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Related Experiment Video

Updated: Dec 7, 2025

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

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Published on: January 23, 2017

How Does Attention Alter Length Perception? A Prism Adaptation Study.

Yong-Chun Cai¹, Xian Su¹, Yu-Mei Yang¹

¹Department of Psychology and Behavioral Sciences, Zhejiang University, Hangzhou, China.

Frontiers in Psychology

|September 25, 2020

Summary

This summary is machine-generated.

Prism adaptation (PA) can alter how we perceive line length by shifting spatial attention. Left-shifting PA reduced a bias to see left-side lines as longer, demonstrating attention

Keywords:

appearance length perception prism adaptation pseudoneglect visual attention

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Area of Science:

Cognitive Neuroscience
Visual Perception
Psychophysics

Background:

The influence of attention on perceived object size, specifically length, remains debated.
Prism adaptation (PA) is a sensorimotor adaptation known to impact spatial tasks in various populations.
PA's effects are hypothesized to involve attentional mechanisms.

Purpose of the Study:

To investigate how prism adaptation (PA) influences the perceived length of lines.
To examine if PA-induced lateral shifts in spatial attention affect length perception.
To test the hypothesis that attention modulates visual appearance.

Main Methods:

A psychophysical procedure was used to assess line-length judgments before and after adaptation.
Participants (n=45) performed a line-length comparison task in the left and right visual fields.
Adaptation involved either left-shifting prisms, right-shifting prisms, or control goggles.

Main Results:

Participants initially exhibited a bias to perceive lines in the left visual field as longer.
Left-shifting PA significantly reduced this leftward bias in length perception.
Right-shifting PA and control conditions did not alter the initial length perception bias.

Conclusions:

Visuomotor adaptation via prism adaptation can modulate spatial attention.
This attentional shift, in turn, influences the perceived length of visual stimuli.
The findings support the notion that attention plays a role in altering visual appearance.