How can people adapt to spectacles that reverse visual images?

When individuals wear spectacles that reverse visual images, they initially experience disorientation because the new sensory input contradicts their well-learned, normal visual cues. However, the human perceptual system is capable of adapting to these significant deviations through a process of perceptual learning.12

Adaptation occurs as the brain re-evaluates sensory information to resolve the discrepancy between the distorted visual input and other sensory data, such as kinesthetic feedback from muscles. Research indicates that this process is significantly facilitated by active, self-initiated movement, which heightens exposure to the sensory discrepancy and encourages the brain to reorient to the environment. Over a considerable period, the subject learns to cope with the new visual stimuli, eventually perceiving the environment as "right side up" once again.12

When the spectacles are removed, the process reverses: the subject initially perceives the world as distorted, but quickly re-adapts to their original, normal visual cues. This demonstrates the brain's remarkable ability to adjust its functional interpretation of sensory input to maintain a unified experience of space.12