Comparative Psychology Commons^™

Capuchins (Cebus Apella) Can Solve A Means-End Problem, Anna M. Yocom, Sarah T. Boysen

Sentience Collection

Three capuchin monkeys (Cebus apella) were tested on a 2-choice discrimination task designed to examine their knowledge of support, modeled after Hauser, Kralik, and Botto-Mahan’s (1999) experiments with tamarins. This task involved a choice between 2 pieces of cloth, including 1 with a food reward placed on its surface, and a second cloth with the food reward next to its surface. After reliably solving the basic problem, the capuchins were tested with various alternations of the original food reward and cloth. The capuchins were able to solve the initial task quickly, and generalize their knowledge to additional functional and nonfunctional …

An Examination Of Aggressive Behavior In Indo-Pacific Bottlenose Dolphins (Tursiops Aduncus), Lauren Elizabeth Miller

Master's Theses

Agonistic behavior is often observed in animal groups in which individuals have long-term relationships. Although bottlenose dolphins (Tursiops sp.) are known to behave aggressively, relatively little is known about such behavior among wild animals. Much of the data on delphiilid aggression comes from captive studies, and is likely biased by the limited space available to the animals. In this study, video data collected from 1997 to 2007 were analyzed to examine aggressive behaviors in a wild population of Indo-Pacific bottlenose dolphins (Tursiops aduncus) off the coast ofMikura Island, Japan. The purpose of the study was to determine if age class, …

Site Fidelity And Association Patterns Of Bottlenose Dolphins (Tursiops Truncatus In The Mississippi Sound, Angela D. Mackey

Master's Theses

The current study examined the site fidelity and association patterns of a community of 678 wild bottlenose dolphins (Tursiops truncatus) in the Mississippi Sound (Sound) over a three-year period (May 2004 - April 2007). Using photoidentification techniques, 74% (n = 498) of the identified dolphins were classified as transients, while 10% (n = 71) were classified as year-round residents, and 16% (n = 109) were classified as seasonal residents based on their sighting histories. Thirty-nine "select" dolphins (n = 17 seasonal residents, n = 22 yearround residents) that were sighted five or more times over the study period were used …

Variation In Social Behavior Throughout The Estrous Cycle Of A Captive Killer Whale Orcinus Orca, Kristina Marie Horback

Master's Theses

The study of cetaceans in captivity provides information on behavior, acoustics, reproduction and physiology that is often difficult to obtain with free-ranging populations. The present study examined the influence of the estrous cycle of a captive female killer whale on the rate, duration, initiation and reception of social behavior she performed with her only pool mate, a male Atlantic bottlenose dolphin. Although these two delphinid species do not commonly associate in the wild, these pool mates often engaged in affiliative tactile and social behaviors. The objectives of this project were to: (a) examine the influence of cycli~ gonadal steroid hormones …

Changes In Area Affect Figure–Ground Assignment In Pigeons, Leyre Castro, Olga F. Lazareva, Shaun P. Vecera, Edward A. Wasserman

Perception Collection

A critical cue for figure–ground assignment in humans is area: smaller regions are more likely to be perceived as figures than are larger regions. To see if pigeons are similarly sensitive to this cue, we trained birds to report whether a target appeared on a colored figure or on a differently colored background. The initial training figure was either smaller than (Experiments 1 and 2) or the same area as (Experiment 2) the background. After training, we increased or decreased the size of the figure. When the original training shape was smaller than the background, pigeons’ performance improved with smaller …

Octopuses (Enteroctopus Dofleini) Recognize Individual Humans, Roland C. Anderson, Jennifer A. Mather, Mathieu Q. Monette, Stephanie R.M. Zimsen

Sentience Collection

This study exposed 8 Enteroctopus dofleini separately to 2 unfamiliar individual humans over a 2-week period under differing circumstances. One person consistently fed the octopuses and the other touched them with a bristly stick. Each human recorded octopus body patterns, behaviors, and respiration rates directly after each treatment. At the end of 2 weeks, a body pattern (a dark Eyebar) and 2 behaviors (reaching arms toward or away from the tester and funnel direction) were significantly different in response to the 2 humans. The respiration rate of the 4 larger octopuses changed significantly in response to the 2 treatments; …

Squid Dances: An Ethogram Of Postures And Actions Of Sepioteuthis Sepioidea Squid With A Muscular Hydrostatic System, Jennifer A. Mather, Ulrike Griebel, Ruth A. Byrne

