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The (Spatial) Memory Game: Testing the Relationship Between Spatial Language, Object Knowledge, and Spatial Cognition
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Spatial orienting biases in the decimal numeral system.

Fabrizio Doricchi1, Sheila Merola, Marilena Aiello

  • 1Fondazione Santa Lucia IRCCS, Roma, Italy. fabrizio.doricchi@uniroma1.it

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Humans mentally represent numbers on a number line, but systematically misjudge interval midpoints near tens. This study reveals how number grouping impacts our spatial understanding of numerical magnitudes.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Numerical Cognition

Background:

  • Humans utilize a mental number line (MNL) for number representation, with smaller integers to the left of larger ones.
  • The spatial arrangement of numbers on the MNL is influenced by cultural and developmental factors, including the decimal system.

Purpose of the Study:

  • To investigate systematic biases in subjective number interval bisection along the mental number line.
  • To explore how the grouping of numbers within tens affects the perception of numerical magnitudes.

Main Methods:

  • Adult participants performed number interval bisection tasks.
  • Right-brain-damaged patients with spatial neglect were also assessed to understand MNL lateralization.

Main Results:

  • Participants systematically shifted subjective midpoints away from tens boundaries.
  • Intervals near the start of a decade were bisected further right, and near the end, further left.
  • Right-brain-damaged patients exhibited altered bisection patterns consistent with MNL neglect.

Conclusions:

  • The recursive grouping of decimal numerals within tens influences the spatial representation of numerical magnitudes.
  • These findings highlight the interplay between symbolic number processing and underlying spatial representations.