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Carrion crows cannot overcome impulsive choice in a quantitative exchange task.

Claudia A F Wascher1, Valerie Dufour, Thomas Bugnyar

  • 1Konrad Lorenz Forschungsstelle, University of Vienna Vienna, Austria.

Frontiers in Psychology
|April 25, 2012
PubMed
Summary
This summary is machine-generated.

Carrion crows can distinguish between food quantities but struggle with delaying gratification for more food. These birds prioritize quality over quantity in exchange tasks, unlike their known ability to optimize for quality.

Keywords:
Corvus corone coronecarrion crowsexchange taskimpulse controlquantity

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Area of Science:

  • Cognitive Ethology
  • Animal Behavior
  • Comparative Psychology

Background:

  • Self-control, the ability to delay gratification, was once considered uniquely human.
  • Non-human primates and some corvid species demonstrate self-control for higher quality or quantity rewards.
  • Previous corvid studies showed success with quality-based delays but not quantity-based delays.

Purpose of the Study:

  • To investigate carrion crows' capacity for overcoming impulsive choices in a quantitative exchange task.
  • To determine if crows' poor performance in quantity-based delays stems from quantity discrimination or value attribution.
  • To explore the cognitive mechanisms underlying delayed gratification in corvids.

Main Methods:

  • Carrion crows (Corvus corone corone) participated in a delayed gratification task involving exchanging a smaller food reward for a larger quantity of the same food after a short delay.
  • Six captive crows were tested, with three never exchanging and three exchanging at low rates.
  • A preference test was conducted to assess quantity discrimination and value assessment of different food amounts.

Main Results:

  • All tested crows could discriminate between different quantities of food and showed a preference for larger amounts.
  • Despite this ability, most crows did not exchange their initial reward for a larger quantity, indicating poor performance in this quantitative exchange task.
  • Individual differences were observed, with some crows exhibiting very low rates of exchange.

Conclusions:

  • Carrion crows possess the cognitive capacity to discriminate quantities and recognize higher value in larger amounts.
  • However, they appear to prioritize qualitative over quantitative outcomes in delayed gratification scenarios within this specific exchange paradigm.
  • This suggests a nuanced understanding of self-control in corvids, potentially differing between optimizing for quality versus quantity.