Two experiments investigated the processing of global and local information by pigeons. In Experiment 1, pigeons were trained to discriminate four hierarchical stimuli composed of two letters at global level and two other letters at local level. C...
Arithmetic-like reasoning has been demonstrated in various animals in captive and seminatural environments, but it is unclear whether such competence is practiced in the wild. Using a hypothetical foraging paradigm, we demonstrate that wild vervet...
A comparative study was conducted to investigate whether the search for a target letter was facilitated when the target and prime (preceding stimulus) letters were identical. Pigeons (Section 2) and human participants (Section 3) were first traine...
We conducted three experiments to investigate how object-based components contribute to the attentional processes of chimpanzees and to examine how such processes operate with regard to perceptually structured objects In Experiment 1. chimpanzees ...
In our target article published in the latest special issue of the Japanese Journal of Animal Psychology, we proposed a new framework of species comparison for studies of animal psychology in which the generalist and evolutionist approaches...