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Related Experiment Video

Updated: Jul 15, 2026

Eye Movements in Visual Duration Perception: Disentangling Stimulus from Time in Predecisional Processes

Eye Movements in Visual Duration Perception: Disentangling Stimulus from Time in Predecisional Processes

Published on: January 19, 2024

Spatial facilitation is involved in flash-lag effect.

Alejandro Maiche¹, Ruben Budelli, Leonel Gómez-Sena

¹Departament de Psicologia Bàsica, Evolutiva i de l'Educació, Universitat Autònoma de Barcelona, Bellaterra, Spain.

Vision Research

|April 21, 2007

Summary

The flash-lag effect (FLE), where a flash appears behind a moving object, is intensified by multiple moving stimuli. This suggests reduced perception delay in movement contributes to the FLE.

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Last Updated: Jul 15, 2026

Eye Movements in Visual Duration Perception: Disentangling Stimulus from Time in Predecisional Processes

Eye Movements in Visual Duration Perception: Disentangling Stimulus from Time in Predecisional Processes

Published on: January 19, 2024

Spatial Temporal Analysis of Fieldwise Flow in Microvasculature

Spatial Temporal Analysis of Fieldwise Flow in Microvasculature

Published on: November 18, 2019

Area of Science:

* Visual perception
* Psychophysics
* Neuroscience

Background:

* The flash-lag effect (FLE) describes the perception of a stationary flash lagging behind a moving object.
* Previous theories proposed latency differences between moving and flashed stimuli could explain the FLE.
* Empirical psychophysical evidence supporting these latency differences was lacking.

Purpose of the Study:

* To investigate the role of movement perception latency in the flash-lag effect.
* To determine if manipulating movement perception influences the FLE.
* To provide psychophysical data supporting latency-based explanations for the FLE.

Main Methods:

* Participants observed a continuously moving object and a simultaneously presented flash.
* The experiment involved presenting two concurrent moving stimuli to modulate movement perception.
* The magnitude of the flash-lag effect was measured under different stimulus conditions.

Main Results:

* The presence of two concurrent moving stimuli significantly increased the magnitude of the flash-lag effect.
* This augmentation is hypothesized to result from a decreased latency in movement perception.
* Findings indicate that spatial facilitation along the object's trajectory may reduce perceived delay.

Conclusions:

* Latency differences in visual processing play a crucial role in generating the flash-lag effect.
* Reduced movement perception delay, potentially via spatial facilitation, contributes to the FLE.
* The study provides psychophysical support for latency-based models of the flash-lag effect.