What makes people cooperate? Individual differences in BAS/BIS predict strategic reciprocation in a public goods game

Heterogeneity in contribution levels within public goods games (PGGs) is indicative of individual self- or other-regarding preferences. Reward and punishment mechanisms have been demonstrated to affect contributions in the PGGs. This paper examines whether dispositional sensitivities to rewards and punishments (BIS and BAS) explain some behavioural heterogeneity in PGGs. Seventy-two participants took part in a sequential PGG, in which, prior to making a decision about contributing, participants received information about how much their co-players had donated, which was manipulated either as high or low. They also completed the Carver and White BIS/BAS scales. Participants contributed more when other members of their group contributed a high proportion of the initial endowment and less when others gave a low amount. When participants knew that their group members had contributed a high amount, BAS Reward Responsiveness was significantly negatively correlated with the contribution levels, while BIS-anxiety was positively related to a lower proportion of zero contributions. The findings are interpreted in relation to strategic responding in the PGGs. Motivational traits, such as those conceptualized in Reinforcement Sensitivity Theory, are proposed to underlie pro-social behavioural preferences.     

Sunscreen Safety: The Precautionary Principle, The Australian Therapeutic Goods Administration and Nanoparticles in Sunscreens

The ‘Precautionary Principle’ provides a somewhat ill-defined guide, often of uncertain normative status, for those exercising administrative decision-making power in circumstances where that may create potential risks to human health or the environment. This paper seeks to explore to what extent the precautionary principle should have been and was in fact utilised by the Australian Therapeutic Goods Administration (TGA) in its decision to approve the marketing of sunscreens containing titanium dioxide (TiO₂) and zinc oxide (ZnO) in nanoparticulate form. In particular, this article assesses to what extent better application of that principle might have altered the TGA’s decision that TiO₂ and ZnO ENPs in sunscreens do not require new safety testing, because they are considered to be functionally equivalent to their bulk counterparts.

Psychologie du frisson esthétique

This study concerns the problem of aesthetic emotions and that of aesthetic chills in particular. We asked thirty subjects to describe a narrative structure (film, play, book) eliciting chills and the phenomenology of the aesthetic experience. A number of non-random redundancies are observable. The stimuli eliciting positive aesthetic chills in our population have a sensorial dimension and their particular properties are often the selfless actions, existential considerations of a very general nature (e.g., the meaning of life), moments of inner recollection or quiet reflection, situations of solidarity and communion (family, couple, friends) or, on the contrary, situations of violent separation (family, couple, friends). In general, when real events are at stake (and not fictional scenes as in a film or a novel), subjects describe situations where they are safe, where they trust the environment.     

Are consonant intervals music to their ears? Spontaneous acoustic preferences in a nonhuman primate

Humans find some sounds more pleasing than others; such preferences may underlie our enjoyment of music. To gain insight into the evolutionary origins of these preferences, we explored whether they are present in other animals. We designed a novel method to measure the spontaneous sound preferences of cotton-top tamarins, a species that has been extensively tested for other perceptual abilities. Animals were placed in a V-shaped maze, and their position within the maze controlled their auditory environment. One sound was played when they were in one branch of the maze, and a different sound for the opposite branch; no food was delivered during testing. We used the proportion of time spent in each branch as a measure of preference. The first two experiments were designed as tests of our method. In Experiment 1, we used loud and soft white noise as stimuli; all animals spent most of their time on the side with soft noise. In Experiment 2, tamarins spent more time on the side playing species-specific feeding chirps than on the side playing species-specific distress calls. Together, these two experiments suggest that the method is effective, providing a spontaneous measure of preference. In Experiment 3, however, subjects showed no preference for consonant over dissonant intervals. Finally, tamarins showed no preference in Experiment 4 for a screeching sound (comparable to fingernails on a blackboard) over amplitude-matched white noise. In contrast, humans showed clear preferences for the consonant intervals of Experiment 3 and the white noise of Experiment 4 using the same stimuli and a similar method. We conclude that tamarins' preferences differ qualitatively from those of humans. The preferences that support our capacity for music may, therefore, be unique among the primates, and could be music-specific adaptations.     

Is children’s wellbeing different from adults’ wellbeing?

ABSTRACT

Call generalism about children’s and adults’ wellbeing the thesis that the same theory of wellbeing applies to both children and adults. Our goal is to examine whether generalism is true. While this question has not received much attention in the past, it has recently been suggested that generalism is likely to be false and that we need to elaborate different theories of children’s and adults’ wellbeing. In this paper, we defend generalism against the main objections it faces and make a positive case for it.