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Related Concept Videos

Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.

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Lateralized responses during covert attention are modulated by target eccentricity.

Ali Bahramisharif1, Tom Heskes, Ole Jensen

  • 1Radboud University Nijmegen, Institute for Computing and Information Sciences, Nijmegen, The Netherlands. ali@cs.ru.nl

Neuroscience Letters
|January 11, 2011
PubMed
Summary

Covert attention to visual targets enhances brain-computer interface (BCI) performance. Increased target eccentricity amplifies the brain

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Area of Science:

  • Neuroscience
  • Brain-Computer Interfacing
  • Visual Attention

Background:

  • Covert attention to visual field locations serves as a control signal for brain-computer interfaces (BCIs).
  • A known pattern is the lateralization of posterior alpha activity: decreasing in the hemisphere contralateral to attention and increasing ipsilaterally.

Purpose of the Study:

  • To investigate the impact of target eccentricity on the performance of a covert attention-driven BCI.
  • To determine if the classical alpha activity lateralization pattern is influenced by attended location eccentricity.

Main Methods:

  • Utilized a BCI system driven by covert attention.
  • Analyzed the effect of varying target eccentricities on BCI performance and electrophysiological lateralization patterns.

Main Results:

  • The lateralization pattern of posterior alpha activity became more pronounced with increasing target eccentricity.
  • A minimum eccentricity of approximately 6° of visual angle was identified as necessary for acceptable BCI classification performance with targets in opposite hemifields.

Conclusions:

  • Target eccentricity significantly modulates the effectiveness of covert attention-based BCIs.
  • Eccentricity influences the robustness of the alpha activity lateralization, impacting BCI classification accuracy.