Gerstmann syndrome is a cluster of neurological symptoms that includes difficulty writing (dysgraphia or agraphia), difficulty with arithmetic (dyscalculia or acalculia), an inability to distinguish left from right.

Gabriella Szanto has written:

'Arithmetic disability of adults' -- subject(s): Numeracy, Learning disabled, Math anxiety, Acalculia, Arithmetic, Study and teaching (Continuing education)

I think it's the parietal lobe. This is because acalculia is an acquired inability to make simple mathematiacal calculations and a definite sympton of it is disease in the parietal lobe. Most likely to be the left side of the brain of the parietal lobe. A deduction though.

Hope this helped,
-Drew

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -C--C--I-. That is, nine letter words with 2nd letter C and 5th letter C and 8th letter I. In alphabetical order, they are:

acalculia

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern AC------A. That is, nine letter words with 1st letter A and 2nd letter C and 9th letter A. In alphabetical order, they are:

acalculia

acetabula

achalasia

acroteria