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Related Experiment Video

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Universal Screening for Prevention of Reading, Writing, and Math Disabilities in Spanish

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Published on: July 18, 2020

Grouping strategies in number estimation extend the subitizing range.

Paula A Maldonado Moscoso^1,2, Elisa Castaldi^3,4, David C Burr¹

¹Department of Neuroscience, Psychology, Pharmacology and Child Health, University of Florence, Florence, Italy.

Scientific Reports

|September 12, 2020

Summary

Groupitizing, the faster estimation of clustered items, relies on attention and the subitizing system. This attention-based process is crucial for accurate number perception and may correlate with math abilities.

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Area of Science:

Cognitive Psychology
Neuroscience
Developmental Psychology

Background:

Estimating numerosity is more accurate with clustered items than random distributions.
This phenomenon, termed 'groupitizing', is hypothesized to involve the subitizing system and basic arithmetic.

Purpose of the Study:

To investigate if the groupitizing advantage depends on the subitizing system.
To examine the role of attention in groupitizing by manipulating attentional load.

Main Methods:

Participants estimated numerosity of grouped and ungrouped arrays under full attention and dual-task conditions.
Attention was manipulated using a dual-task to divert cognitive resources.

Main Results:

Reduced attention significantly impaired estimation precision for grouped arrays but not ungrouped ones.
Numerosity estimation showed increased regression to the mean when attention was deprived.
Calculation skills correlated with precision for grouped arrays, suggesting a link to mathematical abilities.

Conclusions:

Groupitizing is an attention-dependent process that utilizes the subitizing system.
Numerosity estimation with grouped stimuli may serve as a sensitive indicator of mathematical abilities.