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Concept
Preferential looking
Résumé
Preferential looking is an experimental method in developmental psychology used to gain insight into the young mind/brain. The method as used today was developed by the developmental psychologist Robert L. Fantz in the 1960s.
According to the American Psychological Association, the preferential looking technique is "an experimental method for assessing the perceptual capabilities of nonverbal individuals (e.g., human infants, nonhuman animals)". If the average infant looks longer at a novel stimulus compared to a familiar stimulus, this suggests that the infant can discriminate between the stimuli. This method has been used extensively in cognitive science and developmental psychology to assess the character of infants' perceptual systems, and, by extension, innate cognitive faculties. An investigator or examiner observes an infant's eye movements to determine which stimulus the infant fixates on.
Robert L. Fantz (1925-1981) was a developmental psychologist who launched several studies on infant perception including the preferential looking paradigm. Fantz introduced this paradigm in 1961 while working at the Case Western Reserve University. The preferential looking paradigm is used in studies of infants regarding cognitive development and categorization. Fantz's study showed that infants looked at patterned images longer than uniform images. He later built upon his study in 1964 to include habituation situations. These situations exhibited an infants preference for new or unusual stimuli.
Conclusions have been drawn from preferential looking experiments about the knowledge that infants possess. For example, if infants discriminate between rule-following and rule-violating stimuli—say, by looking longer, on average, at the latter than the former—then it has sometimes been concluded that infants know the rule.
Here is an example: 100 infants are shown an object that appears to teleport, violating the rule that objects move in continuous paths.
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