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Surround suppression in the human visual cortex: an analysis using magnetoencephalography.

Yoshio Ohtani1, Shoichi Okamura, Yoshikazu Yoshida

  • 1Faculty of Engineering and Design, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606-8585, Kyoto, Japan. ohtani@hiei.kit.ac.jp

Vision Research
|July 20, 2002
PubMed
Summary

Surround stimuli suppress neural responses in the human visual cortex, similar to findings in cats and primates. This surround suppression, observed in early magnetic responses, suggests neural inhibition at initial visual processing stages.

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Area of Science:

  • Neuroscience
  • Visual Neuroscience
  • Human Brain Imaging

Background:

  • Neurons in primate and cat primary visual cortices (V1) exhibit suppressed responses to stimuli within their classical receptive fields (CRFs) when surrounded by other stimuli.
  • This phenomenon, known as surround suppression, is a fundamental aspect of visual processing.

Purpose of the Study:

  • To investigate whether surround suppression affects visually evoked magnetic responses in the human visual cortex.
  • To characterize the properties of this magnetic response and compare it to neuronal findings in animal models.

Main Methods:

  • Magnetoencephalography (MEG) was used to measure magnetic responses in the human visual cortex.
  • A test grating stimulus was presented with and without high-contrast surrounding gratings.

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  • Current source localization with a single dipole model was employed to identify the origin of the magnetic response.

    • Main Results:

    • Visually evoked magnetic responses showed reduced peak amplitude when the test grating was surrounded by other gratings.
    • The suppression effect increased with higher surround contrast and decreased with higher test contrast.
    • The early latency (around 90 ms) and contrast dependence of the suppression align with single-cell studies in animal V1.

    Conclusions:

    • Surround suppression is present in early magnetic responses of the human visual cortex.
    • This suppression likely results from inhibitory neural activity in early visual processing stages, potentially V1.
    • Findings support the cross-species consistency of visual processing mechanisms, particularly surround suppression.