From the Age of 5 Humans Decide Economically, Whereas Crows Exhibit Individual Preferences.

Abstract:

:Human societies greatly depend on tools, which spare us considerable time and effort. Humans might have evolved a bias to employ tools, using them even when they are unnecessary. This study aimed to investigate whether adult humans and a distantly related habitually tool-using vertebrate species, the New Caledonian crow (Corvus moneduloides), use tools depending on their necessity. In addition, children aged 3 to 5 years were examined to investigate the developmental pattern. The task involved choosing between using a body part (i.e. crows: beak; humans: hand) or a tool for retrieving a reward from a box. All subjects were tested in two conditions. In the Body+/Tool- condition, using the body was more efficient than using the tool, and conversely in the Body-/Tool+ condition. Our results suggest that the capacity to employ tools economically develops late in humans. Crows, however, failed to choose economically. At the individual level, some subjects exhibited striking individual preferences for either using a tool or their beak throughout the task. Whether such biases depend on individual experience or whether they are genetically determined remains to be investigated. Our findings provide new insights about tool use and its cognitive implementation in two outstanding tool-using taxa.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Danel S,Osiurak F,von Bayern AMP

doi

10.1038/s41598-017-16984-0

subject

Has Abstract

pub_date

2017-12-06 00:00:00

pages

17043

issue

1

issn

2045-2322

pii

10.1038/s41598-017-16984-0

journal_volume

7

pub_type

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