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Perceptual foundation and extension to phase tagging for rapid invisible frequency tagging (RIFT).
Eelke Spaak1, Floortje G Bouwkamp1, Floris P de Lange1
1Donders Institute for Brain, Cognition, and Behaviour, Radboud University, Nijmegen, The Netherlands.
Imaging Neuroscience (Cambridge, Mass.)
|August 13, 2025
Summary
Rapid Invisible Frequency Tagging (RIFT) is a new brain imaging technique. Studies confirm RIFT is undetectable and works best with full-amplitude contrast, enabling new research in visual neuroscience.
Area of Science:
- Cognitive Neuroscience
- Visual Neuroscience
- Neuroimaging
Background:
- Rapid Invisible Frequency Tagging (RIFT) is an emerging visual stimulation protocol.
- RIFT uses rapidly oscillating luminance to evoke strong, measurable neural responses.
- Its high signal-to-noise ratio and perceived invisibility make it promising for studying visual processing.
Purpose of the Study:
- To provide robust evidence for the subjective undetectability of RIFT.
- To determine optimal parameters for RIFT, specifically luminance or contrast manipulation.
- To explore novel applications of RIFT beyond standard frequency tagging.
Main Methods:
- Subjective detection tests to confirm RIFT invisibility.
- Comparative analysis of full-amplitude vs. reduced-amplitude luminance/contrast modulation.
- Investigation of phase tagging as an alternative to frequency tagging in RIFT.
Main Results:
- RIFT stimuli were confirmed to be subjectively undetectable.
- Full-amplitude luminance or contrast manipulations yielded the best tagging results.
- Phase tagging was demonstrated as a reliable method for RIFT studies.
Conclusions:
- RIFT is a robust and subjectively invisible technique for visual neuroscience.
- Optimized RIFT protocols enhance signal quality and experimental design.
- The introduction of phase tagging expands the utility of RIFT for neural basis research.
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