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MEG Evidence That Modality-Independent Conceptual Representations Contain Semantic and Visual Features.

Julien Dirani1, Liina Pylkkänen2,3,4

  • 1Departments of Psychology, New York University, New York, New York 10003 julien.dirani@nyu.edu.

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Brain concepts are independent of how we sense them. Our study shows these modality-independent representations include both semantic and visual information, not just one or the other.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Semantic knowledge can be accessed via various sensory inputs (e.g., images, words).
  • Previous research suggests modality-independent brain representations exist, but their content is not fully understood.
  • These representations may encompass semantic, perceptual, or orthographic features.

Purpose of the Study:

  • To investigate the content of modality-independent conceptual representations in the human brain.
  • To determine if these representations are purely semantic or also include perceptual features.

Main Methods:

  • Utilized magnetoencephalography (MEG) on 25 human participants.
  • Developed a novel cross-condition decoding approach using neural network classifiers.
  • Compared learned latent representations with semantic, sensory, and orthographic feature models.

Main Results:

  • Modality-independent representations showed significant correlations with both semantic and visual features.
  • No evidence was found for correlations due to picture-specific visual features.
  • Orthographic features did not drive the observed correlations.

Conclusions:

  • Modality-independent conceptual representations in the brain integrate both semantic and perceptual information.
  • These findings advance our understanding of how the brain stores and accesses knowledge across different sensory modalities.