What does GRAM stand for?

What does GRAM stand for?

• A. Monocular Cue
• B. Geometric Perspective, Retinal Image Size, Aerial Perspective, Motion Parallax
• C. Retinal Image Size
• D. Aerial Perspective

Answer: (B)

GRAM is a mnemonic for four depth cues that can be perceived with one eye (monocular cues) or from motion. The four components are Geometric Perspective, Retinal Image Size, Aerial Perspective, and Motion Parallax. Geometric Perspective involves how perspective lines and the way objects align create a sense of depth—the familiar effect of parallel lines seeming to converge in the distance. Retinal Image Size refers to the idea that as objects get farther away, their image on the retina becomes smaller, signaling greater distance. Aerial Perspective captures how distant objects look hazier and bluer due to atmospheric scattering, reducing contrast and color saturation with distance. Motion Parallax is about relative motion during movement: nearer objects sweep past the observer more quickly than distant ones. These cues are especially useful because they don’t require both eyes to detect depth, which is why they’re grouped under GRAM. Other options mention only a single cue or a general category, not the complete set described by the mnemonic GRAM.

GRAM is a mnemonic for four depth cues that can be perceived with one eye (monocular cues) or from motion. The four components are Geometric Perspective, Retinal Image Size, Aerial Perspective, and Motion Parallax.

Geometric Perspective involves how perspective lines and the way objects align create a sense of depth—the familiar effect of parallel lines seeming to converge in the distance. Retinal Image Size refers to the idea that as objects get farther away, their image on the retina becomes smaller, signaling greater distance. Aerial Perspective captures how distant objects look hazier and bluer due to atmospheric scattering, reducing contrast and color saturation with distance. Motion Parallax is about relative motion during movement: nearer objects sweep past the observer more quickly than distant ones.

These cues are especially useful because they don’t require both eyes to detect depth, which is why they’re grouped under GRAM. Other options mention only a single cue or a general category, not the complete set described by the mnemonic GRAM.