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Neural correlates of stimulus reportability.

Oliver J Hulme1, Karl F Friston, Semir Zeki

  • 1Wellcome Trust Center for Neuroimaging,University College London. o.hulme@ucl.ac.uk

Journal of Cognitive Neuroscience
|October 1, 2008
PubMed
Summary

This study used fMRI to investigate stimulus reportability, distinguishing neural activity related to stimulus processing, decision-making, and motor response. Findings map distinct brain regions to these functions, aiding consciousness research.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychology

Background:

  • Experiments on neural correlates of consciousness often use stimulus reportability.
  • Understanding the neural basis of stimulus reportability is crucial for interpreting these experiments.

Purpose of the Study:

  • To investigate the neural correlates of stimulus reportability.
  • To differentiate neural activity associated with stimulus processing, decision-making, and motor response.

Main Methods:

  • Used functional magnetic resonance imaging (fMRI) with a partial report object detection paradigm.
  • Employed signal detection theory to deconstruct the neural basis of stimulus reportability.
  • Varied stimulus presentation, cue delays, and motor actions to decouple cognitive processes.

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Last Updated: Jun 30, 2026

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Main Results:

  • Retinotopically specific responses in early visual cortex correlated with stimulus processing, not decision or report.
  • Parietal/temporal regions correlated with decisions, independent of stimulus presence.
  • Classical motor regions correlated with the motor report itself.

Conclusions:

  • Established a framework for understanding the neural basis of stimulus reportability.
  • Differentiated neural substrates for stimulus processing, decision, and report.
  • Provides insights into consciousness research without assuming reportability equals consciousness.