Developmental changes in size effects for simple tie and non-tie addition problems in 6- to 12-year-old children and adults

In the domain of cognitive arithmetic, size effect corresponds to an increase in solution times as a function operands involved problems. this study, we tracked evolution effects associated with tie and non-tie addition problems across development. We scrutinized progression for very small involving from 2 4, larger problems, 1-problems (problems 1 one operands) children Grade 5 adults. For first time, document presence sum up 8 children. contrast, 3 until adulthood, could not be evidenced. Crucially, whereas general is observed when contrasting one-digit additions large additions, show that, continuous observed. fact, all age groups, medium sums 8, 9, 10 do present at all. Given that problem sometimes referred most robust reliable numerical cognition literature, our results necessarily challenge its theoretical interpretation.