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Breaching Subjects' Thoughts Privacy: A Study with Visual Stimuli and Brain-Computer Interfaces.

Mario Quiles Pérez1, Enrique Tomás Martínez Beltrán1, Sergio López Bernal1

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Brain-computer interfaces (BCIs) can extract sensitive data using visual stimuli and P300 potentials. Research shows supraliminal stimuli yield P300 responses, but subliminal stimuli impact remains unconfirmed, with younger subjects showing faster responses.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Computer Science

Background:

  • Brain-computer interfaces (BCIs) are expanding beyond clinical use into entertainment and learning.
  • Monitoring neuronal activity, like evoked potentials, is crucial for understanding central nervous system responses.
  • Data sensitivity in BCIs necessitates secure transmission methods, with blockchain offering integrity solutions.

Purpose of the Study:

  • To investigate the potential for extracting sensitive information from evoked potentials using visual stimuli in BCIs.
  • To address the gap in literature regarding the impact of subliminal visual stimuli on BCI data.
  • To analyze the relationship between visual stimuli, P300 evoked potentials, and subject privacy.

Main Methods:

  • Conducted five experiments on ten subjects to assess the impact of visual stimuli on brain responses.
  • Presented familiar visual stimuli, gradually decreasing image sampling time from supraliminal to subliminal.
  • Monitored for P300 evoked potentials in response to visual stimuli across varying exposure levels.

Main Results:

  • Supraliminal visual stimuli elicited P300 potentials in approximately 50% of trials across subjects.
  • Decreasing image sampling time reduced the effectiveness of potential data extraction.
  • The impact of subliminal visual stimuli on P300 potentials was not definitively confirmed.
  • Younger subjects generally exhibited shorter response latencies to visual stimuli.

Conclusions:

  • This study confirms that sensitive data can be extracted from subjects using visual stimuli and P300 potentials.
  • The findings highlight significant privacy concerns associated with BCI technology, particularly concerning visual information processing.
  • Further research is needed to fully understand the effects of subliminal stimuli and to develop robust privacy-preserving techniques for BCIs.