Sentience Collection

A taxonomy of the movement possibilities for any species, within the constraints of its neural and skeletal systems, should be one of the foundations of the study of its behaviour. Caribbean reef squid, Sepioteuthis sepioidea, appear to have many degrees of freedom in their movement as they live in a three-dimensional habitat and have no fixed skeleton but rather a muscular hydrostatic one. Within this apparent lack of constraints, there are regularities and patterns of common occurrences that allow this article to describe an ethogram of the movements, postures and positions of squid. Squid have a combination of bent, …

Vigilance And Antipredator Responses Of Caribbean Reef Squid, Jennifer A. Mather

Sentience Collection

Antipredator responses, especially those of open-ocean squid, have been seldom studied in the natural environment. Sepioteuthis sepioidea, observed by snorkellers near the shore in early morning/late afternoon, produced an average of eight moves of over 1m per hour, apparently mostly antipredator behaviours. Close approaches by herbivorous parrotfish elicited no response in 74% of encounters; otherwise, squid produced agonistic zebra stripes or startle-mantle-dots skin patterns. Predatory bar jack fish caused flight but not zebra displays, and squid usually paled and fled quickly (66%) from snapper. The speed of approach was the best predictor for flight and display responses to snapper, …

Male Territoriality In A Social Sciurid, Cynomys Gunnisoni: What Do Patterns Of Paternity Tell Us?, J. L. Verdolin, C. N. Slobodchikoff

Veterinary Science and Medicine Collection

In many social sciurids, male territoriality confers significant mating advantages. We evaluated resident male paternity in Gunnison’s prairie dogs (Cynomys gunnisoni), a colonial ground-dwelling sciurid, where males and females cooperatively defend territories. Contrary to findings reported for other social sciurids, our results show that territorial resident males do not gain significant reproductive advantages. Resident males sired the majority of offspring from their respective territories only 10.5% of the time. A single non-resident male sired equal or greater number of offspring than any single resident male 71.2% of the time. While adult males were more likely to sire a greater number …

Behavior Of A Solitary Sociable Female Bottlenose Dolphin (Tursiops Truncatus) Off The Coast Of Kent, Southeast England, Sonja Eisfeld, Mark P. Simmonds, Laura R. Stansfield

Ethology Collection

This article provides a report of the behavior of a solitary sociable dolphin studied on the southeast coast of England in 2007. This is the first study of its kind in which behavior of such a nonhuman animal was systematically studied. By the time of this study, this young female was highly interactive with people in the water. People accompanied the dolphin for 18.4% of the 100 hr of observation, and their presence changed her behavior. The study recorded 39 different behaviors; feeding and resting behaviors declined in frequency in the presence of people. In addition, the dolphin exhibited behavior …

Quality Prevails Over Identity In The Sexually Selected Vocalisations Of An Ageing Mammal, Elodie F. Briefer, Elisabetta Vannoni, Alan G. Mcelligott

Ethology Collection

Background: Male sexually selected vocalisations generally contain both individuality and quality cues that are crucial in intra- as well as inter-sexual communication. As individuality is a fixed feature whereas male phenotypic quality changes with age, individuality and quality cues may be subjected to different selection pressures over time. Individuality (for example, morphology of the vocal apparatus) and quality (for example, body size and dominance status) can both affect the vocal production mechanism, inducing the same components of vocalisations to convey both kinds of information. In this case, do quality-related changes to the acoustic structure of calls induce a modification of …

Discourse And Wolves: Science, Society, And Ethics, William S. Lynn

Human and Animal Bonding Collection

Wolves have a special resonance in many human cultures. To appreciate fully the wide variety of views on wolves, we must attend to the scientific, social, and ethical discourses that frame our understanding of wolves themselves, as well as their relationships with people and the natural world. These discourses are a configuration of ideas, language, actions, and institutions that enable or constrain our individual and collective agency with respect to wolves.

