An amnestic mild cognitive impairment, also known as an aMCI, is a clinically recognized condition where memory impairment is greater than the expected range of impairment at the patient's current age.

mild, moderate, severe

An aMCI is an amnestic mild cognitive impairment, a clinically recognized condition where memory impairment is greater than the expected range of impairment.

Arnsberger Syndrome is a mild state of cognitive impairment that often precedes dementia.

It is a developmental disorder. There are cognitive systems impaired by autism though.