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Crows and primates possess similar working memory capacities, estimated at four items. This suggests convergent evolution of high-level cognitive abilities in both species, challenging previous assumptions about avian intelligence.

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Area of Science:

  • Comparative cognition
  • Neuroscience
  • Avian intelligence

Background:

  • Working memory is crucial for cognition, enabling information maintenance and manipulation.
  • Its capacity is limited and linked to intelligence in humans.
  • While birds and mammals share neural principles, working memory capacity in crows remains largely untested.

Purpose of the Study:

  • To compare the 'bandwidth of cognition' between crows and primates.
  • To investigate the working memory capacity in carrion crows.
  • To explore the evolutionary convergence of cognitive abilities.

Main Methods:

  • Adapted a working memory paradigm from a rhesus monkey study.
  • Tested the performance of two carrion crows on the paradigm.
  • Estimated working memory capacity in items.

Main Results:

  • Carrion crows demonstrated a working memory capacity remarkably similar to primates, estimated at approximately four items.
  • Both species exhibited largely independent capacity in their visual hemifields.
  • This indicates a high-capacity working memory in crows.

Conclusions:

  • Crows, like primates, have evolved high-capacity working memory.
  • This finding highlights convergent evolution of advanced cognitive functions in distantly related species.
  • Suggests that avian and primate cognitive architectures for working memory share fundamental similarities.