A multidisciplinary investigation into socioeconomic variation in behaviour

PhD ThesisSocioeconomic differences in behaviour are widely documented, but are not yet well understood. I propose that they can be better understood by using concepts from evolutionary theory. Evolutionary theory predicts that mortality risk should be important in determining life history traits such as the scheduling of growth and reproduction. An extension of this concept is that mortality risk should influence the degree to which people value benefits and costs in the present versus those in the future. Thus, many socioeconomic differences in behaviour may represent differences in time perspective, generated by inequalities in mortality risk. This raises the question of what cues evolved psychological mechanisms rely on when forming their estimates of personal mortality risk. I first report a test of the hypothesis that the deaths of others are used as a cue to mortality risk. The results showed that experiences of close bereavement are associated with steeper future discounting and earlier ideal, and actual, reproductive timing (Chapter 2). I then report the results of two experimental tests of whether the ages of others might be used as an indicator of local mortality rates. Manipulating the age profiles of sets of faces viewed in laboratory experiments did not have a clear effect on future discounting or reported ideal reproductive timing (Chapter 3). I move on to testing the hypothesis that the controllability of mortality risks should be most important for behaviour. The results of a correlational study showed that perceived extrinsic mortality risk mediated the association between socioeconomic status and effort spent looking after health (Chapter 4). I then report three experiments that demonstrate that priming participants to feel that prevailing sources of mortality risk are, or are not, controllable alters a simple health behaviour – the choice of a healthy food reward (Chapter 5). Finally, I review the bigger picture of socioeconomic differences in behaviour. I explain how the lack of control associated with lower socioeconomic status may lead to present-oriented behaviour in a range of domains – a phenomenon that I have called the Behavioural Constellation of Deprivation. I highlight some principles from evolutionary theoretical models that can deepen our understanding of how socioeconomic inequalities can become amplified and embedded. I discuss mechanisms by which extrinsic mortality risk may influence behaviour. I then review the evidence in support of my position, highlighting the fact that many researchers working from different perspectives have converged on control and time perspective as explanations for socioeconomic differences in behaviour. I finish by discussing the wider implications of my thesis and some of the related questions which could be answered in future research (Chapter 6 & 7)

The behavioural constellation of deprivation: Causes and consequences

Socioeconomic differences in behaviour are pervasive and well documented, but their causes are not yet well understood. Here, we make the case that a cluster of behaviours is associated with lower socioeconomic status (SES), which we call “the behavioural constellation of deprivation.” We propose that the relatively limited control associated with lower SES curtails the extent to which people can expect to realise deferred rewards, leading to more present-oriented behaviour in a range of domains. We illustrate this idea using the specific factor of extrinsic mortality risk, an important factor in evolutionary theoretical models. We emphasise the idea that the present-oriented behaviours of the constellation are a contextually appropriate response to structural and ecological factors rather than a pathology or a failure of willpower. We highlight some principles from evolutionary theoretical models that can deepen our understanding of how socioeconomic inequalities can become amplified and embedded. These principles are that (1) small initial disparities can lead to larger eventual inequalities, (2) feedback loops can embed early-life circumstances, (3) constraints can breed further constraints, and (4) feedback loops can operate over generations. We discuss some of the mechanisms by which SES may influence behaviour. We then review how the contextually appropriate response perspective that we have outlined fits with other findings about control and temporal discounting. Finally, we discuss the implications of this interpretation for research and policy

The relationships between exercise and affective states: a naturalistic, longitudinal study of recreational runners

Background Although people generally feel more positive and more energetic in the aftermath of exercise than before, longitudinal research on how exercise relates to within-person fluctuations in affect over the course of everyday life is still relatively limited. One constraint on doing such research is the need to provide participants with accelerometers to objectively record their exercise, and pagers to capture affective reports. Aims We aimed to develop a methodology for studying affect and exercise using only technology that participants already possess, namely GPS running watches and smartphones. Using this methodology, we aimed to characterize within-individual fluctuations in affective valence and arousal in relation to bouts of exercise, and explore possible moderators of these fluctuations. Methods We recruited a sample of 38 recreational runners. Participants provided daily affective reports for six weeks using their smartphones. Information on their runs was harvested from their own GPS devices via an online platform for athletes. Results Average valence and arousal were higher on days when the person had run than on the next day, and higher the day after a run than on the days after that. Over the course of the day of a run, valence and arousal declined significantly as the time since the run increased. Physically fitter participants had more positive valence overall, and this was particularly true when they had not run recently. There was some evidence of higher-dose (i.e., longer and faster) runs being associated with lower arousal on the next and subsequent days. Gender did not moderate associations between running and valence or arousal. Discussion Our study demonstrated the potential for studying the associations between affect and exercise in a way that is precise, undemanding for participants, and convenient for researchers, using technologies that participants already own and use

