| Sumario: | The difficulty of a word problem is influenced by both linguistic and arithmetic processes. However, whether these processes are sequential or interactive is a matter of debate. Little is known about how eye-movement behaviour changes when faced with different linguistic and arithmetic task characteristics, both in relation to the entire problem and to specific components (i.e., numerical and textual elements). To address this gap, we conducted a study monitoring the eye movements of children aged 10-13 years during word problem solving. We manipulated linguistic and arithmetic task characteristics independently, focusing on the mathematical factor operation (addition/subtraction) and the linguistic factors consistency (consistent/ inconsistent) and nominalization (verbalized/nominalized). The results revealed that eye movements generally increased as linguistic difficulty (e.g., nominalization) or arithmetic difficulty (e.g., operation) increased. Thereby, specific parts of the text were differentially affected based on the task characteristics. Increasing arithmetic difficulty led to a shift in eye movements towards numerical elements, while increasing linguistic difficulty resulted in a shift towards textual elements. Interestingly, the increase in arithmetic difficulty also influenced processing in the linguistic domain. For example, textual parts of the word problem received more fixations when the arithmetic difficulty increased, but not vice versa. This suggests that text comprehension and calculation processes in word problem solving are not separate and not strictly sequential; instead, they interact and/or do partially rely on shared cognitive resources.
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