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When do we find a third neural response to visual symmetry?

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • The human visual system exhibits a strong sensitivity to symmetry.
  • Event-Related Potential (ERP) studies have identified the Sustained Posterior Negativity (SPN) as a neural correlate of visual symmetry.
  • Previous research localized the SPN to bilateral extrastriate cortex, but an exploratory study suggested a third symmetry-related response in the posterior cingulate.

Purpose of the Study:

  • To validate the existence and reliability of a third symmetry-related neural response.
  • To investigate the conditions under which this third response is generated and its relationship with the established SPN.
  • To re-analyze existing datasets using source localization to confirm or refute the presence of the posterior cingulate dipole.

Main Methods:

  • Source localization analysis was performed on all suitable datasets from the Liverpool SPN catalogue.
  • Two hypotheses were tested: 1) a two-dipole model would explain less variance in regularity classification tasks, and 2) the third dipole's amplitude would correlate with the sensor-level SPN.
  • Analysis included data from 2215 participants across 40 projects.

Main Results:

  • Hypothesis 1 was not supported; the two-dipole model's explanatory power was not significantly reduced in regularity classification tasks.
  • Hypothesis 2 was supported; the amplitude of the third symmetry response correlated with the sensor-level SPN.
  • A third symmetry response, distinct from the bilateral extrastriate activity, was confirmed in some conditions, localized near the posterior cingulate.

Conclusions:

  • The bilateral extrastriate symmetry response is sometimes followed by a third activation near the posterior cingulate, particularly when symmetry is task-relevant and salient.
  • This third symmetry response is not consistently observed and may be masked by trial-to-trial temporal inconsistencies, especially in experiments with longer stimulus presentation durations.
  • Further research is needed to understand the precise functional role and optimal detection conditions for this posterior cingulate symmetry response.