Aperson who demonstrates an exceptional specific mental skill while otherwise remaining very limited in intellectual capacity is said to show signs

   Savant syndrome

Explanation:  It is a syndrome that occurs and exists in a condition that can be characterised as generally mentally disturbed, and where exceptional and above average skill in a particular mental activity occurs. Individuals with such a pronounced above-average mental skill are usually inclined to exhibit such above-average skills when it comes to memory, such as easy memory of numbers, easy and fast calculation, or easy mastering of music, and any skill that requires a wealth of data and their memory. Therefore, such persons are generally considered to be persons with disabilities, but with some pronounced and expressed skill that stands out in itself is above average.

answer; evidence; reverseremand;