In habituation-dishabituation studies examining infant cognitive abilities, how did researchers present the addition or subtraction "problems" to the infants?

Question

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Habituation-dishabituation studies typically use a visual habituation paradigm in which infants are shown a repeating stimulus until they become habituated to it, and then a new stimulus is presented to assess their level of attention or discrimination. In the case of addition or subtraction "problems," researchers would typically show the infants groups of objects that are covered and uncovered by a screen to assess their ability to discern changes in quantity.

In Habituation-Dishabituation Studies Examining Infant Cognitive Abilities, How Did Researchers