Final answer:
The 'looking chamber' developed by Robert Fantz allowed experimenters to determine how long an infant looked at each display, revealing their visual preferences and cognitive engagement.
Step-by-step explanation:
The "looking chamber" developed by Robert Fantz is a classic tool in the field of developmental psychology used to study the visual preferences of infants. This apparatus allowed the experimenter to determine C. how long the infant looked at each display by observing through a peephole. It operates on the principle that infants will look longer at patterns and objects they find interesting or engaging, thus providing indirect insight into visual cognition and preference.
Researchers using the looking chamber can track these gaze durations to infer what captures an infant’s attention and for how long. It was a pioneering approach that sidestepped the limitations of studying non-verbal populations, such as infants, who cannot communicate their preferences or thoughts directly. This method is based on the preference looking paradigm, highlighting the importance of visual attention in early development.