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Related Experiment Video

Updated: Apr 28, 2026

Testing Tactile Masking between the Forearms

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Published on: February 10, 2016

How color, regularity, and good Gestalt determine backward masking.

Bilge Sayim¹, Mauro Manassi², Michael Herzog²

¹Laboratory of Psychophysics, Brain Mind Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandLaboratory of Experimental Psychology, University of Leuven, Leuven, Belgium.

Journal of Vision

|June 20, 2014

Summary

Visual masking and crowding share similar grouping mechanisms, but temporal factors in masking also influence performance. Spatial layout and grouping significantly impact visual backward masking strength.

Keywords:

Gestalt backward masking crowding grouping perceptual organization

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Area of Science:

Visual perception
Cognitive psychology
Neuroscience

Background:

Visual backward masking strength is influenced by stimulus onset asynchrony (SOA) and spatial layout.
Masking and crowding strength depend on target-mask or target-flanker grouping.
Grouping effects are critical in understanding visual processing.

Purpose of the Study:

To investigate the role of spatial layout and grouping in visual backward masking.
To compare masking and crowding mechanisms.
To determine how spatial factors interact with temporal factors (SOA) and color differences in visual masking.

Main Methods:

Presented a vernier target followed by various flanker configurations at different SOAs.
Manipulated flanker color (red vs. green), arrangement (regular vs. irregular), and shape (lines vs. cuboids).
Measured masking strength based on target identification or discrimination performance.

Main Results:

Masking strength was reduced for arrays of green flankers compared to red flankers, suggesting spatial factors can override color differences.
Irregularly arranged flankers caused stronger masking than regularly arranged ones, similar to crowding.
Cuboid flankers did not reduce masking as effectively as they reduce crowding, possibly due to longer processing times for complex shapes.

Conclusions:

Visual masking and crowding share underlying grouping mechanisms.
Spatial layout and grouping are crucial for visual backward masking, comparable to their role in crowding.
Temporal factors (SOA) in masking provide additional grouping cues not present in crowding, modulating performance.