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Articles 121 - 150 of 407
Full-Text Articles in Comparative Psychology
Scent Of The Familiar: An Fmri Study Of Canine Brain Responses To Familiar And Unfamiliar Human And Dog Odors, Gregory S. Berns, Andrew M. Brooks, Mark Spivak
Scent Of The Familiar: An Fmri Study Of Canine Brain Responses To Familiar And Unfamiliar Human And Dog Odors, Gregory S. Berns, Andrew M. Brooks, Mark Spivak
Social Cognition Collection
Understanding dogs’ perceptual experience of both conspecifics and humans is important to understand how dogs evolved and the nature of their relationships with humans and other dogs. Olfaction is believed to be dogs’ most powerful and perhaps important sense and an obvious place to begin for the study of social cognition of conspecifics and humans. We used fMRI in a cohort of dogs (N = 12) that had been trained to remain motionless while unsedated and unrestrained in the MRI. By presenting scents from humans and conspecifics, we aimed to identify the dimensions of dogs’ responses to salient biological …
Defining And Assessing Animal Pain, Lynne U. Sneddon, Robert W. Elwood, Shelley A. Adamo, Matthew C. Leach
Defining And Assessing Animal Pain, Lynne U. Sneddon, Robert W. Elwood, Shelley A. Adamo, Matthew C. Leach
Experimentation Collection
The detection and assessment of pain in animals is crucial to improving their welfare in a variety of contexts in which humans are ethically or legally bound to do so. Thus clear standards to judge whether pain is likely to occur in any animal species is vital to inform whether to alleviate pain or to drive the refinement of procedures to reduce invasiveness, thereby minimizing pain. We define two key concepts that can be used to evaluate the potential for pain in both invertebrate and vertebrate taxa. First, responses to noxious, potentially painful events should affect neurobiology, physiology and behaviour …
Fish Cognition, Redouan Bshary, Culum Brown
Fish Cognition, Redouan Bshary, Culum Brown
Social Cognition Collection
No abstract provided.
Canine Sense And Sensibility: Tipping Points And Response Latency Variability As An Optimism Index In A Canine Judgement Bias Assessment, Melissa J. Starling, Nicholas Branson, Denis Cody, Timothy R. Starling, Paul D. Mcgreevy
Canine Sense And Sensibility: Tipping Points And Response Latency Variability As An Optimism Index In A Canine Judgement Bias Assessment, Melissa J. Starling, Nicholas Branson, Denis Cody, Timothy R. Starling, Paul D. Mcgreevy
Cognitive Ethology Collection
Recent advances in animal welfare science used judgement bias, a type of cognitive bias, as a means to objectively measure an animal's affective state. It is postulated that animals showing heightened expectation of positive outcomes may be categorised optimistic, while those showing heightened expectations of negative outcomes may be considered pessimistic. This study pioneers the use of a portable, automated apparatus to train and test the judgement bias of dogs. Dogs were trained in a discrimination task in which they learned to touch a target after a tone associated with a lactose-free milk reward and abstain from touching the target …
Anthropomorphism, Anthropectomy, And The Null Hypothesis, Kristin Andrews, Brian Huss
Anthropomorphism, Anthropectomy, And The Null Hypothesis, Kristin Andrews, Brian Huss
Experimentation Collection
We examine the claim that the methodology of psychology leads to a bias in animal cognition research against attributing ‘‘anthropomorphic’’ properties to animals (Sober in Thinking with animals: new perspectives on anthropomorphism. Columbia University Press, New York, pp 85–99, 2005; de Waal in Philos Top 27:225–280, 1999). This charge is examined in light of a debate on the role of folk psychology between primatologists who emphasize similarities between humans and other apes, and those who emphasize differences. Weargue that while in practice there is sometimes bias, either in the formulation of the null hypothesis or in the preference of Type-II …
Laterality Influences Cognitive Performance In Rainbowfish Melanotaenia Duboulayi, Anne-Laurence Bibost, Culum Brown
Laterality Influences Cognitive Performance In Rainbowfish Melanotaenia Duboulayi, Anne-Laurence Bibost, Culum Brown
Sentience Collection
Cerebral lateralization has been suggested to convey a selective advantage to individuals by enhancing their cognitive abilities. Few, however, have explicitly compared the cognitive ability of animals with strongly contrasting laterality. Here, we examined the influence of laterality on learning performance in the crimson spotted rainbowfish, Melanotaenia duboulayi, using a classical conditioning paradigm. We also compared the learning ability of wild caught and captive-reared fish to examine the influence of rearing environment on cognitive performance. Laterality was established by observing which eye fish preferred to use while viewing their mirror image. Subjects were then conditioned to associate the appearance of …
