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Finger-counting observation interferes with number processing.

A M Proverbio1, M Carminati1

  • 1Dept. of Psychology, University of Milano-Bicocca, Milan, Italy; Neuro-Mi Center for Neuroscience, University of Milano-Bicocca, Milan, Italy.

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Summary
This summary is machine-generated.

This study reveals a strong neural link between finger counting and number processing. Task-irrelevant hand gestures showing numbers interfere with arithmetic, highlighting this cognitive connection.

Keywords:
ArithmeticERNHandMirror neuronsNumber processing

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience of Mathematics
  • Human Computer Interaction

Background:

  • Finger counting is a common strategy for numerical tasks.
  • The neural underpinnings of the finger-number representation association are not fully understood.
  • Investigating this link can illuminate cognitive processes in arithmetic.

Purpose of the Study:

  • To investigate the association between finger and number representation during arithmetic calculations.
  • To determine if irrelevant finger-counting gestures interfere with arithmetic processing.
  • To explore the neural basis of this finger-digit processing link.

Main Methods:

  • Electroencephalography (EEG) and event-related potentials (ERPs) were recorded from 20 volunteers.
  • Participants performed arithmetic calculations and judged solution correctness.
  • Task-irrelevant hand gestures expressing numbers (congruent or incongruent) were presented.

Main Results:

  • P300 amplitude was larger for correct solutions.
  • Accuracy was higher with congruent finger gestures.
  • A numerical error-related negativity (nERN) occurred with incorrect solutions and incongruent gestures.
  • Source analysis indicated prefrontal cortex activity for error monitoring and occipital/temporal/somatosensory areas for attentional orienting.
  • The left angular gyrus (BA39) was active in both congruent and incongruent conditions, suggesting a shared processing pathway.

Conclusions:

  • A strict neural association exists between finger and digit processing.
  • Irrelevant finger-counting can interfere with arithmetic computation.
  • Findings support the explanation for Gerstmann syndrome, linking finger agnosia and acalculia to left parietal cortex lesions.