A new visual illusion of aspect-ratio context

Area of Science:

• Visual perception
• Psychophysics
• Optical illusions

Background:

• Perception of visual properties is affected by adaptation aftereffects.
• The tilt aftereffect and tilt illusion demonstrate repulsion from adapting orientations.
• Size aftereffects and the Ebbinghaus illusion show similar spatial and temporal context effects.

Purpose of the Study:

• To investigate and report evidence for a novel aspect-ratio illusion.
• To establish a spatial analogue to the known aspect-ratio aftereffect.

Main Methods:

• Psychophysical experiments were conducted.
• Participants perceived the aspect-ratio of target rectangles presented with surrounding context rectangles.

Main Results:

• A previously unknown aspect-ratio illusion was identified.
• The perceived aspect-ratio of a rectangle is repelled by the aspect-ratio of surrounding rectangles.
• This demonstrates a spatial context effect on aspect-ratio perception.

Conclusions:

• The newly identified aspect-ratio illusion provides a spatial counterpart to the aspect-ratio aftereffect.
• This finding expands our understanding of how spatial context influences visual perception of geometric properties.