Left vs. Right
Linear reasoning and language functions such as grammar and vocabulary often are lateralized to the left hemisphere of the brain. Dyscalculia is a neurological syndrome associated with damage to the left temporo-parietal junction. This syndrome is associated with poor numeric manipulation, poor mental arithmetic skill, and the inability to either understand or apply mathematical concepts.
In contrast, prosodic language functions, such as intonation and accentuation, often are lateralized to the right hemisphere of the brain. Functions such as the processing of visual and audiological stimuli, spatial manipulation, facial perception, and artistic ability seem to be functions of the right hemisphere.
Other integrative functions, including arithmetic, binaural sound localization, and emotions, seem more bilaterally controlled.
Left hemisphere functions
numerical computation (exact calculation, numerical comparison, estimation)
left hemisphere only: direct fact retrieval
language: grammar/vocabulary, literal
Right hemisphere functions
numerical computation (approximate calculation, numerical comparison, estimation)
language: intonation/accentuation, prosody, pragmatic, contextual