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Articles 1 - 12 of 12
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Laterality Enhances Cognition In Australian Parrots, Maria Magat, Culum Brown
Laterality Enhances Cognition In Australian Parrots, Maria Magat, Culum Brown
Sentience Collection
Cerebral lateralization refers to the division of information processing in either hemisphere of the brain and is a ubiquitous trait among vertebrates and invertebrates. Given its widespread occurrence, it is likely that cerebral lateralization confers a fitness advantage. It has been hypothesized that this advantage takes the form of enhanced cognitive function, potentially via a dual processing mechanism whereby each hemisphere can be used to process specific types of information without contralateral interference. Here, we examined the influence of lateralization on problem solving by Australian parrots. The first task, a pebble-seed discrimination test, was designed for small parrot species that …
Octopus Insularis (Octopodidae), Evidences Of A Specialized Predator And A Time-Minimizing Hunter, Tatiana S. Leite, Manuel Haimovici, Jennifer A. Mather
Octopus Insularis (Octopodidae), Evidences Of A Specialized Predator And A Time-Minimizing Hunter, Tatiana S. Leite, Manuel Haimovici, Jennifer A. Mather
Sentience Collection
Shallow-water octopuses have been reported as major predators of motile species in benthonic marine communities, capturing their prey by different foraging techniques. This study assessed for the first time the feeding ecology, foraging behavior, and defensive strategy during foraging, including the use of body patterns, to construct a general octopus foraging strategy in a shallow water-reef system. Octopus insularis was studied in situ using visual observations and video recordings. The diet included at least 55 species of crustaceans (70%), bivalves (17.5%), and gastropods (12.5%); however, only four species accounted for half of the occurrences: the small crabs Pitho sp. (26.8%) …
Loss Of Shoaling Preference For Familiar Individuals In Captive-Reared Crimson Spotted Rainbowfish Melanotaenia Duboulayi, Erin Kydd, Culum Brown
Loss Of Shoaling Preference For Familiar Individuals In Captive-Reared Crimson Spotted Rainbowfish Melanotaenia Duboulayi, Erin Kydd, Culum Brown
Sentience Collection
Captive-reared rainbowfish Melanotonia duboulayi showed no preference for familiar individuals in an experiment examining shoaling preferences. Fortnightly re-examination of the shoaling preferences of the captive-reared population showed that the lack of preference for familiar individuals did not alter over an 8 week period. The same experiment performed on laboratory-reared offspring raised in isolated groups for 8 months since hatching also showed no preference for shoals consisting of familiar individuals. In contrast, trials performed on a wild population of M. duboulayi found a strong preference for familiar shoalmates, a result that is consistent with previous studies. The lack of shoaling preferences …
Animal Pleasure And Its Moral Significance, Jonathan Balcombe
Animal Pleasure And Its Moral Significance, Jonathan Balcombe
Sentience Collection
This paper presents arguments for, and evidence in support of, the important role of pleasure in animals’ lives, and outlines its considerable significance to humankind’s relationship to other animals. In the realms of animal sentience, almost all scholarly discussion revolves around its negative aspects: pain, stress, distress, and suffering. By contrast, the positive aspects of sentience – rewards and pleasures – have been rarely broached by scientists. Yet, evolutionary principles predict that animals, like humans, are motivated to seek rewards, and not merely to avoid pain and suffering. Natural selection favours behaviours that enhance survival and procreation. In the conscious, …
Quantitative And Qualitative Assessment Of The Response Of Foals To The Presence Of An Unfamiliar Human, Michela Minero, Maria Vittoria Tosi, Elisabetta Canali, Françoise Wemelsfelder
Quantitative And Qualitative Assessment Of The Response Of Foals To The Presence Of An Unfamiliar Human, Michela Minero, Maria Vittoria Tosi, Elisabetta Canali, Françoise Wemelsfelder
Sentience Collection
This work aimed to apply a combined qualitative and quantitative approach to the interpretation of an on-farm behaviour test for horses, and to examine whether 1 month of handling would affect the response of yearlings to an unfamiliar stationary human in their home environment. Throughout a 1-month period, 14 Thoroughbred Yearlings (16 ± 0.22 months old) that had formerly experienced minimal contact with humans, were handled daily for about 45 min. The yearlings were tested twice, just before and just after the handling period. The behaviour of the horses during the tests was both video-recorded and directly recorded by the …
Distress Or Suffering: What Should Be Measured To Determine Animal Well-Being?, Ian J. H. Duncan
Distress Or Suffering: What Should Be Measured To Determine Animal Well-Being?, Ian J. H. Duncan
Sentience Collection
It is generally accepted that all the vertebrates and some of the invertebrates (those with large neural ganglia such as the cephalopods) are capable of subjective experiences. Amongst those experiences are the subjective, affective states, sometimes called 'feelings' or 'emotions'. The strong negative feelings are often lumped together as 'suffering' and the positive feelings as 'pleasure'. I have argued for many years that animal welfare/well-being is completely dependent on what the animal feels (Duncan, 1993, 1996, 2002). An animal's well-being is decreased by experiencing suffering and increased by experiencing pleasure. It's as simple as that.
