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Simultaneous and sequential subitizing are separate systems, and neither predicts math abilities.

Giovanni Anobile1, Roberto Arrighi2, David C Burr3

  • 1Department of Developmental Neuroscience, Stella Maris Scientific Institute, 56018 Calambrone (Pisa), Italy.

Journal of Experimental Child Psychology
|November 1, 2018
PubMed
Summary
This summary is machine-generated.

Subitizing, the rapid estimation of small quantities, does not generalize across different formats or senses. Subitizing limits in children and adults do not correlate with math abilities, suggesting separate systems for different types of subitizing.

Keywords:
Approximate number systemCross-modal perceptionDyscalculiaNumerical cognitionNumerositySubitizing

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Area of Science:

  • Cognitive Psychology
  • Developmental Psychology
  • Neuroscience

Background:

  • Subitizing is the accurate and rapid enumeration of small quantities.
  • The error rate in estimating larger quantities predicts mathematical abilities.
  • The generalizability of subitizing across modalities and formats, and its relation to numerical cognition, remain unclear.

Purpose of the Study:

  • To investigate whether subitizing generalizes across sensory modalities (visual, auditory) and stimulus formats (simultaneous, sequential).
  • To determine if subitizing limits correlate with mathematical abilities in primary school children and adults.

Main Methods:

  • Subitizing limits were assessed in children and adults using visual and auditory stimuli.
  • Stimuli were presented either sequentially (flashes, sounds) or simultaneously (dot arrays).
  • Correlations between subitizing limits and measures of mental calculation and digit magnitude knowledge were analyzed.

Main Results:

  • Adults exhibited slightly larger subitizing limits than children across all conditions.
  • Subitizing of simultaneous visual stimuli (dot arrays) was more accurate than sequential visual stimuli (flashes).
  • Subitizing limits for dot arrays did not correlate with those for flashes or sounds, but sequential flash and sound subitizing were correlated in children.
  • Subitizing limits showed no correlation with mental calculation or digit magnitude knowledge proficiency.

Conclusions:

  • Subitizing may involve distinct systems for simultaneous and sequential processing, and across different sensory modalities.
  • Subitizing appears to be independent of broader numerical abilities and mathematical proficiency.
  • Findings suggest that early numerical skills might rely on processes distinct from subitizing.