A Comparison Of Spatial Learning And Memory Capabilities In Intertidal Gobies, Gemma E. White, Culum Brown
A Comparison Of Spatial Learning And Memory Capabilities In Intertidal Gobies, Gemma E. White, Culum Brown
Sentience Collection
For the majority of animals, the ability to orient in familiar locations is a fundamental part of life, and spatial memory allows individuals to remember key locations such as food patches, shelter, mating sites or areas regularly occupied by predators. This study determined if gobies collected from rocky platforms and sandy beaches differ in their ability to learn and memorise the locations of tide pools in a simulated rocky intertidal zone. Intertidal rock pool gobies show acute homing abilities and, therefore, should be expected to display superior learning and memory capabilities. In contrast, it is unlikely that natural selection would …
Socialising Piglets In Lactation Positively Affects Their Post-Weaning Behaviour, Talia Morgan, John Pluske, David Miller, Teresa Collins, Anne L. Barnes, Françoise Wemelsfelder, Patricia A. Fleming
Socialising Piglets In Lactation Positively Affects Their Post-Weaning Behaviour, Talia Morgan, John Pluske, David Miller, Teresa Collins, Anne L. Barnes, Françoise Wemelsfelder, Patricia A. Fleming
Sentience Collection
Although commercial farrowing sheds keep individual litters separated, previous studies have suggested that housing systems that allow socialisation of piglets pre-weaning can reduce aggression after weaning. This study tested whether pigs socialised with non-littermates pre-weaning would show less aggression during mixing at weaning (when piglets are taken from their sows and mixed in group housing), and whether socialisation influenced the time budgets or behavioural expression of piglets at weaning. In total, 353 piglets were followed from birth through to one week after weaning. Piglets from 24 sows were allowed to socialise in groups of four litters (‘socialised’ treatment group) from …
Behaviour Of Horses In A Judgment Bias Test Associated With Positive Or Negative Reinforcement, Sabrina Briefer Freymond, Elodie F. Briefer, Anja Zollinger, Yveline Gindrat-Von Allmen, Christa Wyss, Iris Bachmann
Behaviour Of Horses In A Judgment Bias Test Associated With Positive Or Negative Reinforcement, Sabrina Briefer Freymond, Elodie F. Briefer, Anja Zollinger, Yveline Gindrat-Von Allmen, Christa Wyss, Iris Bachmann
Ethology Collection
Moods can influence our judgment of ambiguous stimuli as positive or negative. Measuring judgment bias in animals is a promising method to objectively assess their emotional states. Our study aimed to develop a cognitive bias test in horses, in order to assess the effect of training using positive reinforcement (PR) or negative reinforcement (NR) on their emotional states. We trained 12 mares to discriminate between a rewarded and a non-rewarded location situated on each side of a paddock. The mares were then trained during five days to perform several exercises using PR (n = 6) for one group, and NR …
Emotional Engagements Predict And Enhance Social Cognition In Young Chimpanzees, Kim A. Bard, Roger Bakeman, Sarah T. Boysen, David A. Leavens
Emotional Engagements Predict And Enhance Social Cognition In Young Chimpanzees, Kim A. Bard, Roger Bakeman, Sarah T. Boysen, David A. Leavens
Sentience Collection
Social cognition in infancy is evident in coordinated triadic engagements, that is, infants attending jointly with social partners and objects. Current evolutionary theories of primate social cognition tend to highlight species differences in cognition based on human-unique cooperative motives. We consider a developmental model in which engagement experiences produce differential outcomes. We conducted a 10-year-long study in which two groups of laboratory-raised chimpanzee infants were given quantifiably different engagement experiences. Joint attention, cooperativeness, affect, and different levels of cognition were measured in 5- to 12-month-old chimpanzees, and compared to outcomes derived from a normative human database. We found that joint …
Artificial Neural Network Approach For Revealing Individuality, Group Membership And Age Information In Goat Kid Contact Calls, Livio Favaro, Elodie F. Briefer, Alan G. Mcelligott
Artificial Neural Network Approach For Revealing Individuality, Group Membership And Age Information In Goat Kid Contact Calls, Livio Favaro, Elodie F. Briefer, Alan G. Mcelligott
