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Related Experiment Videos

Imaging the visual autokinetic illusion with fMRI.

Eva Riedel1, Thomas Stephan, Angela Deutschländer

  • 1Department of Neurology, Ludwig-Maximilians University, Klinikum Grosshadern, Marchioninistr. 15, D-81377 Munich, Germany. Eva.Riedel@nro.med.uni-muenchen.de

Neuroimage
|May 10, 2005
PubMed
Summary

Autokinesis, an illusion of apparent motion, intensifies with fixation time. Brain imaging revealed that the motion-sensitive area MT/V5 is activated when this visual illusion becomes more pronounced.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • Autokinesis is a visual illusion where a stationary light appears to move in darkness.
  • This illusion intensifies with prolonged fixation, suggesting a dynamic neural process.
  • Understanding the neural basis of autokinesis can provide insights into visual motion perception.

Purpose of the Study:

  • To investigate the neural correlates of the autokinetic illusion using functional magnetic resonance imaging (fMRI).
  • To identify brain regions involved in the mediation of autokinesis, particularly concerning its increase over time.

Main Methods:

  • Eleven healthy subjects underwent fMRI scanning while fixating on a stationary light-emitting diode (LED) in complete darkness for 35 seconds.
  • Blood-oxygen-level-dependent (BOLD) signal changes were compared between the first and second halves of the fixation period.

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  • Perceptual reports of autokinesis were correlated with brain activity.

    • Main Results:

    • Autokinesis was perceived as more pronounced in the second half of the fixation period compared to the first.
    • Bilateral activations were observed in the motion-sensitive middle occipito-temporal area, known as MT/V5, during the second half.
    • These MT/V5 activations correlated with the increased perception of autokinesis.

    Conclusions:

    • The findings suggest that the motion-sensitive area MT/V5 plays a crucial role in the mediation of the autokinetic illusion.
    • Increased activity in MT/V5 over time may underlie the intensification of perceived motion in the autokinetic effect.
    • This study contributes to understanding the neural mechanisms of visual perception and illusion formation.