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Articles 181 - 210 of 451
Full-Text Articles in Terrestrial and Aquatic Ecology
Lessons From Chimpanzee Sign Language Studies, Mary Lee Jensvold
Lessons From Chimpanzee Sign Language Studies, Mary Lee Jensvold
Animal Sentience
Claims are often made about behaviors being unique to humans; the evidence usually shows they are not. Sign language studies on chimpanzees may provide a useful model for comparative studies of suicide. A productive approach to comparative studies is to focus on observable behaviors rather than getting lost in the pitfalls of vague definitions and changing measures.
Can Nondolphins Commit Suicide?, David M. Peña-Guzmán
Can Nondolphins Commit Suicide?, David M. Peña-Guzmán
Animal Sentience
This Response addresses the scientific and philosophical criticisms of my 2017 target article “Can nonhuman animals commit suicide?” It defends my key claims and explores topics (such as animal judgment, animal theory of mind, and the evolution of suicide) that did not appear in the original article. It also points out areas in which further research is needed and concludes that we should be wary of accusations of “anthropomorphism” in debates about animal suicide.
Dna Extraction And Microsatellite Amplification Of Daphnia Pulicaria Resting Eggs: Analysis Of Allele Frequencies Through Time, Anna Ries
Departmental Honors Projects
A paleoecological approach allows for the study of genetic change in populations over longer periods of time than would be possible if one were sampling populations from year to year. Daphnia and other cladoceran zooplankton are amenable to this type of study because they produce diapausing embryos (ephippial eggs) when they sexually reproduce, and these resting eggs can remain viable for decades to centuries in lake sediments. This study uses paleoecological methods as well as a new methodology for ephippial DNA extraction and amplification to assay for genetic variation in ephippial eggs obtained from sediments of varying ages from Square …
Animal Suicide: Evolutionary Continuity Or Anthropomorphism?, Antonio Preti
Animal Suicide: Evolutionary Continuity Or Anthropomorphism?, Antonio Preti
Animal Sentience
Evolutionary processes are characterized by both continuity and discontinuity. Evidence on suicide in nonhuman animals is faint and often rests on the metaphorical or anthropomorphic use of the term. Suicidal behavior might be an evolutionary jump relatively recent in our species: a byproduct of living in groups of people who are not as closely related genetically as in social groups of nonhuman mammals.
Roots Of Self-Preservation Failure In Animal Behavior, Denys Decatanzaro
Roots Of Self-Preservation Failure In Animal Behavior, Denys Decatanzaro
Animal Sentience
Affective variation from euphoria to dysphoria, best understood in humans, is also found in the behavior and neurochemistry of many other mammals. Suicide in humans typically occurs in highly dysphoric and despondent individuals. Self-injurious behavior has been observed in dysphoric and despondent nonhuman primates. In humans, suicide is facilitated by a highly-evolved neocortex giving rise to behavioral flexibility and culture. As Peña-Guzmán indicates, some other mammals also have elaborate neocortices and the capacity for cognitive insight, particularly apes, delphinids, and whales. Suicide is most likely to occur in species where individuals live in stable groups of highly interdependent kin.
Animal Suicide And "Anthropodenial", Ryan Hediger
Animal Suicide And "Anthropodenial", Ryan Hediger
Animal Sentience
Increasing understanding of the impressive cognitive and social capacities of nonhuman animals suggests the possibility that they may sometimes commit suicide. Such notions tend to be dismissed as “anthropomorphism.” That interpretive hazard, I argue, must be weighed against the opposite hazard of “anthropodenial” — “the a priori rejection of shared characteristics between humans and animals” (de Waal 2006). If animals do commit suicide, how often is it motivated precisely by the impact of humans on animal life?
Continuum And Temporality, Gerard Kuperus
Continuum And Temporality, Gerard Kuperus
Animal Sentience
I fully support the continuum proposed in the target article and argue along the same lines that we should be suspicious of drawing any strict borders between human and non-human animals. Since we can say very little with absolute certainty about human intentions regarding suicide, we have no certainty about the intentions of non-human animals. Although I am very sympathetic to Peña-Guzmán’s overall argument, I suggest that time could be taken into consideration as well.
Thinking About Thinking Chickens, Lori Marino
Thinking About Thinking Chickens, Lori Marino
Animal Sentience
This response focuses on three major conceptual threads that run through the peer commentary on my target article: (1) how the use of chickens influences our views of them, (2) whether education is effective, and (3) what components of chicken psychology are most relevant to understanding who chickens are.
