Can male Eurasian jays disengage from their own current desire to feed the female what she wants?

Humans'' predictions of another person''s behaviour are regularly influenced by what they themselves might know or want. In a previous study, we found that male Eurasian jays (Garrulus glandarius) could cater for their female partner''s current desire when sharing food with her. Here, we tested the extent to which the males'' decisions are influenced by their own current desire. When the males'' and female''s desires matched, males correctly shared the food that was desired by both. When the female''s desire differed from their own, the males'' decisions were not entirely driven by their own desires, suggesting that males also took the female''s desire into account. Thus, the male jays'' decisions about their mates'' desires are partially biased by their own desire and might be based upon similar processes as those found in humans.     

Rational desires and the limitation of life-sustaining treatment

It is accepted that treatment of previously competent, now incompetent patients can be limited if that is what the patient would desire, if she were now competent. Expressed past preferences or an advance directive are often taken to constitute sufficient evidence of what a patient would now desire. I distinguish between desires and rational desires. I argue that for a desire to be an expression of a person's autonomy, it must be or satisfy that person's rational desires. A person rationally desires a course of action if that person desires it while being in possession of all available relevant facts, without committing relevant error of logic, and "vividly imagining" what its consequences would be like for her. I argue that some competent, expressed desires obstruct autonomy. I show that several psychological mechanisms operate to prevent a person rationally evaluating what future life in a disabled state would be like. Rational evaluation is difficult. However, treatment limitation, if it is to respect autonomy, must be in accord with a patient's rational desires, and not merely her expressed desires. I illustrate the implications of these arguments for the use of advance directives and for the treatment of competent patients.     

Could sexual selection have made us psychological altruists?

Psychological altruism (being motivated by the needs of others) has a tendency to produce behaviour that is costly in evolutionary terms. How, then, could the capacity for psychological altruism evolve? One suggestion is that it is the result of sexual selection. There are, however, two problems that face such an account: first, it is not clear that the resulting behaviour would be altruistic in the relevant sense, and second, it does not seem to fit with key features of our actual helping behaviour. I will argue that both of these problems can be avoided if we adopt a modular account of desire formation.     

Rethinking Informed Consent in Research on Heroin‐Assisted Treatment

Can heroin addicts give consent to research on trials in which heroin is prescribed to them? Analyses of addicts and informed consent have been objects of debate in several articles. Informed consent requires the agent not only to be competent but also to give consent voluntarily. This has been questioned because of alleged features of heroin addiction. Until recently the discussion has focused on heroin addicts' desires for heroin, whether these are irresistible and thus pose a problem for giving consent. Still, in light of empirical evidence, there seems to be a consensus more or less that the problem is not whether the addicts can resist their desire for heroin. A recent article concentrates specifically on heroin addicts' false assumptions of options and voluntariness. We argue that the prevailing framing of the options in this discussion in terms of heroin and access to it is problematic. The way in which the options are typically laid out suggests an assumption that participation in the research is allegedly based on the addicts' views on using the drug. We argue that this way of presenting the options is, first, a mismatch to the studies carried out and, second, symptomatic of potential misconceptions about heroin addiction and addicts. Furthermore, we also suggest that the account of voluntariness needs to be realistic in order for subjects to be able to give consent voluntarily in actual situations, and for medical research to carry out studies on improving outcomes in addiction treatment in an ethical way.     

The evolution of theory of mind on welfare tradeoff ratios

People seem to attribute beliefs and desires to another person when interacting with them. Such a “theory of mind” capacity is essential for complex and uniquely human behavior such as language, but its evolutionary origin remains elusive. Using the formal tools of evolutionary game theory, we asked what environmental properties are necessary to select for a basic form of theory of mind—the ability to infer the prosociality, quantified by the welfare tradeoff ratio, of another person toward oneself. We found that none of the environments studied in classical or evolutionary game theory give an advantage to this form of theory of mind capacities; theory of mind is advantageous only in a new class of environments with stable opponents and variable payoff structures. In two behavioral experiments (n = 91) we verified that people can, and do use theory of mind in such an environment. These results suggest that some features of early humans’ social environment that were previously neglected in evolutionary game theory may be responsible for the evolution of people’s complex social capacities.     

