Risk-sensitive choice in humans as a function of an earnings budget

Risky choice in 3 adult humans was investigated across procedural manipulations designed to model energy-budget manipulations conducted with nonhumans. Subjects were presented with repeated choices between a fixed and a variable number of points. An energy budget was simulated by use of an earnings budget, defined as the number of points needed within a block of trials for points to be exchanged for money. During positive earnings-budget conditions, exclusive preference for the fixed option met the earnings requirement. During negative earnings-budget conditions, exclusive preference for the certain option did not meet the earnings requirement, but choice for the variable option met the requirement probabilistically. Choice was generally risk averse (the fixed option was preferred) when the earnings budget was positive and risk prone (the variable option was preferred) when the earnings budget was negative. Furthermore, choice was most risk prone during negative earnings-budget conditions in which the earnings requirement was most stringent. Local choice patterns were also frequently consistent with the predictions of a dynamic optimization model, indicating that choice was simultaneously sensitive to short-term choice contingencies, current point earnings, and the earnings requirement. Overall, these results show that the patterns of risky choice generated by energy-budget variables can also be produced by choice contingencies that do not involve immediate survival, and that risky choice in humans may be similar to that shown in nonhumans when choice is studied under analogous experimental conditions.     

Recursion, language, and starlings

It has been claimed that recursion is one of the properties that distinguishes human language from any other form of animal communication. Contrary to this claim, a recent study purports to demonstrate center-embedded recursion in starlings. I show that the performance of the birds in this study can be explained by a counting strategy, without any appreciation of center-embedding. To demonstrate that birds understand center-embedding of sequences of the form A(n) B(n) (such as A(1) A(2) B(2) B(1) , or A(3) A(4) A(5) B(5) B(4) B(3) ) would require not only that they discriminate such patterns from other patterns, but that they appreciate that elements must be bound from the outside in (thus, in the above examples, A(1) B(1) , A(2) B(2) , A(3) B(3) , A(4) B(4) , A(5) B(5) are bound pairs). This has not been shown in nonhuman species, and sentences with this structure are difficult even for humans to parse. There appears to be no evidence to date that nonhuman species understand recursion.     

Addendum to Killeen's (2019) Bidding for Delayed Rewards

Killeen (2019) portrayed an intimate relation between diverse economic indices, in particular compensation functions, discount functions, and demand functions. The article bemused some experts, however, by its counterintuitive prediction of an increase in the amount bid as the delay increased. Furthermore, the article failed to provide an explicit treatment of the small–soon versus large–late choice paradigm, to cite several papers that provided precedent for the current work, and to demonstrate the adequacy of his expenditure functions for data on purchasing decisions. These shortcomings are remedied in the current note, and some additional extensions offered.     

Repetitive Behavior in Neurodevelopmental Disorders: Clinical and Translational Findings

Repetitive behavior refers to a highly heterogeneous set of responses associated with a wide range of conditions, including normative development. Treatment studies for aberrant repetitive behavior are limited although one promising approach involves conceptualizing such behavior as a generalized inflexibility or lack of variability in responding. Relatively little is known about the neurobiological mechanisms that mediate the development and expression of repetitive behavior, information critical to the design of effective pharmacotherapies, early interventions, and prevention strategies. We will review clinical findings in repetitive behavior as well as findings from animal models highlighting environmental factors and the role of cortical-basal ganglia circuitry in mediating the development and expression of these behaviors. Findings from animal models have included identification of a specific neural pathway important in mediating repetitive behavior. Moreover, pharmacological studies that support the importance of this pathway have led to the identification of novel potential therapeutic targets. Expanding the evidence base for environmental enrichment-derived interventions and focusing on generalized variability in responding will aid in addressing the broader problem of rigidity or inflexibility.     

The Dark Triad and animal cruelty: Dark personalities,dark attitudes,and dark behaviors

Research examining the interpersonal interactions of those high on the Dark Triad has proliferated in recent years. Extant research, however, has not examined other types of relationships such as attitudes and behaviors towards animals. Further, there has been limited research examining the associations between personality and attitudes and behaviors towards animals generally. In this study, participants (N = 227) completed an online survey measuring the Dark Triad, attitudes towards animals, and acts of animal cruelty. The results revealed that individuals with higher levels of the Dark Triad demonstrated less positive attitudes towards animals and reported engaging in more acts of animal cruelty. Age and sex were found to be significant predictors of less positive attitudes and behaviors towards animals, independent of the Dark Triad. These results suggest that those callous and manipulative behaviors and attitudes that have come to be associated with the Dark Triad are not just limited to human-to-human interactions, but are also consistent across other interactions.     

