Summed volumes of silhouetted spheres

What is it about?

Assessing volumes of objects were found to be difficult for adult participants when the objects were represented two-dimensionally. The assessments of the total volume of the objects were also found to differ between below and above three objects in a set.

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Why is it important?

The study demonstrates numerical cognition as an inseparable part of more general (continuous) quantity processing in everyday challenges. Think, for example, the total amount of food that must often be figured out from the sizes and numerosities of spatially discrete food items.