ADDICTION AND AUTONOMY: CAN ADDICTED PEOPLE CONSENT TO THE PRESCRIPTION OF THEIR DRUG OF ADDICTION?

It is often claimed that the autonomy of heroin addicts is compromised when they are choosing between taking their drug of addiction and abstaining. This is the basis of claims that they are incompetent to give consent to be prescribed heroin. We reject these claims on a number of empirical and theoretical grounds. First we argue that addicts are likely to be sober, and thus capable of rational thought, when approaching researchers to participate in research. We reject behavioural evidence purported to establish that addicts lack autonomy. We present an argument that extrinsic forces must be irresistible in order to make a choice non-autonomous. We argue that heroin does not present such an irresistible force. We make a case that drug-oriented desires are strong regular appetitive desires, which do not compromise consent. Finally we argue that an addict's apparent desire to engage in a harmful act cannot be construed as evidence of irrational or compulsive thought. On these arguments, a sober heroin addict must be considered competent, autonomous and capable of giving consent. More generally, any argument against legalisation of drugs or supporting infringement of the liberty of those desiring to take drugs of addiction must be based on considerations of harm and paternalism, and not on false claims that addicts lack freedom of the will.     

Natural Conception May Be an Acceptable Option in HIV-Serodiscordant Couples in Resource Limited Settings

Many HIV serodiscordant couples have a strong desire to have their own biological children. Natural conception may be the only choice in some resource limited settings but data about natural conception is limited. Here, we reported our findings of natural conception in HIV serodiscordant couples. Between January 2008 and June 2014, we retrospectively collected data on 91 HIV serodiscordant couples presenting to Beijing Youan Hospital with childbearing desires. HIV counseling, effective ART on HIV infected partners, pre-exposure prophylaxis (PrEP) and post-exposure prophylaxis (PEP) in negative female partners and timed intercourse were used to maximally reduce the risk of HIV transmission. Of the 91 HIV serodiscordant couples, 43 were positive in male partners and 48 were positive in female partners. There were 196 unprotected vaginal intercourses, 100 natural conception and 97 newborns. There were no cases of HIV seroconversion in uninfected sexual partners. Natural conception may be an acceptable option in HIV-serodiscordant couples in resource limited settings if HIV-positive individuals have undetectable viremia on HAART, combined with HIV counseling, PrEP, PEP and timed intercourse.     

High connectivity among habitats precludes the relationship between dispersal and range size in tropical reef fishes

The hypothesis that pelagic larval duration (PLD) influences range size in marine species with a benthic adult stage and a pelagic larval period is intuitively attractive; yet, studies conducted to date have failed to support it. A possibility for the lack of a relationship between PLD and range size may stem from the failure of past studies to account for the effect of species evolutionary ages, which may add to the dispersal capabilities of species. However, if dispersal over ecological (i.e. PLD) and across evolutionary (i.e. species evolutionary age) time scales continues to show no effect on range size then an outstanding question is why? Here we collected data on PLD, evolutionary ages and range sizes of seven tropical fish families (five families were reef‐associated and two have dwell demersal habitats) to explore the independent and interactive effects of PLD and evolutionary age on range size. Separate analyses on each family showed that even after controlling for evolutionary age, PLD has an insignificant or a very small effect on range size. To shed light on why dispersal has such a limited effect on range size, we developed a global ocean circulation model to quantify the connectivity among tropical reefs relative to the potential dispersal conferred by PLD. We found that although there are several areas of great isolation in the tropical oceans, most reef habitats are within the reach of most species given their PLDs. These results suggest that the lack of habitat isolation can potentially render the constraining effect of dispersal on range size insignificant and explain why dispersal does not relate to range size in reef fishes.     

