Answer:
Cross-modal perception
Explanation:
Cross model perception is the perception in which people perceive the object in one sensory modality that they do have perceived previously in another modality. For example, when a child perceived a pacifier without seeing it and after some time start to see it as well as the example of cross-modal perception.
Thus in the above context, the researcher first gave a one-month-old infant a bumpy pacifier that infant feel it through the mouth. After that infant has to allowed to look at pacifiers not explored orally is the example of cross-modal perception.