Scientific discourse is frequently privileged when it comes to wolves, on the assumption that the primary knowledge requirements are matters of ecology, cognitive ethology, and allied disciplines. Social discourse …

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 …

Pain Perception In Fish: Indicators And Endpoints, Lynne U. Sneddon

Aquaculture Collection

Recent evidence has shown that fish display aversive behavioral and physiological reactions and a suspension of normal behavior in response to noxious stimuli that cause pain in other animals and humans. In addition to these behavioral responses, scientists have identified a peripheral nociceptive system and recorded specific changes in the brain activity of fish during noxious stimulation. As a result of these observations teleost fish are now considered capable of nociception and, in some opinions, pain perception. From both an experimental and an ethical perspective, it is important that scientists be able to assess possible pain and minimize discomfort that …

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%) …

Response To Displaced Neighbours In A Territorial Songbird With A Large Repertoire, Elodie F. Briefer, Thierry Aubin, Fanny Rybak

Ethology Collection

Neighbour recognition allows territory owners to modulate their territorial response according to the threat posed by each neighbour and thus to reduce the costs associated with territorial defence. Individual acoustic recognition of neighbours has been shown in numerous bird species, but few of them had a large repertoire. Here, we tested individual vocal recognition in a songbird with a large repertoire, the skylark Alauda arvensis. We first examined the physical basis for recognition in the song, and we then experimentally tested recognition by playing back songs of adjacent neighbours and strangers. Males showed a lower territorial response to adjacent neighbours …

Effects Of Selection For Cooperation And Attention In Dogs, Márta Gácsi, Paul Mcgreevy, Edina Kara, Ádám Miklósi

Cooperative Behavior Collection

Background: It has been suggested that the functional similarities in the socio-cognitive behaviour of dogs and humans emerged as a consequence of comparable environmental selection pressures. Here we use a novel approach to account for the facilitating effect of domestication in dogs and reveal that selection for two factors under genetic influence (visual cooperation and focused attention) may have led independently to increased comprehension of human communicational cues.

Method: In Study 1, we observed the performance of three groups of dogs in utilizing the human pointing gesture in a two-way object choice test. We compared breeds selected to work while …

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

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, …

Animal Behaviour, Animal Welfare And The Scientific Study Of Affect, David Fraser

Emotion Collection

Many questions about animal welfare involve the affective states of animals (pain, fear, distress) and people look to science to clarify these issues as a basis for practices, policies and standards. However, the science of the mid twentieth century tended to be silent on matters of animal affect for both philosophical and methodological reasons. Philosophically, under the influence of Positivism many scientists considered that the affective states of animals fall outside the scope of science. Certain methodological features of the research also favoured explanations that did not involve affect. The features included the tendency to rely on abstract, quantitative measures …

Wild Justice - Honor And Fairness Among Beasts At Play, Marc Bekoff, Jessica Pierce

Social Cognition Collection

This essay challenges science’s traditional taboo against anthropomorphizing animals or considering their behavior as indicative of feelings similar to human emotions. In their new book Wild Justice: The Moral Lives of Animals, the authors argue that anthropomorphism is alive and well, as it should be. Here they describe some activities of animals, particularly animals at play, as clear signs that they have recognizable emotions and moral intelligence. Based on years of behavioral and cognitive research, the authors discuss in their book that animals exhibit a broad repertoire of moral behaviors, including empathy and cooperation, but here they concentrate on the …

Adult-Young Ratio, A Major Factor Regulating Social Behaviour Of Young: A Horse Study, Alice De Boyer Des Roches, Martine Hausberger

Social Behavior Collection

Background: Adults play an important role in regulating the social behaviour of young individuals. However, a few pioneer studies suggest that, more than the mere presence of adults, their proportions in social groups affect the social development of young. Here, we hypothesized that aggression rates and social cohesion were correlated to adult-young ratios. Our biological model was naturally-formed groups of Przewalski horses, Equus f. przewalskii, varying in composition.

Methodology/Principal Findings: We investigated the social interactions and spatial relationships of 12 one- and two-yearold Przewalski horses belonging to five families with adult-young ratios (AYR) ranging from 0.67 to 1.33. We found …

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 …

Can We Measure Distress In Animals?, David Fraser

Ethology Collection

When scientists try to identify and mitigate distress in animals, an obvious first question is: can we actually measure distress? Today, after three decades of scientific research on animal welfare it must seem obvious that this is possible, but let me offer a more guarded response.

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 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.

Concepts Of Distress, Suffering And Their Operational Interpretation, Marian Stamp Dawkins

Ethology Collection

The major concern of this paper is with the operational interpretation of animal distress and suffering – that is, with the issue of how we can measure the extent of an animal’s distress in practice. I shall probably make myself very unpopular by expressing the view right from the outset that I think it is neither possible nor desirable to try to discover universal ‘indicators’ of distress that will apply to all animals in all situations.

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.

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

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 …