learning and memory. Cognitive functions must be intact to accomplish daily living activities. Impairment of cognitive functions results in difficulty in coping with both complex and everyday activities, which may sometimes lead to increased sensitivity to stress. Several disorders which show cognitive impairment are neuropsychiatric disorders, cerebrovascular disorders and Parkinsonism. Alzheimer’s disease and Stroke are quantitatively most important causes of cognitive impairment in adults.

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