Dogs Aren’T Jealous – They Are Just Asking For Accurate Information, Karen L. Overall
Dogs Aren’T Jealous – They Are Just Asking For Accurate Information, Karen L. Overall
Animal Sentience
Awake fMRI offers us a unique opportunity to view and understand how dogs see the world and use the information in it. Given the limitations of behavioral assays and the small sample sizes inherent in these studies, labeling of patterns of canine behaviors using pop psychology terms may actually interfere with our understanding of canine brains and obscure for us a more parsimonious but exciting interpretation of canine behavior. We should use this window into how dogs think wisely.
Chicken Minds And Moral Standing, Kristin Andrews
Chicken Minds And Moral Standing, Kristin Andrews
Animal Sentience
Some of the cognitive traits that Marino reviews are not in themselves relevant to ethics, either for chickens or human infants, but affective traits are, among them desires.
Lessons From Behaviour For Brain Imaging, Carolyn J. Walsh
Lessons From Behaviour For Brain Imaging, Carolyn J. Walsh
Animal Sentience
Integrating physiological and behavioural arousal with social context is fundamental to understanding affect in dogs. Cook et al. (2018) have made a worthy start towards illuminating the neural basis of dog affect underlying resource loss. However, their study depends on retrospective behaviour reports versus direct testing, and an interpretation of differential neural activation that is based on too few dogs. Research groups conducting canine brain-imaging work might: (1) consider collaborative approaches to augment sample sizes and replicability, and (2) take a recent lesson from dog behavioural research regarding a more cautious approach to applying functional labels to physiological and/or behavioural …
The Degeneracy Of Behavior And The Rise Of Neuroimaging To Measure Affective States In Dogs, Peter F. Cook, Gregory S. Berns
The Degeneracy Of Behavior And The Rise Of Neuroimaging To Measure Affective States In Dogs, Peter F. Cook, Gregory S. Berns
Animal Sentience
It is gratifying and significant that so many scientists from diverse fields are arguing in-depth regarding a particularly complex set of social emotions in a non-human animal. Emotions play a fundamental role in decision making and information processing. Neuroimaging is important in understanding the cognitive and emotional worlds of non-human animals and can help measure covert emotions lacking clear behavioral correlates. Various experimental approaches could clarify the relative importance of attachment and aggression in jealousy and whether the phenomenon we measured is more akin to human envy or jealousy. Reverse inference from amygdala activation is probably justified because behavior is …
Finding The Green-Eyed Monster In The Brain Of A Dog, Peter Singer
Finding The Green-Eyed Monster In The Brain Of A Dog, Peter Singer
Animal Sentience
That dogs show behavior suggestive of jealousy has long been known and has been demonstrated under controlled conditions. Cook et al. have now shown arousal in the amygdala when dogs see a caregiver feeding another dog. This finding has ethical significance in two respects. First, the consideration shown by the investigators for the welfare of their experimental subjects sets an example for other researchers using animals. Second, the greater understanding of the emotional lives of animals should lead to more concern for their needs.
What Can The Social Emotions Of Dogs Teach Us About Human Emotions?, Dean Mobbs
What Can The Social Emotions Of Dogs Teach Us About Human Emotions?, Dean Mobbs
Animal Sentience
It has long been believed that social emotions such as guilt and jealousy are only expressed in humans. In the case of jealousy, its adaptive value has been linked to the prevention of sexual infidelity or fairness. So why would dogs feel jealousy? I suggest that understanding how social emotions have been bred into dogs can help us understand our own emotions, including their functionality — and potentially their mechanisms.
What Would We Like To Know By Imaging The Brains Of Dogs?, Ralph Adolphs
What Would We Like To Know By Imaging The Brains Of Dogs?, Ralph Adolphs
Animal Sentience
Using fMRI to study emotions in animals is important, fascinating, and fraught with methodological and conceptual problems. Cook et al. are doing it, and there is no question that they and others will be doing it better and better as time goes on. Where will this lead us? What could fMRI in principle tell us about the minds of nonhuman animals?