Sentience Collection
Machine learning techniques are becoming an important tool for studying animal vocal communication. The goat (Capra hircus) is a very social species, in which vocal communication and recognition are important. We tested the reliability of a Multi-Layer Perceptron (feed-forward Artificial Neural Network, ANN) to automate the process of classification of calls according to individual identity, group membership and maturation in this species. Vocalisations were obtained from 10 half-sibling (same father but different mothers) goat kids, belonging to 3 distinct social groups. We recorded 157 contact calls emitted during first week, and 164 additional calls recorded from the same individuals at …
Male Brush-Turkeys Attempt Sexual Coercion In Unusual Circumstances, David A. Wells, Darryl N. Jones, David Bulger, Culum Brown
Male Brush-Turkeys Attempt Sexual Coercion In Unusual Circumstances, David A. Wells, Darryl N. Jones, David Bulger, Culum Brown
Reproductive Behavior Collection
Sexual coercion by males is generally understood to have three forms: forced copulation, harassment and intimidation. We studied Australian brush-turkeys, Alectura lathami, to determine whether some male behaviours towards females at incubation mounds could be classified as aggressive, whether males were attempting sexual coercion and, if so, whether the coercion was successful. We found that some male behaviours towards females were significantly more likely to be followed by the cessation of female mound activity, and hence could be classified as aggressive, while others were significantly more likely to be followed by the commencement of female mound activity, and hence could …
Laterality Is Linked To Personality In The Black-Lined Rainbowfish, Melanotaenia Nigrans, Culum Brown, Anne-Laurence Bibost
Laterality Is Linked To Personality In The Black-Lined Rainbowfish, Melanotaenia Nigrans, Culum Brown, Anne-Laurence Bibost
Sentience Collection
Emotions such as fear in vertebrates are often strongly lateralised, that is, a single cerebral hemisphere tends to be dominant when processing emotive stimuli. Boldness is a measure of an individual’s propensity to take risks and it has obvious connections with fear responses. Given the emotive nature of this well-studied personality trait, there is good reason to suspect that it is also likely to be expressed in a single hemisphere. Here, we examined the link between laterality and boldness in wild and captive-reared rainbowfish, Melanotaenia nigrans. We found that fish from the wild were bolder than those from captivity, which …
Juvenile Domestic Pigs (Sus Scrofa Domestica) Use Human-Given Cues In An Object Choice Task, Christian Nawroth, Mirjam Ebersbach, Eberhard Von Borell
Juvenile Domestic Pigs (Sus Scrofa Domestica) Use Human-Given Cues In An Object Choice Task, Christian Nawroth, Mirjam Ebersbach, Eberhard Von Borell
Social Cognition Collection
Research on the comprehension of human-given cues by domesticated as well as non-domesticated species has received considerable attention over the last decade. While several species seem to be capable of utilizing these cues, former work with domestic pigs (Sus scrofa domestica) has shown inconclusive results. In this study, we investigated the use of human-given cues in an object choice task by young domestic pigs (N = 17; seven weeks of age) who had very limited human contact prior to the experiments. Subjects had to choose between two bowls of which only one was baited with a reward. Over the course …
Exclusion Performance In Dwarf Goats (Capra Aegagrus Hircus) And Sheep (Ovis Orientalis Aries), Christian Nawroth, Eberhard Von Borell, Jan Langbein
Exclusion Performance In Dwarf Goats (Capra Aegagrus Hircus) And Sheep (Ovis Orientalis Aries), Christian Nawroth, Eberhard Von Borell, Jan Langbein
Learning Ability Collection
Using a comparative approach, we investigated the ability of dwarf goats and sheep to use direct and indirect information about the location of a food reward in an object-choice task. Subjects had to choose between two cups with only one covering a reward. Before making a choice, subjects received information about the baited (direct information) or nonbaited cup (indirect information). Both goats and sheep were able to use direct information (presence of food) in the object choice task. After controlling for local enhancement, we found that goats rather than sheep were able to use indirect information (i.e., the absence of …
Goats Excel At Learning And Remembering A Highly Novel Cognitive Task, Elodie F. Briefer, Samaah Haque, Luigi Baciadonna, Alan G. Mcelligott
Goats Excel At Learning And Remembering A Highly Novel Cognitive Task, Elodie F. Briefer, Samaah Haque, Luigi Baciadonna, Alan G. Mcelligott
