Which description best defines preferential looking in infant language research?

Which description best defines preferential looking in infant language research?

• A. Observing facial expressions to gauge preference
• B. Recording heart rate changes in response to stimuli
• C. Measuring infants' gaze duration toward familiar vs unfamiliar stimuli to infer discrimination and learning
• D. Tracking sucking rate during stimuli

Answer: (C)

Preferential looking uses how long and where an infant looks to infer discrimination and learning. In language research, researchers present two stimuli side by side—often familiar versus unfamiliar language sounds—and measure which one the infant looks at longer. If the infant spends more time looking at one stimulus, it suggests they can tell the two apart and find one more engaging, signaling recognition or learning. This direct link between gaze duration and perceptual discrimination is what makes this description the best fit. Other methods—like heart rate changes, sucking rate, or facial expressions—capture arousal, engagement, or motor responses, but they don’t specifically quantify looking behavior as a measure of discrimination and learning in infants.

Preferential looking uses how long and where an infant looks to infer discrimination and learning. In language research, researchers present two stimuli side by side—often familiar versus unfamiliar language sounds—and measure which one the infant looks at longer. If the infant spends more time looking at one stimulus, it suggests they can tell the two apart and find one more engaging, signaling recognition or learning. This direct link between gaze duration and perceptual discrimination is what makes this description the best fit. Other methods—like heart rate changes, sucking rate, or facial expressions—capture arousal, engagement, or motor responses, but they don’t specifically quantify looking behavior as a measure of discrimination and learning in infants.