Recognition Of Distress In Animals – A Philosophical Prolegomenon, Bernard E. Rollin
Recognition Of Distress In Animals – A Philosophical Prolegomenon, Bernard E. Rollin
Sentience Collection
For those who continue to doubt the studiability of distress or suffering or misery in all of its forms in animals, consider the following thought experiment: If the government were to come up with a billion dollars in research funding for animal distress, would that money go a-begging? We can study these states just as we studied pain—excellent work on boredom by Franciose Wemelsfelder in a volume on laboratory animal welfare I co-edited made the methodology for such study quite explicit. (Wemelsfelder, 1990) And when the ideological scales fall from our eyes, we realize that the work of scientists like …
Distress In Animals: Its Recognition And A Hypothesis For Its Assessment, David B. Morton
Distress In Animals: Its Recognition And A Hypothesis For Its Assessment, David B. Morton
Sentience Collection
This essay deals with the recognition of non-painful emotional experiences in animals, how they relate to animal wellbeing and animal welfare, and how they can be assessed, monitored and mitigated. While it is written often from a mammalian perspective, the general principles will apply to all animals that are sentient.
Resources, Not Kinship, Determine Social Patterning In The Territorial Gunnison’S Prairie Dog (Cynomys Gunnisoni), J. L. Verdolin, C. N. Slobodchikoff
Resources, Not Kinship, Determine Social Patterning In The Territorial Gunnison’S Prairie Dog (Cynomys Gunnisoni), J. L. Verdolin, C. N. Slobodchikoff
Sentience Collection
In this study, we describe patterns of relatedness in Gunnison’s prairie dog (Cynomys gunnisoni) social groups. Kin selection is often cited as a mechanism for the evolution and maintenance of social groups, and Gunnison’s prairie dog females are occasionally described as being strongly philopatric. Overall, randomization tests revealed that females within territorial groups were not more closely related to each other than expected at random. A similar pattern was found among males and between males and females, indicating that there was no sex-biased dispersal occurring in these populations. Ecological variables measured in this study, such as food abundance and food …
Constructive And Deconstructive Tool Modification By Chimpanzees (Pan Troglodytes), Amanda E. Bania, Stephany Harris, Hannah R. Kinsley, Sarah T. Boysen
Constructive And Deconstructive Tool Modification By Chimpanzees (Pan Troglodytes), Amanda E. Bania, Stephany Harris, Hannah R. Kinsley, Sarah T. Boysen
Sentience Collection
Nine chimpanzees (Pan troglodytes) were tested for their ability to assemble or disassemble the appropriate tool to obtain a food reward from two different apparatus. In its deconstructed form, the tool functioned as a probe for one apparatus. In its constructed form, the tool functioned as a hook, appropriate for a second apparatus. Each subject completed four test trials with each apparatus type. Tool types were randomized and counter-balanced between the two forms. Results demonstrated that adult and juvenile chimpanzees (N = 7) were successful with both tool types, while two infant chimpanzees performed near chance. Off-line video analyses revealed …
Understanding Norms Without A Theory Of Mind, Kristin Andrews
Understanding Norms Without A Theory Of Mind, Kristin Andrews
Sentience Collection
I argue that having a theory of mind requires having at least implicit knowledge of the norms of the community, and that an implicit understanding of the normative is what drives the development of a theory of mind. This conclusion is defended by two arguments. First I argue that a theory of mind likely did not develop in order to predict behavior, because before individuals can use propositional attitudes to predict behavior, they have to be able to use them in explanations of behavior. Rather, I suggest that the need to explain behavior in terms of reasons is the primary …
Politics Or Metaphysics? On Attributing Psychological Properties To Animals, Kristin Andrews
Politics Or Metaphysics? On Attributing Psychological Properties To Animals, Kristin Andrews
Sentience Collection
Following recent arguments that there is no logical problem with attributing mental or agential states to animals, I address the epistemological problem of how to go about making accurate attributions. I suggest that there is a two-part general method for determining whether a psychological property can be accurately attributed to a member of another species: folk expert opinion and functionality. This method is based on well-known assessments used to attribute mental states to humans who are unable to self-ascribe due to an early stage of development or impairment, and can be used to describe social and emotional development as well …