Eurasian jays (Garrulus glandarius) overcome their current desires to anticipate two distinct future needs and plan for them appropriately

Western scrub-jays (Aphelocoma californica) have been shown to overcome present satiety to cache food they will desire in the future. Here, we show that another corvid, the Eurasian jay (Garrulus glandarius), can distinguish between two distinct future desires and plan for each appropriately, despite experiencing a conflicting current motivation. We argue that these data address the criticisms of previous work, and suggest a way in which associative learning processes and future-oriented cognition may combine to allow prospective behaviour.     

The adaptive importance of cognitive efficiency: an alternative theory of why we have beliefs and desires

Finding out why we have beliefs and desires is important for a thorough understanding of the nature of our minds (and those of other animals). It is therefore unsurprising that several accounts have been presented that are meant to answer this question. At least in the philosophical literature, the most widely accepted of these are due to Kim Sterelny and Peter Godfrey-Smith, who argue that beliefs and desires evolved due to their enabling us to be behaviourally flexible in a way that reflexes do not—which, they claim, is beneficial in epistemically complex environments. However, as I try to make clear in this paper, upon closer consideration, this kind of account turns out to be theoretically implausible. In the main, this is because it fails to give due credit to the powers of reflex-driven organisms, which can in fact be just as flexible in their behaviour as ones that are belief/desire-driven. In order to improve on this account, I therefore propose that beliefs and desires evolved, not due to their enabling us to do something completely different from what reflexive organisms can do, but rather due to their enabling us to do the same things better. Specifically, I argue that beliefs and desires evolved for making the generation of behaviour more efficient, since they can simplify the necessary cognitive labour considerably. I end by considering various implications of this account.     

The other eukaryotes in light of evolutionary protistology

In order to introduce protists to philosophers, we outline the diversity, classification, and evolutionary importance of these eukaryotic microorganisms. We argue that an evolutionary understanding of protists is crucial for understanding eukaryotes in general. More specifically, evolutionary protistology shows how the emphasis on understanding evolutionary phenomena through a phylogeny-based comparative approach constrains and underpins any more abstract account of why certain organismal features evolved in the early history of eukaryotes. We focus on three crucial episodes of this history: the origins of multicellularity, the origin of sex, and the origin of the eukaryote cell. Despite ongoing uncertainty about where the root of the eukaryote tree lies, and residual questions about the precise endosymbioses that have produced a diversity of photosynthesizing eukaryotes, evolutionary protistology has illuminated with considerable clarity many aspects of protist evolution. Our main message in light of evolutionary protistology is that these ‘other eukaryotes’ are in fact the organisms through which the rest of the eukaryotes should be understood.     

Liberal rationalism and medical decision-making

I contrast Robert Veatch's recent liberal vision of medical decision-making with a more rationalist liberal model. According to Veatch, physicians are biased in their determination of what is in their patient's overall interests in favour of their medical interests. Because of the extent of this bias, we should abandon the practice of physicians offering what they guess to be the best treatment option. Patients should buddy up with physicians who share the same values —'deep value pairing'. The goal of choice is maximal promotion of patient values. I argue that if subjectivism about value and valuing is true, this move is plausible. However, if objectivism about value is true — that there really are states which are good for people regardless of whether they desire to be in them — then we should accept a more rationalist liberal alternative. According to this alternative, what is required to decide which course is best is rational dialogue between physicians and patients, both about the patient's circumstances and her values, and not the seeking out of people, physicians or others, who share the same values. Rational discussion requires that physicians be reasonable and empathic. I describe one possible account of a reasonable physician.     

Journeying Between Desire and Anthropology: A Story in Suspense

Anthropology is a discipline based on the motif of the journey and ‘the myth of the eternal return’. This is the journey out to the ‘other’in order to return to constitute ‘self, and this movement is a movement of desire. The desire is for wholeness, for self‐presence, for a unified self. It is a desire for origins. And this desire is evident in anthropological practices as it is in myths and fairytales—all tell stories that speak of the desire for a separate, an original, self. Yet ‘the myth of the eternal return’reveals that the enactment of the story is itself originating. The origin is not a thing to be hunted down and appropriated—it is no thing. Like the archetypes which flow through stories, it is alive in the telling. The story I tell in this paper is about my own desires. It speaks of the desire to undergo the rite of passage of anthropology, and of how this journey was interrupted by the anthropologist who always journeys before me. And yet. it is through the inextricable relations with the writings of the “other‘ anthropologist that alluring moments of different desiring are fleetingly revealed. In the end. my relations with anthropology tell of a paradox: of the desire for a transcendental journey in order to constitute self and the seductive desire for immersion—to lose self, the story remains in suspense.     

