Visually reinforced preferential looking technique

A method for the study of early word comprehension that presents one auditory form (e.g., a word) from a speaker to the left of the child and one from a speaker to the right of the child. If the child turns toward the ‘correct’ direction, a rewarding stimulus such as a bunny playing a drum reinforces the correct looking. 

See Face recognition, Moderate-discrepancy hypothesis, Violation of expectancy technique