| 1. |
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| 2. |
- Jacobs, Ivo, et al.
(författare)
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Object caching in corvids: Incidence and significance.
- 2014
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Ingår i: Behavioural Processes. - : Elsevier BV. - 0376-6357. ; 102, s. 25-32
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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.
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| 3. |
- Osvath, Mathias, et al.
(författare)
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An Exploration of Play Behaviors in Raven Nestlings
- 2014
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Ingår i: Animal behavior and cognition. - : Animal Behavior and Cognition. - 2372-5052 .- 2372-4323. ; 1:2, s. 157-165
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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.
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| 4. |
- Osvath, Mathias, et al.
(författare)
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Chimpanzee (Pan troglodytes) and orangutan (Pongo abelii) forethought: self-control and pre-experience in the face of future tool use.
- 2008
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Ingår i: Animal Cognition. - : Springer Science and Business Media LLC. - 1435-9456 .- 1435-9448. ; 11:4, s. 661-674
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Tidskriftsartikel (refereegranskat)abstract
- Planning for future needs has traditionally been considered to be restricted to human cognition. Although recent studies on great ape and corvid cognition challenge this belief, the phylogenesis of human planning remains largely unknown. The complex skill for future planning has not yet been satisfactorily established in any other extant primate species than our own. In humans, planning for future needs rely heavily on two overarching capacities, both of which lie at the heart of our cognition: self-control, often defined as the suppression of immediate drives in favor of delayed rewards, and mental time travel, which could be described as a detached mental experience of a past or future event. Future planning is linked to additional high complexity cognition such as metacognition and a consciousness usually not attributed to animals. In a series of four experiments based on tool use, we demonstrate that chimpanzees (Pan troglodytes) and orangutans (Pongo abelii) override immediate drives in favor of future needs, and they do not merely rely on associative learning or semantic prospection when confronted with a planning task. These results suggest that great apes engage in planning for the future by out competing current drives and mentally pre-experiencing an upcoming event. This suggests that the advanced mental capacities utilized in human future planning are shared by phylogenetically more ancient species than previously believed.
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| 5. |
- Bobrowicz, Katarzyna, et al.
(författare)
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Cats parallel great apes and corvids in motor self-regulation, but size matters
- 2017
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- We tested domestic cats in the cylinder task, and found that they perform better ifthe cylinder is larger. We also found that their highest performance parallels that ofgreat apes and corvids, which are known as the best performing animals on this task.The cylinder task is used to test animals’ motor self-regulation. Recently a large-scalestudy tested 36 species on the task and found that absolute brain size correlatedwith the performance; with great apes as top performers. Another study showedthat corvids perform as good as great apes despite having smaller absolute brainsize. We questioned whether average brained animals have as poor motor self-regulation as suggested, as it appears highly maladaptive; instead the results couldbe a reflection of the sensorimotor set-up of different species in relation to thematerials used. No cats have been tested on the task before.Eight adult domestic cats participated in four versions of the task. We manipulatedthe size and materials, with two large (18.5 cm diameter) and two small (9.5 cmdiameter) cylinders, out of glass and plastic respectively. Each condition comprisedof two phases. First, a subject learned to retrieve a reward from an opaque cylinder(5 trials), and after a 24-hour delay was tested on a transparent cylinder (10 trials). Aretrieval of the reward without touching the cylinder’s front counted as a successfultrial.The success rate differed between conditions, and was highest (98,75) for the “smallplastic” condition. There was a significant main effect of the cylinder size on thesuccess rate [F(1,7)=64.06, p <0.001]. We discuss these results, as they call intoquestion whether the large-scale study took into account the sensorimotorarchitecture of each species, and more importantly, whether the task alwaysmeasures motor self-regulation.
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| 6. |
- Bobrowicz, Katarzyna, et al.
(författare)
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Cats Parallel Great Apes and Corvids in Motor Self-Regulation – Not Brain but Material Size Matters
- 2018
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Ingår i: Frontiers in Psychology. - : Frontiers Media SA. - 1664-1078.
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Tidskriftsartikel (refereegranskat)abstract
- The inhibition of unproductive motor movements is regarded as a fundamental cognitive mechanism. Recently it has been shown that species with large absolute brain size or high numbers of pallial neurons, like great apes and corvids, show the highest performance on a task purportedly measuring this mechanism: the cylinder task. In this task the subject must detour a perpendicularly oriented transparent cylinder to reach a reward through a side opening, instead of directly reaching for it and bumping into the front, which is regarded as an inhibitory failure. Here we test domestic cats, for the first time, and show that they can reach the same levels as great apes and corvids on this task, despite having much smaller brains. We tested subjects with apparatuses that varied in size (cylinder length and diameter) and material (glass or plastic), and found that subjects performed best on the large cylinders. As numbers of successes decreased significantly when the cylinders were smaller, we conducted additionally two experiments to discern which properties (length of the transparent surface, goal distance from the surface, size of the side opening) affects performance. We conclude that sensorimotor requirements, which differ between species, may have large impact on the results in such seemingly simple and apparently comparable tests. However, we also conclude that cats have comparably high levels of motor self-regulation, despite the differences between tests.
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| 7. |
- Bobrowicz, Katarzyna, et al.