Birds Do It. Bees Do It. So Why Not Single Women and Lesbians?

Infertile couples have come to take assisted reproductive technologies (ART) for granted. An increasing number of single women and lesbian couples also desire to have children and turn to ART, especially donor insemination, to fulfill this desire. While most married couples find that access to ART is limited primarily by the ability to pay, for single women and lesbian couples, the story may be much different. In the United States, they may find that doctors and infertility clinics view their desires as immoral and refuse to accept them as patients, although other doctors and clinics readily accept them. In most other countries, however, it is against the law for single women and lesbian couples to make use of ART, including donor insemination.
In this paper I will argue that marital status and sexual orientation should not serve as a barrier to accessing the world of reproductive medicine. I will base this conclusion on two arguments. First, that justice requires that we treat like cases alike. Just as we would not accept or reject patients for cardiac rehabilitation programs based on factors such as a history of poor eating habits, so too we should not look at nonmedical factors such as marital status when deciding whether to treat infertility. For the second justification for the conclusion of equal access to ART, I will examine the concept of the family. I will argue that it is morally acceptable for single women and lesbian couples to have children and to head families.     

Birds do it. Bees do it. So why not single women and lesbians?

Infertile couples have come to take assisted reproductive technologies (ART) for granted. An increasing number of single women and lesbian couples also desire to have children and turn to ART, especially donor insemination, to fulfill this desire. While most married couples find that access to ART is limited primarily by the ability to pay, for single women and lesbian couples, the story may be much different. In the United States, they may find that doctors and infertility clinics view their desires as immoral and refuse to accept them as patients, although other doctors and clinics readily accept them. In most other countries, however, it is against the law for single women and lesbian couples to make use of ART, including donor insemination.
In this paper I will argue that marital status and sexual orientation should not serve as a barrier to accessing the world of reproductive medicine. I will base this conclusion on two arguments. First, that justice requires that we treat like cases alike. Just as we would not accept or reject patients for cardiac rehabilitation programs based on factors such as a history of poor eating habits, so too we should not look at nonmedical factors such as marital status when deciding whether to treat infertility. For the second justification for the conclusion of equal access to ART, I will examine the concept of the family. I will argue that it is morally acceptable for single women and lesbian couples to have children and to head families.     

The evolution of partial reproductive isolation as an adaptive optimum

Decades of theoretical work on the evolution of adaptive prezygotic isolation have led to an interesting finding—namely that stable partial reproductive isolation is a relatively common outcome. This conclusion is generally lost, however, in the desire to pinpoint when exactly speciation occurs. Here, we argue that the evolution of partial reproductive isolation is of great interest in its own right and matches empirical findings that ongoing hybridization is taxonomically widespread. We present the mechanisms by which partial reproductive isolation can be a stable evolutionary endpoint, concentrating on insights from theoretical studies. We focus not on cases in which hybridization results from constraints imposed by ongoing migration or mutation, but on the intriguing idea that partial reproductive isolation may instead be an adaptive optimum. We identify three general categories of selective mechanisms that can lead to partial reproductive isolation: context-dependent hybrid advantage, indirect selection due to the varying actions of sexual selection in different geographic contexts, and a balance of costs of choosiness with indirect selection for stronger mating preferences. By any of these mechanisms, stable partial reproductive isolation can potentially provide a robust evolutionary alternative to either complete speciation or population fusion.     