Sentience, The Final Frontier...., Shelley Adamo
Sentience, The Final Frontier...., Shelley Adamo
Animal Sentience
Arguments for fish sentience have difficulty with the philosophical zombie problem. Progress in AI has shown that complex learning, pain behavior, and pain as a motivational drive can be emulated by robots without any internal subjective experience. Therefore, demonstrating these abilities in fish does not necessarily demonstrate that fish are sentient. Further evidence for fish sentience may come from optogenetic studies of neural networks in zebrafish. Such studies may show that zebrafish have neural network patterns similar to those that correlate with sentience in humans. Given the present uncertainty regarding sentience in fish, caution should be applied regarding the precautionary …
Sentience: All Or None Or Matter Of Degree?, Loren Martin, Robert Gerlai
Sentience: All Or None Or Matter Of Degree?, Loren Martin, Robert Gerlai
Animal Sentience
The question of whether fish feel pain is muddied by anthropomorphic thinking. Comparing biological phenomena in two species should be informed by the criteria for good animal models: face validity, construct validity and predictive validity. Viewed through this lens, we argue that fish do feel pain and may possess some level of sentience. Evolutionary relatedness, hence similarities and differences between species (fish and humans in this case), are not about black vs. white but about shades of grey.
Fish Sentience, Consciousness, And Ai, Ila France Porcher
Fish Sentience, Consciousness, And Ai, Ila France Porcher
Animal Sentience
The systematic criticism of articles providing evidence that fish and invertebrates can feel pain is discussed. Beliefs are known to be stronger than evidence in the human mind, and could generate this outcry, while from another perspective, the criticisms appear as a territorial move by fishermen against a perceived threat to their domain. The scientific inconsistency in which consciousness is granted to machines but not to fish and invertebrates, purely due to political bias, is pointed out. No basis exists for denying sentience to any life form as long as science is ignorant of the nature and source of consciousness.
The Human Nervous System Is Not The Gold Standard For Pain, Riccardo Manzotti
The Human Nervous System Is Not The Gold Standard For Pain, Riccardo Manzotti
Animal Sentience
The basis of pain could be the causal nexus between one’s phylogenetic/ontogenetic history and one’s behavior. It might turn out that the neural implementation is immaterial to the instantiation of pain. Widely different neural structures may token the same pain-type, and nearly identical neural structures may token different types.
Time To (Finally) Acknowledge That Fish Have Emotionality And Pain, Konstantin A. Demin, Anton M. Lakstygal, Allan V. Kalueff
Time To (Finally) Acknowledge That Fish Have Emotionality And Pain, Konstantin A. Demin, Anton M. Lakstygal, Allan V. Kalueff
Animal Sentience
The increasing work using fish as a model organism calls for a better understanding of their sentience. While growing evidence suggests that pain and emotionality exist in zebrafish, many deniers continue to ignore the evidence. Here we revisit the main conceptual breakthroughs in the field that argue clearly for pain and emotionality. We call for an end to denial and a focus on studying the mechanisms of fish pain and emotionality, and their translational relevance to human conditions.
Human And Nonhuman Animals: Equals In Uniqueness, Uta Maria Juergens
Human And Nonhuman Animals: Equals In Uniqueness, Uta Maria Juergens
Animal Sentience
Chapman & Huffman attack the idea that humans are unique and therefore superior to nonhuman beings. They call on humankind to use their “intellect to change [their] actions.” I am in full accord with their line of thought, which differentiates uniqueness from superiority and enjoins humans to take responsible action. I suggest, however, that humans are unique with regard to cognitive fluidity. The same conclusions can be reached via another argument based on human uniqueness.
Can They Suffer?, Todd K. Shackelford
Can They Suffer?, Todd K. Shackelford
Animal Sentience
We should treat sentient nonhuman animals as worthy of moral consideration, not because we share an evolutionary history with them, but because they can suffer. As Chapman & Huffman (2018) argue, humans are not uniquely disconnected from other species. We should minimize the suffering we inflict on sentient beings — whether human or nonhuman — not because they, too, are tool-makers or have sophisticated communication systems, but because they, too, can suffer, and suffering is bad.
Is Superiority A Necessary Aspect Of Cruelty?, William H. Edmondson
Is Superiority A Necessary Aspect Of Cruelty?, William H. Edmondson
Animal Sentience
Chapman & Huffman argue that humans inflict cruelty without apparent concern because of their categorization of the victims as inferior. The supposed inferiority of non-human animals can be argued against on the basis of documentation and analysis of behaviour. Humans continue to inflict cruelty on their own and other species. It is not obvious that a sense of superiority is a necessary aspect of cruel behaviour. Nor is it obvious that further enlightenment regarding the cognitive status of non-humans will diminish cruelty.