Sentience Collection
Introduction: The computational demands of sociality (maintaining group cohesion, reducing conflict) and ecological problems (extractive foraging, memorizing resource locations) are the main drivers proposed to explain the evolution cognition. Different predictions follow, about whether animals would preferentially learn new tasks socially or not, but the prevalent view today is that intelligent species should excel at social learning. However, the predictions were originally used to explain primate cognition, and studies of species with relatively smaller brains are rare. By contrast, domestication has often led to a decrease in brain size, which could affect cognition. In domestic animals, the relaxed selection pressures …
Fallow Bucks Attend To Vocal Cues Of Motivation And Fatigue, Benjamin J. Pitcher, Elodie F. Briefer, Elisabetta Vannoni, Alan G. Mcelligott
Fallow Bucks Attend To Vocal Cues Of Motivation And Fatigue, Benjamin J. Pitcher, Elodie F. Briefer, Elisabetta Vannoni, Alan G. Mcelligott
Sentience Collection
Vocalizations encode a range of information about the caller, and variation in calling behavior and vocal structure may provide listeners with information about the motivation and condition of the caller. Fallow bucks only vocalize during the breeding season and can produce more than 3000 groans per hour. Males modulate their calling rates, calling faster when other calling males and/or females are nearby. Groans also reveal caller fatigue, becoming shorter and higher pitched toward the end of the rut. Thus, fallow deer groans vary both over very short (minute to minute) and longer timescales (the rut). However, no studies have investigated …
Learning And Memory In The Port Jackson Shark, Heterodontus Portusjacksoni, Tristan L. Guttridge, Culum Brown
Learning And Memory In The Port Jackson Shark, Heterodontus Portusjacksoni, Tristan L. Guttridge, Culum Brown
Sentience Collection
Basic understanding of the fundamental principles and mechanisms involved in learning is lacking for elasmobranch fishes. Our aim in this study was to experimentally investigate the learning and memory capacity of juvenile Port Jackson sharks, Heterodontus portusjacksoni. Sharks (N = 30) were conditioned over a 19-day period to associate an underwater LED light or stream of air-bubbles [conditioned stimulus (CS)] with a food reward [unconditioned stimulus (US)], using three procedures (delay, trace and control). During experiments, the CS signalled at a random time between 180 and 300 s for 30 s (six times per day). For the delay the US …
Personality Affects Learning And Trade-Offs Between Private And Social Information In Guppies, Poecilia Reticulate, Larissa Trompf, Culum Brown
Personality Affects Learning And Trade-Offs Between Private And Social Information In Guppies, Poecilia Reticulate, Larissa Trompf, Culum Brown
Sentience Collection
The acquisition of information such as the location and quality of food, mates or shelter is a key survival requirement for animals. Individuals can acquire information through personal experience (private information) or through observing and interacting with others (social information). Environmental spatial and temporal heterogeneity can mean that sometimes social information conflicts with private knowledge. We tested how personality affected the importance placed on public versus private information in wild female guppies when these two information sources came into conflict. We found that boldness and sociality affected decisions to use conflicting social and private information. Bolder females used social information …
Empathy In Other Apes, Kristin Andrews, Lori Gruen
Empathy In Other Apes, Kristin Andrews, Lori Gruen
Sentience Collection
A number of scholars have offered behavioral and physiological arguments in favor of the existence of empathy in other species (see Bekoff & Pierce 2009, Flack & de Waal 2000, Plutchik 1987). While the evidence is compelling, claims about empathy in nonhuman apes face two different challenges. The first challenge comes from a set of empirical findings that suggest great apes are not able to think about other’s beliefs. The argument here is based on a view that empathy is associated with folk psychological understanding of others’ mental states, or mindreading, and the existence of mindreading among the other apes …
What Do Zebrafish Want? Impact Of Social Grouping, Dominance And Gender On Preference For Enrichment, Paul Schroeder, Soffia Jones, Iain S. Young, Lynne U. Sneddon
What Do Zebrafish Want? Impact Of Social Grouping, Dominance And Gender On Preference For Enrichment, Paul Schroeder, Soffia Jones, Iain S. Young, Lynne U. Sneddon
