Questions: 50. Infants show surprise when a departing train got louder and an approaching train got quieter. This indicates that infants Select one: O a. integrate vision and hearing to judge distance. O b. use linear perspective to judge distance. O c. use only auditory information to judge distance. O d. use only visual input to judge distance.

The answer is the first one (or A): integrate vision and hearing to judge distance.

Explanation for each option:

a. Integrate vision and hearing to judge distance.

• Correct. The fact that infants show surprise when the auditory cues (sound of the train) do not match the visual cues (movement of the train) suggests that they are using both senses together to judge distance. This integration of sensory information indicates that infants expect the sound to correlate with the visual movement of the train.

b. Use linear perspective to judge distance.

• Incorrect. Linear perspective is a visual cue related to the way parallel lines appear to converge as they recede into the distance. The scenario described involves auditory and visual integration rather than a purely visual cue like linear perspective.

c. Use only auditory information to judge distance.

• Incorrect. If infants were using only auditory information, they would not show surprise when the visual information contradicts the auditory information. The surprise indicates that they are integrating both types of information.

d. Use only visual input to judge distance.

• Incorrect. Similar to option c, if infants were using only visual input, the change in sound would not cause surprise. The surprise indicates that they are integrating both auditory and visual information.

Summary: Infants show surprise when the auditory and visual cues about the train's movement do not match, indicating that they integrate vision and hearing to judge distance.