Dementia is an extreme deterioration in brain functioning. It involves aphasia, apraxia, agnosia, and/or impaired executive functioning.
Aphasia: Impairment in expressing and understanding written and spoken language.
Apraxia: Impairment in ability to carry out motor tasks.
Agnosia: Inability to recognize and identify objects, persons, or sounds.
Impairment in executive functioning: Impairment in the ability to plan, organize, and/or think abstractively.
Dementia is not a diagnosis in itself. It is a symptom of a medical/ clinical condition: stroke, head injury, brain tumor, substance abuse, Parkinson's disease, and Alzheimer's disease.
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