Explaining costly religious practices: credibility enhancing displays and signaling theories.

This paper examines and contrasts two closely related evolutionary explanations in human behaviour: signalling theory, and the theory of Credibility Enhancing Displays (CREDs). Both have been proposed to explain costly, dangerous, or otherwise 'extravagant' social behaviours, especially in the context of religious belief and practice, and each have spawned significant lines of empirical research. However, the relationship between these two theoretical frameworks is unclear, and research which engages both of them (especially in systematic comparison) is largely absent. In this paper we seek to address this gap at the theoretical level, examining the core differences between the two approaches and prospects and conditions for future empirical testing. We clarify the dynamical and mechanistic bases of signalling and CREDs as explanatory models and contrast the previous uses to which they have been put in the human sciences. Because of idiosyncrasies regarding those uses (especially with signalling), several commonly supposed differences and comparative advantages are actually misleading and not in fact generalisable. We also show that signalling and CREDs theories as explanatory models are not interchangeable (or reducible to one another), because of deep structural differences. As we illustrate, the proposed causal networks of each theory are distinct, with important differences in the endogeneity of various phenomena within each model and their explanatory targets. As a result, they can be seen as complementary rather than in competition. We conclude by surveying the current state of the literature and identifying the differential predictions which could underpin more comprehensive empirical comparison in future research.

Not by signalling alone: Music's mosaicism undermines the search for a proper function.

Mehr et al. seek to explain music's evolution in terms of a unitary proper function - signalling cooperative intent - which they cash out in two guises, coalition signalling and (allo)parental attention signalling. Although we recognize the role signalling almost certainly played in the evolution of music, we reject "ultimate" causal explanations which focus on a unidirectional, narrow range of causal factors.

Unification at the cost of realism and precision.

Veissière et al. must sacrifice explanatory realism and precision in order to develop a unified formal model. Drawing on examples from cognitive archeology, we argue that this makes it difficult for them to derive the kinds of testable predictions that would allow them to resolve debates over the nature of human social cognition and cultural acquisition.

Moral externalisation fails to scale.

We argue that Stanford's picture of the evolution of externalised norms is plausible mostly because of the idealisations implicit in his defence of it. Once we take into account plausible amounts of normative disagreement, plausible amounts of error and misunderstanding, and the knock-on consequences of shunning, it is plausible that Stanford under-counts the costs of externalisation.

Social media and mobile apps for health promotion in Australian Indigenous populations: scoping review.

BACKGROUND: Health promotion organizations are increasingly embracing social media technologies to engage end users in a more interactive way and to widely disseminate their messages with the aim of improving health outcomes. However, such technologies are still in their early stages of development and, thus, evidence of their efficacy is limited. OBJECTIVE: The study aimed to provide a current overview of the evidence surrounding consumer-use social media and mobile software apps for health promotion interventions, with a particular focus on the Australian context and on health promotion targeted toward an Indigenous audience. Specifically, our research questions were: (1) What is the peer-reviewed evidence of benefit for social media and mobile technologies used in health promotion, intervention, self-management, and health service delivery, with regard to smoking cessation, sexual health, and otitis media? and (2) What social media and mobile software have been used in Indigenous-focused health promotion interventions in Australia with respect to smoking cessation, sexual health, or otitis media, and what is the evidence of their effectiveness and benefit? METHODS: We conducted a scoping study of peer-reviewed evidence for the effectiveness of social media and mobile technologies in health promotion (globally) with respect to smoking cessation, sexual health, and otitis media. A scoping review was also conducted for Australian uses of social media to reach Indigenous Australians and mobile apps produced by Australian health bodies, again with respect to these three areas. RESULTS: The review identified 17 intervention studies and seven systematic reviews that met inclusion criteria, which showed limited evidence of benefit from these interventions. We also found five Australian projects with significant social media health components targeting the Indigenous Australian population for health promotion purposes, and four mobile software apps that met inclusion criteria. No evidence of benefit was found for these projects. CONCLUSIONS: Although social media technologies have the unique capacity to reach Indigenous Australians as well as other underserved populations because of their wide and instant disseminability, evidence of their capacity to do so is limited. Current interventions are neither evidence-based nor widely adopted. Health promotion organizations need to gain a more thorough understanding of their technologies, who engages with them, why they engage with them, and how, in order to be able to create successful social media projects.

Preferences, predictions and patient enablement: a preliminary study.

BACKGROUND: The widely used patient enablement instrument (PEI) is sometimes contrasted against measures of patient satisfaction as being a more objective measure of consultation quality, in that it is less likely to be positively influenced by fulfilling pre-existing expectations for specific consultation outcomes (such as prescriptions or referrals). However the relationship between expectation and enablement is underexplored, as is the relationship between 'expectation' understood as a patient preference for outcome, and patient prediction of outcome. The aims of the study are to 1) assess the feasibility of measuring the relationship between expectation fulfilment and patient enablement, and 2) measure the difference (if any) between expectation understood as preference, and expectation understood as prediction. METHODS: A questionnaire study was carried out on 67 patients attending three General Practices in the Australian Capital Territory. Patient preferences and predictions for a range of possible outcomes were recorded prior to the consultation. PEI and the actual outcomes of the consultation were recorded at the conclusion of the consultation. Data analysis compared expectation fulfilment as concordance between the preferred, predicted, and actual outcomes, with the PEI as a dependant variable. RESULTS: No statistically significant relationship was found between either preference-outcome concordance and PEI, or prediction-outcome concordance. Statistically insignificant trends in both cases ran counter to expectations; i.e. with PEI (weakly) positively correlated with greater discordance. The degree of concordance between preferred outcomes and predicted outcomes was less than the concordance between either preferred outcomes and actual outcomes, or predicted outcomes and actual outcomes. CONCLUSIONS: The relationship between expectation fulfilment and enablement remains uncertain, whether expectation is measured as stated preferences for specific outcomes, or the predictions made regarding receiving such outcomes. However the lack of agreement between these two senses of 'patient expectation' suggests that explicitly demarcating these concepts during study design is strongly advisable.