Which testing method is objective and relies on electrophysiological responses rather than infant behavior?

Which testing method is objective and relies on electrophysiological responses rather than infant behavior?

• A. Pattern VEP
• B. Forced Choice Preferential Looking
• C. Teller Acuity Cards
• D. Cardiff Cards

Answer: (A)

This item examines an objective, physiology-based way to assess vision that doesn’t depend on how the infant behaves. Pattern VEP uses electrodes to record brain activity in the visual cortex in response to a patterned stimulus, like alternating black-and-white gratings. When the pattern is detected by the visual system, the EEG shows a reliable, time-locked response (often a characteristic waveform such as the P100). By presenting patterns of different spatial frequencies, you can determine the finest pattern that evokes a response, giving an acuity estimate without requiring the infant to look toward or indicate a target. Forced Choice Preferential Looking and the Teller and Cardiff Cards rely on the infant’s or observer’s interpretation of gaze or looking behavior, which makes them behavioral rather than electrophysiological.

This item examines an objective, physiology-based way to assess vision that doesn’t depend on how the infant behaves. Pattern VEP uses electrodes to record brain activity in the visual cortex in response to a patterned stimulus, like alternating black-and-white gratings. When the pattern is detected by the visual system, the EEG shows a reliable, time-locked response (often a characteristic waveform such as the P100). By presenting patterns of different spatial frequencies, you can determine the finest pattern that evokes a response, giving an acuity estimate without requiring the infant to look toward or indicate a target.

Forced Choice Preferential Looking and the Teller and Cardiff Cards rely on the infant’s or observer’s interpretation of gaze or looking behavior, which makes them behavioral rather than electrophysiological.