This question comes from a clinical impression. I wanted to know if any work exists on this topic.
Dear Camille,
Maybe the following papers will help:
In the paper,
Bertella, L., Semenza, C., Mori, I., Pignatti, R., & Ceriani, F. (2005). A relative vowel
deficit in aphasia sparing the lexicon of numbers. Brain and Language, 95(1), 30-31. the authors wrote "However, the category of numbers was an exception. Indeed GBC not only had a digit span of 4.5, but could repeat and read (in both the Arabic and alphabetic codes) complex numbers up to eight digits without being affected by phonemic errors: his only, relatively few, errors were lexical substitutions, while virtually no number syntax violation was detected."
In the paper,
"De Letter, M., Van Borsel, J., Batens, K., Megens, M., Hemelsoet, D., Verreyt, N., ... &
Santens, P. (2012). Speaking in numbers as a transitional phase between mutism
and Wernicke's aphasia: A report of three cases. Aphasiology, 26(7), 917-932."
the authors discussed the numerical speech as a transitional phase between mutism and Wernicke’s aphasia.
In the paper,
"Li, T., Cui, J., Yuan, L., Yu, X., & Zhou, X. (2021). Common neural circuit for semantic-
based articulation of numbers and words: A case study of a patient with Broca's
aphasia. Journal of Neurolinguistics, 58, 100969."
the authors showed an association between numbers and non-number words in phonological processing. Given the similar disabilities in speech production, we conclude that Broca's area contains neural correlates for the phonological processing of numbers and words.
Best regards,
Yaakov
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