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Related Experiment Video

Updated: Jun 4, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Blind individuals show pseudoneglect in bisecting numerical intervals.

Zaira Cattaneo¹, Micaela Fantino, Juha Silvanto

¹Department of Psychology, University of Milano-Bicocca, Piazza dell'Ateneo Nuovo, Milan, Italy. zaira.cattaneo@unimib.it

Attention, Perception & Psychophysics

|February 3, 2011

Summary

Blind individuals exhibit a leftward bias in numerical tasks, similar to sighted individuals. This suggests spatial processing and pseudoneglect develop independently of visual input, impacting number representation.

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Last Updated: Jun 4, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

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Published on: April 11, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

Area of Science:

Cognitive Psychology
Neuroscience
Sensory Perception

Background:

Neurologically normal individuals exhibit a leftward bias, termed pseudoneglect, in bisecting physical lines and numerical intervals.
This numerical bias is thought to relate to the spatial representation of numbers on a mental number line.
Previous research indicated that congenitally blind individuals display a leftward bias in haptic line bisection.

Purpose of the Study:

To investigate whether blind individuals exhibit a leftward bias in numerical bisection.
To explore the role of visual input in the development of pseudoneglect and spatial processing biases.
To determine if pseudoneglect is based on mental representation or perceptual factors.

Main Methods:

Participants included congenitally blind individuals and a control group of blindfolded sighted individuals.
Numerical bisection tasks were administered using both ascending and descending numerical sequences.
Performance was compared to haptic line bisection tasks previously conducted with blind individuals.

Main Results:

Blind individuals demonstrated a consistent leftward bias in numerical bisection.
The leftward bias was more pronounced when numbers were presented in descending order compared to ascending order.
The magnitude of the bias in blind participants was comparable to that of blindfolded sighted participants.

Conclusions:

Pseudoneglect operates at a mental representational level, independent of direct perceptual input.
The findings support the development of right hemisphere dominance for spatial processing, even without visual experience.
This suggests that the bias towards overestimating the left side of space can form without visual input.