Visual and haptic perception of the horizontal-vertical illusion

Area of Science:

• * Psychology
• * Visual Perception
• * Haptic Perception

Background:

• * The horizontal-vertical illusion is a perceptual phenomenon where a vertical line is perceived as longer than a horizontal line of equal physical length.
• * This illusion has been demonstrated across different sensory modalities, including vision and touch.
• * Common configurations include the inverted-T and L-shape.

Purpose of the Study:

• * To compare the magnitude of the horizontal-vertical illusion between visual and haptic perception.
• * To investigate potential differences in illusion strength between the inverted-T and L-shape configurations.

Main Methods:

• * Participants were presented with visual and haptic stimuli of the horizontal-vertical illusion.
• * The stimuli included both inverted-T and L-shape configurations.
• * The magnitude of the illusion was assessed for each sensory modality and configuration.

Main Results:

• * The horizontal-vertical illusion effect was significantly greater in haptic perception compared to visual perception.
• * The inverted-T configuration elicited a stronger illusory effect than the L-shape configuration.
• * Both findings were statistically significant.

Conclusions:

• * Haptic perception is more susceptible to the horizontal-vertical illusion than visual perception.
• * The spatial arrangement of lines influences susceptibility, with the inverted-T being more prone to the illusion.
• * These findings contribute to understanding cross-modal perception and spatial illusions.