Dogs’ use of the solidity principle: revisited

An end to insight? New Caledonian crows can spontaneously solve problems without planning their actions

(2012) A. H. Taylor et al.   PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

Chimpanzee problem-solving: contrasting the use of causal and arbitrary cues

(2011) Daniel Hanus et al.   ANIMAL COGNITION

An Investigation into the Cognition Behind Spontaneous String Pulling in New Caledonian Crows

(2010) Alex H. Taylor et al.   PLoS One

Domesticated dogs’ (Canis familiaris) use of the solidity principle

(2009) Shannon M. A. Kundey et al.   ANIMAL COGNITION

Comparing dogs and great apes in their ability to visually track object transpositions

(2009) Eveline F. Rooijakkers et al.   ANIMAL COGNITION

Gravity and solidity in four great ape species (Gorilla gorilla, Pongo pygmaeus, Pan troglodytes, Pan paniscus): Vertical and horizontal variations of the table task.

(2009) Trix Cacchione et al.   JOURNAL OF COMPARATIVE PSYCHOLOGY

The importance of proving the null.

(2009) C. R. Gallistel   PSYCHOLOGICAL REVIEW