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Space, time, and numbers in the right posterior parietal cortex: Differences between response code associations and

Martin Riemer1, Nadine Diersch1, Florian Bublatzky2

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Summary

The right posterior parietal cortex (PPC) is involved in integrating spatial, temporal, and numerical information. Inhibiting this area affects perceptual congruency but not response associations, suggesting distinct neural mechanisms.

Keywords:
Mental number lineMental time linePosterior parietal cortexSNARCSimon effectTranscranial magnetic stimulation

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Area of Science:

  • Cognitive neuroscience
  • Neuroimaging
  • Human perception

Background:

  • The posterior parietal cortex (PPC) is hypothesized to house a general magnitude system linking space, time, and number.
  • Previous research suggests an overlap in the neural representation of these magnitudes.
  • Comparative studies investigating the PPC's role across spatial, temporal, and numerical dimensions are limited.

Purpose of the Study:

  • To investigate the role of the right PPC in integrating spatial, temporal, and numerical information.
  • To differentiate the neural mechanisms underlying magnitude associations and perceptual congruency effects.
  • To examine the impact of right PPC inhibition on spatial, temporal, and numerical congruency and association effects.

Main Methods:

  • Utilized continuous theta-burst stimulation (cTBS), a form of transcranial magnetic stimulation (TMS), to inhibit the right intraparietal sulcus (IPS).
  • Employed a unified experimental paradigm to assess Simon, SNARC, and STARC effects, alongside congruency effects between space, time, and number.
  • Measured the impact of right PPC inhibition on both response code associations and perceptual congruency.

Main Results:

  • Right PPC inhibition significantly affected congruency effects between perceptual dimensions (space, time, number).
  • Response code associations (Simon, SNARC, STARC effects) were not modulated by right PPC inhibition.
  • Interactions between space and time perception were evident in congruency effects, but not in time-spatial response associations.

Conclusions:

  • The findings suggest distinct neural substrates for perceptual congruency and behavioral response associations within the PPC.
  • Perceptual congruency between dimensions like space and time is processed in PPC regions along the IPS.
  • The integration of percepts with behavioral responses appears independent of the right PPC, indicating specialized processing streams.