Artifactual phylogenies caused by correlated distribution of substitution rates among sites and lineages: the good, the bad, and the ugly

Despite the advances in understanding molecular evolution, current phylogenetic methods barely take account of a fraction of the complexity of evolution. We are chiefly constrained by our incomplete knowledge of molecular evolutionary processes and the limits of computational power. These limitations lead to the establishment of either biologically simplistic models that rarely account for a fraction of the complexity involved or overfitting models that add little resolution to the problem. Such oversimplified models may lead us to assign high confidence to an incorrect tree (inconsistency). Rate-across-site (RAS) models are commonly used evolutionary models in phylogenetic studies. These account for heterogeneity in the evolutionary rates among sites but do not account for changing within-site rates across lineages (heterotachy). If heterotachy is common, using RAS models may lead to systematic errors in tree inference. In this work we show possible misleading effects in tree inference when the assumption of constant within-site rates across lineages is violated using maximum likelihood. Using a simulation study, we explore the ways in which gamma stationary models can lead to wrong topology or to deceptive bootstrap support values when the within-site rates change across lineages. More precisely, we show that different degrees of heterotachy mislead phylogenetic inference when the model assumed is stationary. Finally, we propose a geometry-based approach to visualize and to test for the possible existence of bias due to heterotachy.     

The evolution and coexistence of generalist and specialist herbivores under between-plant competition

Consumer-resource models have been used extensively to study the evolution and coexistence of generalist and specialist consumers. However, current consumer-resource models do not take into account competition between resources or only incorporate intraspecific competition phenomenologically with, for example, a logistic growth function. Here, we mechanistically incorporate competition in an existing two-resource model, by introducing nutrient-limited resource growth and setting the total amount of nutrients (free or contained in consumers and resources) to a fixed value. In addition to the three combinations of generalists and specialists found in previous models, we find four other evolutionary outcomes, depending on the strength of the consumer trade-off: coexistence of one specialist and a generalist and three types of evolutionary cycling. Furthermore, which outcomes are most likely depends strongly on the combination of intrinsic growth rate of resources and the total amount of nutrients in the system. Our results suggest that the realistic assumption of nutrient competition may shed new light on the evolution of the multitude of strategies in real systems.     

<Emphasis Type="Italic">Hox</Emphasis> gene survey in the chaetognath<Emphasis Type="Italic"> Spadella cephaloptera</Emphasis>: evolutionary implications

We present the isolation of six Hox genes in the chaetognath Spadella cephaloptera. We identified one member of the paralogy group 3, four median genes and a mosaic gene that shares features of both median and posterior classes ( SceMedPost). Several hypotheses may account for the presence of a mosaic Hox gene in this animal. Here we propose that SceMedPost may represent an ancestral gene, which has not diverged totally into a posterior or a median one. This hypothesis has interesting implications for the reconstruction of the evolutionary history of Hox genes and suggests that Chaetognatha lineage divergence could predate the deuterostome/protostome split. Such a phylogenetic position is considered in the light of their embryological and morphological characters.     

Women’s sexual strategies in pregnancy

Humans exhibit an unusual pattern of sexual behavior compared to other mammalian females. Women's extended sexuality has been hypothesized to be related to a variety of possible benefits, especially non-genetic reproductive benefits, such as securing male investment via reinforced pairbonds or paternity confusion. But sexual behavior also comes at a cost, particularly for pregnant women, in terms of energetic costs, potential disease, and possible harm to the fetus. We hypothesize, therefore, that sexual behavior in pregnant women should reflect adaptive strategies and that pregnant women will be particularly strategic about their sexual behavior in order to maximize potential benefits while minimizing potential costs. One hundred twelve pregnant women completed a survey of their partners' qualities and their sexual desires toward their primary partners and men other than their primary partners. Results showed that women's perceptions of relationship threat positively predicted sexual desire for primary partners, while their perceptions of their partner's investing qualities negatively predicted sexual desire for extra-pair mates. These qualities, as well as cues to partner's genetic quality and gestation age, also interacted in ways that suggest that pregnant women's sexual desires are sensitive to cues of future investment and relationship stability.