Retinal image changes occur because the eye's position, the lighting, and the distance between an observer and the objects around them are always shifting. Despite these changes, our perception of objects generally remains stable. So, how does our brain achieve this?
The retinal image might change for several reasons:
- Movement: Both the observer and the objects in view can move.
- Distance: Objects look smaller or larger depending on how far away they are.
- Angle: The orientation of objects relative to the observer can change.
Our brains employ strategies such as depth cues and previous experiences to interpret these changing images. Through perceptual constancy, the brain can overcome the variable nature of the retinal image, ensuring that our perception remains stable, constant, and reliable. This process illustrates how adaptable and sophisticated our visual system truly is.