Terrestrial Association relies on which concept?

Terrestrial Association relies on which concept?

• A. Color cues
• B. The relative size and apparent distance of objects from the observer, by comparing a known-size object with another object
• C. Motion cues only
• D. Shadow length

Answer: (B)

Depth perception on the ground comes from using known-size references to gauge distance. When you recognize the size of one object, you can judge how far away another object is by comparing their apparent sizes. This relative-size cue lets you estimate distance by calibration against a familiar object. Color, motion, and shadows can be unreliable or situational, so using a known-size reference to judge distance is the most dependable approach in terrestrial association.

Depth perception on the ground comes from using known-size references to gauge distance. When you recognize the size of one object, you can judge how far away another object is by comparing their apparent sizes. This relative-size cue lets you estimate distance by calibration against a familiar object. Color, motion, and shadows can be unreliable or situational, so using a known-size reference to judge distance is the most dependable approach in terrestrial association.