Ignorant hooded crows follow knowledgeable roost-mates to food: support for the information centre hypothesis

Ignorant hooded crows follow knowledgeable roost-mates to food: support for the information centre hypothesis.

Communal roosting in birds may function to enhance foraging efficiency as explained by the information centre hypothesis, which predicts that successful foragers return from the roost to the rewarding food patch and that birds ignorant of this food follow knowledgeable roost-mates. We tested these predictions by exposing 34 radio-tagged, free-ranging, flock-living hooded crows (Corvus corone co...

Preschoolers expect pointers (even ignorant ones) to be knowledgeable.

Twelve-month-olds communicate helpfully and appropriately for knowledgeable and ignorant partners.

In the current study we investigated whether 12-month-old infants gesture appropriately for knowledgeable versus ignorant partners, in order to provide them with needed information. In two experiments we found that in response to a searching adult, 12-month-olds pointed more often to an object whose location the adult did not know and thus needed information to find (she had not seen it fall do...

The Genetics of Speciation and Colouration in Carrion and Hooded Crows

Poelstra, J. 2013. The Genetics of Speciation and Colouration in Carrion and Hooded Crows. Acta Universitatis Upsaliensis. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1088. 48 pp. Uppsala. ISBN 978-91-554-8777-5. A fundamental goal in biological research is to gain an understanding of the evolutionary processes and genetic elements that dr...

Learning words from knowledgeable versus ignorant speakers: links between preschoolers' theory of mind and semantic development.

Two studies addressed whether children consider speakers' knowledge states when establishing initial word-referent links. In Study 1, forty-eight 3- and 4-year-olds were taught two novel words by a speaker who expressed either knowledge or ignorance about the words' referents. Children showed better word learning when the speaker was knowledgeable. In Study 2, forty-eight 3- and 4-year-olds wer...