Sentience Collection
Although environmental enrichment is known to improve laboratory rodent wellbeing and enhance scientific data collection, relatively little is known with regards to the type of enrichment that might be useful for zebrafish (Danio rerio). Therefore, this study explored if zebrafish displayed preferences for a range of enrichments, including substrates, artificial plants, combinations thereof and airstones. Tanks divided into two compartments containing different enrichment cues were used to determine the preferences of zebrafish housed in pairs and groups of eight. When comparing time spent in enriched versus barren compartments, dominant individuals in a pair displayed a preference for substrate and behaviourally …
Individual Personality Traits Influence Group Exploration In A Feral Guppy Population, Culum Brown, Eleanor Irving
Individual Personality Traits Influence Group Exploration In A Feral Guppy Population, Culum Brown, Eleanor Irving
Sentience Collection
We examined whether variation in group exploratory behavior was linked with variation in personality traits (boldness, activity, and sociability) in a population of feral guppies (Poecilia reticulata). A huge amount of variation was observed in dispersal tendency between shoals. Surprisingly, no significant correlations were found between group exploratory behavior and average group personality scores, which suggests that the movement of the shoal was not generated by group conformity. However, our analysis revealed correlations between group exploration and the activity score of the least active member of a group and the sociality index of the most social member of a group. …
Hatching Success Of Rainbowfish Eggs Following Exposure To Air, Lois J. Oulton, Penelope Carbia, Culum Brown
Hatching Success Of Rainbowfish Eggs Following Exposure To Air, Lois J. Oulton, Penelope Carbia, Culum Brown
Aquaculture Collection
Translocation of fishes within and between drainage basins is widely recognised as a threatening process to Australian native fishes. While many translocations are deliberate, for example for fisheries enhancement, it is possible that translocation can occur naturally. In the Wet Tropic region of Australia, the widespread eastern rainbowfish, Melanotaenia splendida, has begun to colonise the Atherton tablelands. This is of particular concern because the area is home to several endangered endemic species such as the Lake Eacham rainbowfish, M. eachamensis, and its allies. It is likely that some of the translocations have occurred through the use of this species as …
Applying Ethological And Health Indicators To Practical Animal Welfare Assessment, F. Wemelsfelder, S. Mullan
Applying Ethological And Health Indicators To Practical Animal Welfare Assessment, F. Wemelsfelder, S. Mullan
Animal Welfare Collection
There is a growing effort worldwide to develop objective indicators for animal welfare assessment, which provide information on an animal’s quality of life, are scientifically trustworthy, and can readily be used in practice by professionals. Animals are sentient beings capable of positive and negative emotion, and so these indicators should be sensitive not only to their physical health, but also to their experience of the conditions in which they live. This paper provides an outline of ethological research aimed at developing practical welfare assessment protocols. The first section focuses on the development and validation of welfare indicators generally, in terms …
Qualitative Behavioural Assessment Of The Motivation For Feed In Sheep In Response To Altered Body Condition Score, C. A. Stockman, T. Collins, A. L. Barnes, D. Miller, S. L. Wickham, E. Verbeek, L. Matthews, D. Ferguson, F. Wemelsfelder, P. A. Fleming
Qualitative Behavioural Assessment Of The Motivation For Feed In Sheep In Response To Altered Body Condition Score, C. A. Stockman, T. Collins, A. L. Barnes, D. Miller, S. L. Wickham, E. Verbeek, L. Matthews, D. Ferguson, F. Wemelsfelder, P. A. Fleming
Sentience Collection
Qualitative behavioural assessment (QBA) has been used to quantify the expressive behaviour of animals, and operant tests have been used to quantify measures of behavioural need. In this study we compared measures of behavioural expression and behaviour in operant tests. We examined the behavioural expression of pregnant ewes of body condition score (BCS) 2 and 3. The ewes were exposed to a feed motivation test in which they received a food reward. Pregnant ewes (48–70 days gestation) were assessed during a food motivation test after they had been maintained at BCS 3 (n = 7) or given a decreasing plane …
Apes Communicate About Absent And Displaced Objects: Methodology Matters, Heidi Lyn, Jamie L. Russell, David A. Leavens, Kim A. Bard, Sarah T. Boysen, Jennifer A. Schaeffer, William D. Hopkins
