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CFS-crafter: An open-source tool for creating and analyzing images for continuous flash suppression experiments.

Guandong Wang¹, David Alais², Randolph Blake³

¹School of Psychology, The University of Sydney, Sydney, Australia. guandong.wang@sydney.edu.au.

Behavior Research Methods

|July 6, 2022

Summary

Continuous flash suppression (CFS) is a technique to study unconscious visual processing. A new open-source tool, CFS-crafter, enables controlled stimulus creation and analysis for more reliable research findings.

Keywords:

Binocular rivalry Continuous flash suppression Interocular suppression Subliminal perception Unconscious visual processing

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Area of Science:

Cognitive Neuroscience
Visual Perception
Psychophysics

Background:

Continuous flash suppression (CFS) is widely used to investigate unconscious visual processing.
The effectiveness of CFS relies on stimulus properties, but a lack of standardized methods hinders cross-study comparisons.
Variations in spatiotemporal mask and target properties affect the strength of interocular suppression.

Purpose of the Study:

To develop an open-source tool, CFS-crafter, for creating and analyzing controlled CFS stimuli.
To provide a streamlined workflow for researchers to design and customize visual stimuli for CFS experiments.
To facilitate principled stimulus selection and improve the generalizability of findings in visual awareness research.

Main Methods:

CFS-crafter is a point-and-click, open-source software tool.
It supports the creation and modification of CFS mask and target stimuli.
Image processing operations in the frequency domain (e.g., phase-scrambling, filtering) are integrated.

Main Results:

Users can generate diverse CFS stimuli, from classic patterns to custom images (objects, faces).
The tool allows for the analysis of stimulus properties, including frequency domain characteristics.
CFS-crafter requires minimal image processing knowledge, supported by integrated help files.

Conclusions:

CFS-crafter offers a standardized approach to creating and analyzing CFS stimuli.
The tool promotes controlled stimulus design, enhancing the reliability and comparability of visual awareness research.
It facilitates principled assessment of hypotheses regarding visual processing outside of awareness.