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Related Experiment Videos

Parallel non-verbal enumeration is constrained by a set-based limit.

Lisa Feigenson1

  • 1Department of Psychological & Brain Sciences, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA. feigenson@jhu.edu

Cognition
|September 1, 2007
PubMed
Summary
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Adults can simultaneously count up to three different types of objects, even when mixed together. This parallel enumeration ability is limited by working memory capacity, suggesting each counted set requires a memory slot.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Perception

Background:

  • Adults possess an approximate number system (ANS) for representing quantities, independent of language.
  • The ANS can discriminate and compare various entities like dots, sounds, or actions.

Purpose of the Study:

  • To investigate whether adults can enumerate multiple, distinct types of entities in parallel.
  • To determine the capacity limit for simultaneous enumeration of temporally intermixed sets.

Main Methods:

  • Participants observed hidden sequences of objects (1-5 types) with varied features (category, color, shape, texture) in two locations.
  • Verbal counting was prevented to isolate non-verbal enumeration.
  • Participants were queried on the number of objects of each type per location.

Related Experiment Videos

Main Results:

  • Successful enumeration of object types occurred for 1-3 types presented.
  • Enumeration failed when 4 or 5 types were presented, irrespective of total object count.
  • This parallel enumeration occurred without training and for objects in distinct locations.

Conclusions:

  • Adults can perform simultaneous enumeration of multiple, temporally intermixed sets, but are limited to a capacity of three sets.
  • This three-set limit aligns with the widely observed three-item capacity limit in working memory.
  • The findings suggest that parallel enumeration requires dedicated working memory slots for storage before enumeration can proceed.