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Related Experiment Videos

MT+/V5 activation without conscious motion perception: a high-field fMRI study.

Kosuke Itoh1, Yukihiko Fujii, Ingrid L Kwee

  • 1Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, Asahimachi-Dori, Niigata 951-8585, Japan.

Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine
|December 13, 2005
PubMed
Summary

Neural activity in the MT+/V5 brain region is not sufficient for conscious visual motion perception. Functional MRI studies show MT+/V5 activation can occur without the subjective experience of motion.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Neural activity in the MT+/V5 area is considered essential for perceiving visual motion.
  • However, it remains unclear if this neural activity alone is sufficient to consciously perceive motion.

Purpose of the Study:

  • To investigate whether neural activity in the MT+/V5 region is a sufficient condition for the conscious perception of visual motion.

Main Methods:

  • A 3.0 Tesla functional magnetic resonance imaging (fMRI) study was conducted.
  • Eleven healthy subjects viewed a contrast-reversed checkerboard stimulus at 0.2, 12, 30, and 60 Hz.
  • Brain activation in MT+/V5 was monitored, and subjects reported their motion perception.

Main Results:

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  • At 12 and 30 Hz, MT+/V5 activation was observed in all subjects (11/11), yet 3/11 reported no motion perception.
  • At 60 Hz, 7/11 subjects did not perceive motion, but 5/7 showed MT+/V5 activation.
  • Significant MT+/V5 activation occurred in the absence of subjective motion awareness.

Conclusions:

  • Neural activity in MT+/V5 is not sufficient for conscious visual motion perception.
  • The findings suggest that additional neural processes beyond MT+/V5 activation are required for the subjective experience of seeing motion.