Data and analysis of behavioral and fNIRS data on arithmetic across the lifespan

Arithmetic skills are learnt in school and used up to old age. The question is whether the underlying processes of arithmetic change across the lifespan. This registered report (https://doi.org/10.1371/journal.pone.0256232) used functional near-infrared spectroscopy (fNIRS) in addition to behavioral measures (RT/ACC) to study the carry effect in two-digit addition and the borrow effect in two-digit subtraction in children (grade 3-4), younger adults (18-35 years) and older adults (above 60 years). Furthermore, processing speed, working memory, intelligence and math anxiety were assessed.