Final answer:
The High-amplitude sucking method is a psychological technique used to study infant perception by measuring changes in an infant's sucking behavior in response to different stimuli.
Step-by-step explanation:
This method takes advantage of an infant's natural sucking behavior to gauge their interest in different stimuli, such as sounds or images. When an infant is presented with a stimulus they find interesting or novel, they will often increase their sucking rate, which is measured by the amplitude of the sucking action. The changes in sucking amplitude indicate the infant's level of engagement or preference for the stimulus presented. Within the context of studying audition in infants, for instance, the High-amplitude sucking method can be very informative as it helps researchers understand how babies perceive and differentiate between various sound frequencies and intensities. This method is particularly useful since very young infants are unable to communicate their experiences verbally. It provides a nonverbal way to explore perceptual capabilities and cognitive processes in early human development.