=+1. A teacher used distortion goggles, which shifted the wearer's gaze 20 degrees, to demonstrate an altered per- ception. A student wearing the goggles initially bumped into numerous desks and chairs while walking around, but after 30 minutes of wearing the goggles was able to smoothly avoid obstacles, illustrating the concept of

a. perceptual adaptation.

d. perceptual constancy.

b. visual interpretation.

c. sensory adaptation.

e. binocular cues.