A moving texture-defined region against a texture background would be invisible to:
A) All motion detecting systems
B) All neural motion sensors
C) First-order motion sensors
D) Second-order motion sensors

Question

Quizplus · Accepted Answer

First-order motion sensors detect motion based on variations in luminance, which means they cannot perceive motion in texture-defined regions where luminance remains constant. Second-order motion sensors, however, can detect such motion because they respond to changes in contrast or texture.

A Moving Texture-Defined Region Against a Texture Background Would Be