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Related Experiment Video

Updated: Jun 14, 2026

Evaluating Usability Aspects of a Mixed Reality Solution for Immersive Analytics in Industry 4.0 Scenarios

Evaluating Usability Aspects of a Mixed Reality Solution for Immersive Analytics in Industry 4.0 Scenarios

Published on: October 6, 2020

What makes cast shadows hard to see?

Gillian Porter¹, Andrea Tales, Ute Leonards

¹Department of Experimental Psychology, University of Bristol, Bristol, UK. gillian.porter@bristol.ac.uk

Journal of Vision

|April 10, 2010

Summary

Visual search is slowed by cast shadows. This shadow processing impairment affects saccade count and object recognition, not low-level vision, and can be overcome with training.

Area of Science:

Visual perception
Cognitive psychology
Neuroscience

Background:

Visual search is demonstrably slower for cast shadows compared to non-shadow objects.
The specific neural and cognitive mechanisms underlying this shadow processing impairment remain unclear.

Purpose of the Study:

To investigate the processing levels responsible for shadow-related visual search slowing.
To examine the interaction of shadow processing with eye movements, perceptual learning, and stimulus context.

Main Methods:

Examined the effect of shadow stimuli on saccade metrics (number and timing).
Investigated the impact of prolonged perceptual training on shadow processing.
Assessed search performance with varying display configurations (unilateral vs. bilateral) and item locations (central vs. peripheral).

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Measuring the Behavioral Effects of Intraocular Scatter

Measuring the Behavioral Effects of Intraocular Scatter

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Measuring the Behavioral Effects of Intraocular Scatter

Measuring the Behavioral Effects of Intraocular Scatter

Published on: February 18, 2021

Main Results:

Shadow-related slowing primarily impacts the number of saccades, not the latency to the first saccade.
Perceptual learning can override shadow-induced slowing and transfer across different shadow types.
Slowing was reduced in unilateral displays but not affected by item eccentricity (peripheral vs. central).

Conclusions:

Shadow processing difficulties stem from higher-level object recognition processes, not low-level sensory mechanisms.
The visual system's challenge in distinguishing illumination from material properties contributes to shadow perception issues.
Findings suggest a link between object recognition and the visual system's interpretation of light and surface properties.