Martin Schmelz

Martin Schmelz
Aktion Fischotterschutz e.V. · Otter-Zentrum Hankensbüttel

Dr. rer. nat.
Chimps. Ravens. Otters & Others. If you are interested in a paper, please contact me directly.

About

18
Publications
4,527
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441
Citations
Citations since 2016
12 Research Items
390 Citations
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2016201720182019202020212022020406080
2016201720182019202020212022020406080
Introduction
Chimps. Ravens. Otters & Others. I won't upload anything on researchgate. If you are interested in a paper, please contact me directly.

Publications

Publications (18)
Article
Full-text available
Enrichment can reduce stress and stereotypic behavior and therefore enhance captive animal welfare. In cognitive enrichment, cognitive tasks engage and challenge the animals' natural behavioral repertoire and provide mental stimulation. Enrichment with similarities to "puzzle boxes" in cognitive research is widespread in zoos but rarely applied in...
Article
Full-text available
Nonhuman great apes show remarkable behavioural flexibility. Some individuals are even able to use water as a tool: They spit water into a vertical tube to make a peanut float upwards until it comes into reach (floating peanut task; FPT). In the current study, we used the FPT to investigate how visual feedback, an end-state demonstration and a soci...
Article
In both the wild and captivity, chimpanzees engage in reciprocal patterns of prosocial behavior. However, the proximate mechanisms underlying these patterns are unclear. In the current study, we investigated whether chimpanzees prefer to act prosocially toward conspecifics who have directly benefited them (perhaps based on an affective bond) or whe...
Chapter
Theory of mind is defined as the ability to impute mental states to one self and others. This is not a precise definition as it encompasses various aspects of mental states. This entry covers the acquisition of these different aspects to a full‐fledged theory of mind in human children and the aspects of a theory of mind that can also be found in no...
Article
Full-text available
Cooperative problem solving has gained a lot of attention over the past two decades, but the range of species studied is still small. This limits the possibility of understanding the evolution of the socio-cognitive underpinnings of cooperation. Lutrinae show significant variations in socio-ecology, but their cognitive abilities are not well studie...
Article
Full-text available
For the past two decades, behavioural ecologists have documented consistent individual differences in behavioural traits within species and found evidence for animal “personality”. It is only relatively recently, however, that increasing numbers of researchers have begun to investigate individual differences in cognitive ability within species. It...
Article
Significance There are many examples of costly cooperation in humans. Although other great apes have been shown to engage in a number of cooperative behaviors, there is no reliable experimental evidence that they will sacrifice resources to benefit others. Here, we show that chimpanzees ( Pan troglodytes ) return favors to conspecifics who have pre...
Article
Full-text available
Although chimpanzees understand what others may see, it is unclear whether they understand how others see things (Level 2 perspective-taking). We investigated whether chimpanzees can predict the behavior of a conspecific which is holding a mistaken perspective that differs from their own. The subject competed with a conspecific over two food sticks...
Article
Cooperation and competition are two key components of social life. Current research agendas investigating the psychological underpinnings of competition and cooperation in non-human primates are misaligned. The majority of work on competition has been done in the context of theory of mind and deception, while work on cooperation has mostly focused...
Article
Cognition has been extensively studied in primates while other, more distantly related taxa have been neglected for a long time. More recently, there has been an increased interest in avian cognition, with the focus mostly on big-brained species like parrots and corvids. However, the majority of bird species has never systematically been studied in...
Article
In two experiments, we investigated whether chimpanzees, Pan troglodytes, can use self-experience to infer what another sees. Subjects first gained self-experience with the visual properties of an object (either opaque or see-through). In a subsequent test phase, a human experimenter interacted with the object and we tested whether chimpanzees unde...
Article
Humans often strategically manipulate the informational access of others to their own advantage. Although chimpanzees know what others can and cannot see, it is unclear whether they can strategically manipulate others' visual access. In this study, chimpanzees were given the opportunity to save food for themselves by concealing it from a human comp...
Article
Nonhuman great apes and human children were tested for an understanding that appearance does not always correspond to reality. Subjects were 29 great apes (bonobos [Pan paniscus], chimpanzees [Pan troglodytes], gorillas [Gorilla gorilla], and orangutans [Pongo abelii]) and 24 2½-year-old children. In our task, we occluded portions of 1 large and 1...
Article
Full-text available
The ability to predict how another individual will behave is useful in social competition. Chimpanzees can predict the behaviour of another based on what they observe her to see, hear, know and infer. Here we show that chimpanzees act on the assumption that others have preferences that match their own. All subjects began with a preference for a box...
Article
Full-text available
If chimpanzees are faced with two opaque boards on a table, in the context of searching for a single piece of food, they do not choose the board lying flat (because if food was under there it would not be lying flat) but, rather, they choose the slanted one- presumably inferring that some unperceived food underneath is causing the slant. Here we de...

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