Here I present: “Dyscalculia”, Victor McKusick, Mendelian Inheritance in Man’, 1966. 計算障礙。icd10=F81.2 (DGS).
INTRODUCTION.
Difficulty with subitizing is one of the core deficits in dyscalculia. Subitizing is the instantaneous visual perception of the number of items in a small group, without having to count them one by one.
Reading, spelling, and arithmetic are crucial domains of neurodevelopmental learning disorders in written language processing (dyslexia) and arithmetic (dyscalculia).
F81.2 Specific disorder of arithmetic: involves a specific developmental impairment in arithmetical skills that is not solely explicable on the basis of general mental retardation or of inadequate schooling. The deficit concerns mastery of basic computational skills of addition, subtraction, multiplication, and division.
Gerstmann Syndrome refers to a neuropsychological disorder characterized by impaired arithmetic skills (dyscalculia), inability to identify fingers (finger agnosia), left/right confusion, and agraphia.
Developmental Gerstmann Syndrome (DGS) is not listed in Victor McKusick, Mendelian Inheritance in Man’, 1966 as a disorder that has been characterized by geneticists.