Apes Communicate About Absent And Displaced Objects: Methodology Matters, Heidi Lyn, Jamie L. Russell, David A. Leavens, Kim A. Bard, Sarah T. Boysen, Jennifer A. Schaeffer, William D. Hopkins
Sentience Collection
Displaced reference is the ability to refer to an item that has been moved (displaced) in space and/ or time, and has been called one of the true hallmarks of referential communication. Several studies suggest that nonhuman primates have this capability, but a recent experiment concluded that in a specific situation (absent entities) human infants display displaced reference but chimpanzees do not. Here we show that chimpanzees and bonobos of diverse rearing histories are capable of displaced reference to absent and displaced objects. It is likely that some of the conflicting findings from animal cognition studies are due to relatively …
Selections On The Empirical And Theoretical Investigations Of Behavioral Variability: An Introduction To The Special Issue, W. David Stahlman, Aaron P. Blaisdell
Selections On The Empirical And Theoretical Investigations Of Behavioral Variability: An Introduction To The Special Issue, W. David Stahlman, Aaron P. Blaisdell
Psychological Science Articles
The study of behavioral variability continues to grow in importance and gather interest. A thorough understanding of the fundamental processes by which variation is generated and by which it is adaptive is potentially important to our understandings of a whole host of phenomena, including all types of learning, from basic skills to language and thought (Bateson & Martin, 2013) as well as the antifragility of complex systems (Taleb, 2012). This issue represents a brief look into an important scientific enterprise, extraordinarily vast in scope and implications (Brembs, 2010). Even if we accept a fundamental unpredictability to animal behavior, this does …
Laterality Influences Schooling Position In Rainbowfish, Melanotaenia Spp, Anne-Laurence Bibost, Culum Brown
Laterality Influences Schooling Position In Rainbowfish, Melanotaenia Spp, Anne-Laurence Bibost, Culum Brown
Aquaculture Collection
Cerebral lateralization is a widespread trait among animals, is often manifested as side biases in behaviour (laterality) and has been suggested to provide fitness benefits. Here we examined the influence of laterality on the organisation of fish schools using rainbowfish (Melanotaenia spp) as model species. The pattern and strength of laterality for each individual was determined by examining eye preferences whilst examining their reflection in a mirror. Schools of four fish of known laterality were then created and the preferred position for each fish within the school was repeatedly observed in a flume. Fish which showed right eye preferences in …
Discrimination Of Familiar Human Faces In Dogs (Canis Familiaris), Ludwig Huber, Anaïs Racca, Billy Scaf, Zsófia Virányi, Friederike Range
Discrimination Of Familiar Human Faces In Dogs (Canis Familiaris), Ludwig Huber, Anaïs Racca, Billy Scaf, Zsófia Virányi, Friederike Range
Recognition Collection
Faces are an important visual category for many taxa, and the human face is no exception to this. Because faces differ in subtle ways and possess many idiosyncratic features, they provide a rich source of perceptual cues. A fair amount of those cues are learned through social interactions and are used for future identification of individual humans. These effects of individual experience can be studied particularly well in hetero-specific face perception. Domestic dogs represent a perfect model in this respect, due to their proved ability to extract important information from the human face in socio-communicative interactions. There is also …
Predator Recognition In Rainbowfish, Melanotaenia Duboulayi, Embryos, Lois J. Oulton, Vivian Haviland, Culum Brown
Predator Recognition In Rainbowfish, Melanotaenia Duboulayi, Embryos, Lois J. Oulton, Vivian Haviland, Culum Brown
Aquaculture Collection
Exposure to olfactory cues during embryonic development can have long term impacts on birds and amphibians behaviour. Despite the vast literature on predator recognition and responses in fishes, few researchers have determined how fish embryos respond to predator cues. Here we exposed four-day-old rainbowfish (Melanotaenia duboulayi) embryos to cues emanating from a novel predator, a native predator and injured conspecifics. Their response was assessed by monitoring heart rate and hatch time. Results showed that embryos have an innate capacity to differentiate between cues as illustrated by faster heart rates relative to controls. The greatest increase in heart rate occurred in …