| 1. |
- Jacobs, Ivo, et al.
(författare)
-
The Development of Sensorimotor Cognition in Common Ravens (Corvus corax) and its Comparative Evolution
- 2019
-
Ingår i: Animal behavior and cognition. - 2372-5052. ; 6:3, s. 194-212
-
Tidskriftsartikel (refereegranskat)abstract
- Evolution involves developmental change. Species comparisons play an important role in comparative cognition because they can uncover common patterns and shared principles in cognitive evolution. Developmental studies reveal foundational elements of cognitive abilities and how they are constructed and integrated. Sensorimotor cognition is such a key element that forms the foundation for later-developing cognitive skills, yet little is known about its development in animals. This study uses 37 behaviors and tasks to investigate the development of Piagetian sensorimotor abilities in five young ravens (Corvus corax) from ages two to eleven weeks. Their developmental pattern largely mirrored that of twelve other bird and mammal species, albeit at a markedly accelerated rate. They reached the final sensorimotor stage, which to date has been shown only in great apes. The onset and sequence of sensorimotor development was identical for all species. Absolute number of neurons in the pallium and rest of brain was associated with achieving a higher stage across these species. This was not the case for absolute or relative brain mass, or number of neurons in the cerebellum or whole brain. We discuss the independent evolution of sensorimotor cognition and the importance of developmental pace and pattern therein. These findings show that the study of sensorimotor development is a useful tool for comparative cognition research.
|
|
| 2. |
- Osvath, Mathias, et al.
(författare)
-
An Exploration of Play Behaviors in Raven Nestlings
- 2014
-
Ingår i: Animal behavior and cognition. - : Animal Behavior and Cognition. - 2372-5052 .- 2372-4323. ; 1:2, s. 157-165
-
Tidskriftsartikel (refereegranskat)abstract
- Play is widespread among vertebrates. Some animal groups stand out in their play behaviors in levels of complexity, innovativeness, sociality, and volume. Despite the vast phylogenetic distance between corvids, parrots, great apes, and dolphins, all are usually identified as among the most playful. These groups also have several complex cognitive skills in common. There is growing agreement that play has evolved multiple times under different selective pressures in different lineages. As these groups appear similar in their complex play but are separated by considerable evolutionary distance, the similarity is unlikely to result from homology. Far more probable is that the similarity has arisen from convergent or parallel evolution. It is important to conduct comparative ontogenetic play studies on these groups to learn more about what basic processes underlie complex play and whether such play is, indeed, related to complex cognition. Toward that end, we explored the play behavior of raven nestlings over the last ten days before they fledged. We found high levels of play both in terms of instances initiated and duration. The play behaviors were at level with – or above – maintenance behaviors and flight training. Most of the play was object play, but social object play and apparent play contagion was also recorded. The importance of play in developing young ravens is clear. The reasons might be less clear, however play could underlie both object-related and social development.
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
|
|
| 6. |
|
|
| 7. |
|
|
| 8. |
- Gärdenfors, Peter, et al.
(författare)
-
The tripod effect : Evolutionary perspectives on cooperation, cognition and communication
- 2012
-
Ingår i: New perspectives on the symbolic species. - Dordrecht : Springer Netherlands. - 1875-4651. - 9789400723351 - 9789400723368 ; 6, s. 193-224
-
Bokkapitel (refereegranskat)abstract
- This article concerns the co-evolution of hominin cooperation, communication and cognition. Certain hominin ecologies seem to have relied on cognitive foresight. The capacity of planning for future needs, combined with more developed cooperative skills, opened up the cognitive niche of cooperation towards future goals. Such cooperation requires complex intersubjectivity (theory of mind). We analyze five domains of intersubjectivity: emotion, desire, attention, intention, and belief; and argue that cooperation towards future goals requires, among other things, joint intentions (we-intentions). We scrutinize the cognitive and communicative conditions for reciprocal altruism, found in some species; and indirect reciprocity, a form of cooperation typical in the hominin line.Sharing intentions and beliefs about the future requires communication about what is not present in the current environment. Symbols are efficient tools for this kind of communication, and we argue that the benefits of cooperation for the future selected for the evolution of symbolic communication. In line with recent models describing how indirect reciprocity might develop into an evolutionarily stable strategy, we emphasize the need for yet more complex intersubjectivity and symbolic communication, including a minimal syntax.Our argumentation triangulates hominin cognition, cooperation, and communication, showing how these interdependent factors mutually reinforce each other over the course of evolution. The new take in this article is the combined analyses of cooperation and cognitive mechanisms. Finally, our theses are linked to archaeological evidence.
|
|
| 9. |
|
|
| 10. |
- Jacobs, Ivo, et al.
(författare)
-
Object caching in corvids: Incidence and significance.
- 2014
-
Ingår i: Behavioural Processes. - : Elsevier BV. - 0376-6357. ; 102, s. 25-32
-
Tidskriftsartikel (refereegranskat)abstract
- Food caching is a paramount model for studying relations between cognition, brain organisation and ecology in corvids. In contrast, behaviour towards inedible objects is poorly examined and understood. We review the literature on object caching in corvids and other birds, and describe an exploratory study on object caching in ravens, New Caledonian crows and jackdaws. The captive adult birds were presented with an identical set of novel objects adjacent to food. All three species cached objects, which shows the behaviour not to be restricted to juveniles, food cachers, tool-users or individuals deprived of cacheable food. The pattern of object interaction and caching did not mirror the incidence of food caching: the intensely food caching ravens indeed showed highest object caching incidence, but the rarely food caching jackdaws cached objects to similar extent as the moderate food caching New Caledonian crows. Ravens and jackdaws preferred objects with greater sphericity, but New Caledonian crows preferred stick-like objects (similar to tools). We suggest that the observed object caching might have been expressions of exploration or play, and deserves being studied in its own right because of its potential significance for tool-related behaviour and learning, rather than as an over-spill from food-caching research. This article is part of a Special Issue entitled: CO3 2013.
|
|
