When a person looses the capacity to think independently and rationally, whose intellectual levels are not developed then the person is called mentally disabled. There are several types of mental retardation or mental disability.
Down’s syndrome – It is a genetic disability in which there is a problem in the 21st pair of chromosomes.
Autism – The part of the brain dealing with communication is damaged then it can lead to autism. Eye to eye contact, conversation and sometimes even basic motor abilities get affected.
Psychosis and neurosis – Split personality, hallucination, and schizophrenia are all types of this disorder.
Learning disability – Dyslexia, disgraphia or discalculacia are all part of learning disability. The learning capacity of an individual in this type of disability is slow and needs special methods for learning.