Progressive decline of semantic memory with preservation of number processing and calculation.

@article{Diesfeldt1993ProgressiveDO,
  title={Progressive decline of semantic memory with preservation of number processing and calculation.},
  author={Han F.A. Diesfeldt},
  journal={Behavioural neurology},
  year={1993},
  volume={6 4},
  pages={239-42}
}
A 75-year-old man with seven years of formal education displayed a syndrome of progressive and severe lexical impairments to word comprehension and production (semantic dementia). While he lost the ability to recognize written arithmetical signs, he could still retrieve the arithmetical facts for addition and subtraction of all number combinations of 1 to 9 and 11 to 19, though his mastery of multiplication tables (2 to 9) was unreliable. Calculation procedures were intact. Over the course of… CONTINUE READING