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Frequency tagging of spatial attention using periliminal flickers.

Simon Ladouce^1,2, Frédéric Dehais^1,3

¹Human Factors and Neuroergonomics, Institut Superieur de l'Aeronautique et de l'Espace, Toulouse, France.

Imaging Neuroscience (Cambridge, Mass.)

|August 13, 2025

Summary

Researchers developed less intrusive visual stimuli for Steady-State Visually Evoked Potentials (SSVEPs) by reducing flicker intensity. This improved user experience and maintained accuracy in measuring spatial attention for cognitive neuroscience and Brain-Computer Interfaces (BCI).

Keywords:

EEG flickers frequency-tagging SSVEP periliminal spatial attention subliminal user experience

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Area of Science:

Neuroscience
Cognitive Science
Human-Computer Interaction

Background:

Steady-State Visually Evoked Potentials (SSVEPs) are crucial for cognitive neuroscience and Brain-Computer Interfaces (BCI).
Traditional SSVEP stimuli (flickers) can cause discomfort, eye strain, and fatigue.
Altering flicker characteristics may enhance user experience and stimulus efficacy.

Purpose of the Study:

To investigate the use of periliminal (at threshold) and subliminal (below threshold) amplitude modulation depths for SSVEP stimuli.
To assess the effectiveness of these less conspicuous flickers in capturing spatial attention.
To improve user experience in SSVEP-based paradigms.

Main Methods:

Participants performed a visual attention task with spatially cued targets.
Flickering stimuli (13 and 15 Hz) were presented at periliminal and subliminal levels, determined individually.
Electroencephalography (EEG) recorded SSVEP responses to analyze spatial attention.

Main Results:

Subjective feedback confirmed improved user experience with periliminal and subliminal flickers.
Single-trial classification accuracy for spatial attention reached 81.1% (periliminal) and 58% (subliminal).
SSVEP responses to inconspicuous flickers successfully derived spatial attention.

Conclusions:

Periliminal and subliminal flickers are viable, less intrusive alternatives for SSVEP paradigms.
These findings support the use of inconspicuous stimuli in cognitive neuroscience and BCI development.
Reduced-amplitude SSVEPs offer a promising avenue for more comfortable and effective brain-computer interfaces.