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Dissociating estimation from comparison and response eliminates parietal involvement in sequential numerosity

Seda Cavdaroglu1, Curren Katz1, André Knops1

  • 1Humboldt Universität zu Berlin, Faculty of Life Sciences, Department of Psychology, Rudower Chaussee 18, 12489 Berlin, Germany.

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|April 19, 2015
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Summary
This summary is machine-generated.

The parietal cortex is not involved in estimating sequential numerosity unless a response is required. Brain activity for number sense is modality-specific until a comparison task activates the parietal cortex.

Keywords:
Multivariate pattern analysisNumber senseNumerical cognitionSupramodal numerosityfMRI

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Numerical Cognition

Background:

  • The parietal cortex's role in abstract numerical representation is debated.
  • Previous research suggests parietal involvement for simultaneous visual stimuli.
  • The representation of sequential and cross-modal numerosities remains unclear.

Purpose of the Study:

  • To investigate parietal cortex activation for sequential visual and auditory numerosity.
  • To differentiate numerosity estimation from comparison and response factors.
  • To determine if numerosity is represented in a sensory-independent manner.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) to measure brain activity (BOLD response).
  • Multivariate pattern analysis (MVPA) and support vector regression (SVR) to decode numerosity.
  • Experimental design separating estimation, comparison, and response phases.

Main Results:

  • Parietal cortex activation increased only during numerosity comparison requiring a response.
  • Numerosity was decoded in sensory-specific regions (auditory/visual cortex) during estimation.
  • Parietal cortex showed cross-modal numerosity decoding during the response period.

Conclusions:

  • Parietal cortex is not essential for estimating sequential numerosity without a response.
  • Sensory cortices initially process numerosity, with parietal involvement emerging during active comparison.
  • Findings challenge the notion of a universal, sensory-independent parietal representation of numerosity.