Researchers, Not Dogs, Lack Control In An Experiment On Jealousy, Jennifer Vonk
Researchers, Not Dogs, Lack Control In An Experiment On Jealousy, Jennifer Vonk
Animal Sentience
Cook and colleagues (2018) have developed a clever method to measure fMRI in awake dogs in response to a number of interesting stimuli. As a result, they are able to determine neural correlates of observable behavior. They report that dogs may experience something akin to jealousy because they show greater amygdala activation in response to food being given to a fake dog versus food being placed in a bucket. However, several critical controls are missing which prevent the authors from being able to speak of jealousy.
Fill-In-The-Blank-Emotion In Dogs? Evidence From Brain Imaging, Alexandra Horowitz, Becca Franks, Jeff Sebo
Fill-In-The-Blank-Emotion In Dogs? Evidence From Brain Imaging, Alexandra Horowitz, Becca Franks, Jeff Sebo
Animal Sentience
What is needed to make meaningful claims about an animal’s capacity for subjective experience? Cook et al. (2018) attempt to study jealousy in dogs by placing them in a particular context and then seeing whether they display a particular brain state. We argue that this approach to studying jealousy falls short for two related reasons. First, the relationship between jealousy and the selected context is unclear. Second, the relationship between jealousy and the selected brain state (indeed, any single brain state) is unclear. These and other issues seriously limit what this study can show. It is important not to see …
Fish Sentience Denial: Muddy Moral Water, Robert C. Jones
Fish Sentience Denial: Muddy Moral Water, Robert C. Jones
Animal Sentience
Sneddon et al. (2018) authoritatively summarize the compelling and overwhelming evidence for fish sentience, while methodically dismantling one rather emblematic research paper (Diggles et al. 2017) intended to discount solid evidence of fish sentience (Lopez-Luna et al. 2017a, 2017b, 2017c, & 2017d). I explore the larger practical moral contexts within which these debates take place and argue that denials of animal sentience are really moral canards.
Defining Pain And Painful Sentience In Animals, Edgar T. Walters
Defining Pain And Painful Sentience In Animals, Edgar T. Walters
Animal Sentience
Sentience is essential to most definitions of pain, including a detailed definition invoked by Sneddon et al. to argue that adult and perhaps larval fish feel pain. Because proving painful sentience in non-human animals is not feasible, multiple lines of indirect evidence are needed to implicate pain. This commentary examines the list of 17 criteria used by Sneddon et al. to conclude that fish have conscious pain. The criteria include tests of nociceptive, motivational, and cognitive properties useful for revealing pain-like states that can be understood biologically and be related evolutionarily to human pain. However, additional research is needed to …
Two Fallacies In Comparisons Between Humans And Non-Humans, Don Ross
Two Fallacies In Comparisons Between Humans And Non-Humans, Don Ross
Animal Sentience
The hypothesis that humans are superior to non-humans by virtue of higher cognitive powers is often supported by two recurrent fallacies: (1) that any competence shown by humans but not by our closest living relatives (apes) must be unique to humans; and (2) that grades of intelligence can be inferred from behavior without regard to motivational structures.
Fish Consciousness, David Gamez
Fish Consciousness, David Gamez
Animal Sentience
Woodruff makes two arguments to support his claim that ray-finned fish are conscious: (1) Fish neuroanatomy has similarities with the structures in the human brain that support consciousness. (2) The complexity and flexibility of fish behaviour suggest that they are conscious. This commentary will argue that neither the neuroanatomical nor the behavioural argument can provide conclusive evidence for consciousness in fish. We should suspend judgement until we have discovered mathematical theories of consciousness that can reliably map between states of consciousness and states of the physical world.
What Sets Us Apart Could Be Our Salvation, Anne Fawcett, Paul Mcgreevy
What Sets Us Apart Could Be Our Salvation, Anne Fawcett, Paul Mcgreevy
Animal Sentience
We agree with Chapman & Huffman that human capacities are often assumed to be unique — or attempts are made to demonstrate uniqueness scientifically — in order to justify the exploitation of animals and ecosystems. To extend the argument that human exceptionalism is against our interests, we recommend adopting the One Welfare framework, according to which animal welfare, environmental sustainability and human wellbeing are inseparably linked. Let us distinguish ourselves from other animals by resisting our short- and mid-term Darwinian inclinations, consuming less, reproducing less, and striving for a much longer-term biological fitness for us all.