(författare)
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Cognition in the fast lane : ravens’ gazes are half as short as humans’ when choosing objects
- 2019
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Ingår i: Animal behavior and cognition. - : Animal Behavior and Cognition. - 2372-4323 .- 2372-5052. ; 6:2, s. 81-97
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Tidskriftsartikel (refereegranskat)abstract
- Time cannot be directly perceived; instead, its flow is inferred from the influx of sensory information. To prevent sensory overload, attentional mechanisms split up information into processable units. This portioning remains imperceptible to the individual. However, the length of these units still influences the speed of perception and the speed at which behaviors are performed. Previous studies have focused on establishing the length of these units in various mammalian species – mainly humans – by measuring different types of behaviors, including gaze. However, no such studies have been conducted on birds. We measured duration of ravens’ (Corvus corax) single gazes towards selectable objects before a choice was made, and compared it with humans in a similar set up. The raven gaze durations were approximately half those of humans (which fell slightly short of previously established ranges). We hypothesize that these differences are mainly due to the much higher so-called flicker-fusion-frequency in birds, which makes their vision faster in the sense that it picks up more information per time unit than mammalian vision does. We further discuss that the speed of perception might influence the general speed of cognitive processing in more complex tasks as well, and suggest that the addition of a temporal component in comparative cognitive studies might be informative.
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| 8. |
- Bobrowicz, Katarzyna, et al.
(författare)
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Cylinder size affects cat performance in the motor self-regulation task
- 2017
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- We tested domestic cats in the so-called cylinder task, and found that they perform better if the cylinder is larger. We also found that their highest performance parallels that of great apes and corvids, which are known as the best performing animals on this task. The cylinder task is used to test animals’ motor self-regulation: the inhibition of unproductive, but prepotent, movements in favour of productive movements that require a slight detour. Recently a large-scale study tested 36 species on this task and found that absolute brain size correlate with the performance; with great apes as top performers. Another study showed that corvids perform as good as great apes despite having smaller absolute brain size. We questioned whether average brained animals has as poor motor self-regulation as suggested, as it appears highly maladaptive; instead the results could be a reflection of the sensorimotor set-up of different species in relation to the materials used. No cats has yet been tested on the task. As ambush and sneak hunters, cats would arguably have high levels of motor self-regulation, but on the other hand their brain size and neuronal numbers are not above average in mammals. Eight adult domestic cats were tested in four versions of the task. We manipulated the size and materials to test whether that influenced performance: two large cylinders (16 cm diameter) out of glass and plastic respectively, and two small cylinders (9 cm diameter) of the same two materials. Each of the four conditions had two phases with a 24-hour delay in between. Each phase consisted of 10 consecutive trials. On the first day, a subject learned to retrieve a reward from an opaque cylinder. Next day, the cat was tested on a transparent cylinder. A retrieval of the reward without touching the cylinder’s front counted as a successful trial. The success rate differed between conditions, and reached 98.75% in the ‘big glass’ condition, and 97.5% in the ‘big plastic’ condition, and 83.75% in the ‘small glass’, and finally 73.75% in the ‘small plastic’ condition. Two-Factor ANOVA for two within variables revealed a significant main effect of the cylinder size on the success rate [F(1,7)=64.06, P<0.001]. Neither a main effect of the material nor an interaction effect of size and material was statistically significant. The size effect was seen in all subjects. Failure rates did not decrease over time in any condition, so no learning curve was detected. Our results show that cats parallel great apes and corvids in the cylinder task as long as it is 16 cm in diameter and made of glass, despite their average mammalian neural characteristics. There are several possible explanations such as that a bigger size allows for more options of retrieval (e.g. mouth or paw), and/or requires less precise retrieval; it could also be that the distance to the reward is perceived as different. This calls into question whether the large-scale study took into account the sensorimotor architecture of each species, and more importantly, whether the task always measures motor self-regulation.
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| 9. |
- Bobrowicz, Katarzyna, et al.
(författare)
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Goffin's Cockatoos (Cacatua goffiniana) Can Solve a Novel Problem After Conflicting Past Experiences
- 2021
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Ingår i: Frontiers in Psychology. - : Frontiers Media SA. - 1664-1078.
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Tidskriftsartikel (refereegranskat)abstract
- Novel problems often partially overlap with familiar ones. Some features match the qualities of previous situations stored in long-term memory and therefore trigger their retrieval. Using relevant, while inhibiting irrelevant, memories to solve novel problems is a hallmark of behavioral flexibility in humans and has recently been demonstrated in great apes. This capacity has been proposed to promote technical innovativeness and thus warrants investigations of such a mechanism in other innovative species. Here, we show that proficient tool—users among Goffin's cockatoos—an innovative tool—using species—could use a relevant previous experience to solve a novel, partially overlapping problem, even despite a conflicting, potentially misleading, experience. This suggests that selecting relevant experiences over irrelevant experiences guides problem solving at least in some Goffin's cockatoos. Our result supports the hypothesis that flexible memory functions may promote technical innovations.
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| 10. |
- Bobrowicz, Katarzyna, et al.
(författare)
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Great apes selectively retrieve relevant memories to guide action
- 2020
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Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322.
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Tidskriftsartikel (refereegranskat)abstract
- Memory allows us to draw on past experiences to inform behaviour in the present. However, memories rarely match the situation at hand exactly, and new situations regularly trigger multiple related memories where only some are relevant to act upon. The flexibility of human memory systems is largely attributed to the ability to disregard irrelevant, but salient, memories in favour of relevant ones. This is considered an expression of an executive function responsible for suppressing irrelevant memories, associated with the prefrontal cortex. It is unclear to what extent animals have access to this ability. Here, we demonstrate, in a series of tool-use tasks designed to evoke conflicting memories, that chimpanzees and an orangutan suffer from this conflict but overcome it in favour of a more relevant memory. Such mnemonic flexibility is among the most advanced expressions of executive function shown in animals to date and might explain several behaviours related to tool-use, innovation, planning and more.
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