Arthur Peacocke

Drawing on animal ethological studies, this article considers the possibility of a form of morality existing in animals and its relationship with human morality. Given this capacity, I argue that first we need to reflect more carefully on human sin and evil in evolutionary terms. Second, I question the adequacy of the traditional divide between “moral” and “natural” evil as well as consider the possibility of anthropogenic evil. Third, I suggest that a theological response to nonhuman morality should include discussion of the atonement, but traditional categories prove inadequate. Fourth, drawing on Sergii Bulgakov, I explore the idea of shadow sophia as representing a multivocal theodicy that is capable of holding together a tapestry of different theological responses to evil. Finally, I discuss the redemption of nature in the light of the foregoing discussion.     

Establishment of a schizophrenic animal model through chronic administration of MK-801 in infancy and social isolation in childhood

BackgroundAlthough an increasing amount of evidence supports a “two-hit” hypothesis for the neurodevelopmental model of schizophrenia, there has been no development in animal models to test this hypothesis.MethodsAn animal model was established by chronic administration of 0.1, 0.3, and 0.5 mg/kg MK-801 in P7-P21 rats followed by four weeks of social isolation in childhood and then five days of social housing. Animal behaviors were measured by the open field (OF) test, the novel object recognition (NOR) test, the prepulse inhibition (PPI) test, and the elevated plus maze (EPM) test.ResultsWe found a significant decrease in the NOR index in adolescent rats compared to saline control rats when administering 0.5 mg/kg of MK-801 (P = 0.02). We found that social isolation had no significant effect on NOR index, though social isolation significantly increased the total distance traveled and significantly decreased the resting time in adolescent rats in the OF test (P < 0.001 and P = 0.003, respectively). In contrast, we observed that MK-801 administration showed no significant effects on either total distance traveled or resting time. Both MK-801 administration and social isolation had no significant effect on the percent of PPI and startle amplitudes in adolescent rats. Social isolation significantly reduced the open arm entries in adolescent rats in the EPM test (P = 0.023), but it did not reduce the ratio to enter the open arms and the stay time in open arm. Administration of MK-801 showed no significant effect on the indexes of entering the open arms in the EPM test on adolescent rats.ConclusionMK-801 intervention in infancy is associated with the damage of long-term visual memory, whereas social isolation in childhood is associated with the increased spontaneous activity and anxiety levels. Administration of MK-801 in infancy and social isolation in childhood are two independent factors on the neurodevelopmental defects.     

从动物权利的讨论看道德的交互性本质

道德的交互性是人类道德生活的基本特征之一。有关动物权利的讨论能为我们清楚地揭示出这一点。它主要指向收益和负担之间的某种程度的均衡,对人类的道德实践提出了真正的挑战。     

The Opposite of Human Enhancement: Nanotechnology and the Blind Chicken Problem

Nanotechnologies that have been linked to the possibility of enhancing cognitive capabilities of human beings might also be deployed to reduce or eliminate such capabilities in non-human vertebrate animals. A surprisingly large literature on the ethics of such disenhancement has been developed in response to the suggestion that it would be an ethically defensible response to animal suffering both in medical experimentation and in industrial livestock production. However, review of this literature illustrates the difficulty of formulating a coherent ethical debate. Well structured arguments for disenhancement can be made on the basis of mainstream views on the basis of ethical obligations to animals, but these arguments have not been persuasive against the moral intuition that disenhancements are unethical. At the same time, attempts to ground these intuitions in a coherent philosophical doctrine have been plagued by logical fallacies and question begging assertions. As such, the debate over animal disenhancement forecasts an enduring conundrum with respect to the core question of transforming the nature of sentient beings, and this conundrum is logically independent of claims that relate either to the distinctive of human beings or to issues deriving from the emphasis on enhancement.