Cross-country relationships between life expectancy, intertemporal choice and age at first birth

Humans, like other animals, typically discount the value of delayed rewards relative to those available in the present. From an evolutionary perspective, prioritising immediate rewards is a predictable response to high local mortality rates, as is an acceleration of reproductive scheduling. In a sample of 46 countries, we explored the cross-country relationships between average life expectancy, intertemporal choice, and women's age at first birth. We find that, across countries, lower life expectancy is associated with both a smaller percentage of people willing to wait for a larger but delayed reward, as well as a younger age at first birth. These results, which hold when controlling for region and economic pressure (GDP-per capita), dovetail with findings at the individual level to suggest that life expectancy is an important ecological predictor of both intertemporal and reproductive decision-making

COVID-19: the relationship between perceptions of risk and behaviours during lockdown

Aim Understanding COVID-19 risk perceptions and their impact on behaviour can improve the effectiveness of public health strategies. Prior evidence suggests that, when people perceive uncontrollable risks to their health, they are less likely to engage in healthful behaviour. This article aims to understand the extent to which COVID-19 is perceived as an uncontrollable risk, and to assess whether this perceived risk is associated with health behaviour. Subject and methods We surveyed a nationally representative sample of 496 participants during the first UK lockdown. We assessed perceptions of COVID-19-related risk, self-reported adherence to infection control measures recommended by the UK Government, and general health behaviours. We predicted that increased perceived extrinsic mortality risk (the portion of mortality risk perceived to be uncontrollable) would disincentivise healthy behaviour. Results Perceived threat to life was the most consistent predictor of reported adherence to infection control measures. Perceived extrinsic mortality risk was found to have increased due to the pandemic, and was associated with lower reported adherence to Government advice on diet, physical activity, and smoking. Conclusions Our findings suggest that health messages that highlight threat to life may be effective in increasing adherence to infection control, but may also lead to a reduction in health-promoting behaviours. We suggest that messages that highlight threat to life should be accompanied by statements of efficacy. Further, messages evoking feelings of concern for others may be effective in promoting compliance with anti-infection measures, without the potential for the unwelcome side-effect of discouraging healthy behaviour

The influence of mortality and socioeconomic status on risk and delayed rewards: a replication with British participants

Here, we report three attempts to replicate a finding from an influential psychological study (Griskevicius et al., 2011b). The original study found interactions between childhood SES and experimental mortality-priming condition in predicting risk acceptance and delay discounting outcomes. The original study used US student samples. We used British university students (replication 1) and British online samples (replications 2 and 3) with a modified version of the original priming material, which was tailored to make it more credible to a British audience. We did not replicate the interaction between childhood SES and mortality-priming condition in any of our three experiments. The only consistent trend of note was an interaction between sex and priming condition for delay discounting. We note that psychological priming effects are considered fragile and often fail to replicate. Our failure to replicate the original finding could be due to demographic differences in study participants, alterations made to the prime, or other study limitations. However, it is also possible that the previously reported interaction is not a robust or generalizable finding

Food insecurity and patterns of dietary intake in a sample of UK adults

The aim of this study was to identify the dietary-intake correlates of food insecurity in UK adults. We recruited groups of low-income participants who were classified as food insecure (n = 196) or food secure (n = 198). Participants completed up to five 24h dietary recalls. There was no difference in total energy intake by food insecurity status (βFI = −0.06, 95% CI −0.25 to 0.13). Food insecure participants consumed a less diverse diet, as evidenced by fewer distinct foods per meal (βFI = −0.27, 95% CI −0.47 to −0.07), and had more variable time gaps between meals (βFI = 0.21, 95% CI 0.01 to 0.41). These associations corresponded closely to those found in a recent U.S. study using similar measures, suggesting that the dietary intake signature of food insecurity generalizes across populations. The findings suggest that the consequences of food insecurity for weight gain and health are not due to increased energy intake. We suggest that there may be important health and metabolic effects of temporal irregularity in dietary intake, which appears to be an important component of food insecurity

Frontline Allied Health Professionals in a Tertiary Children’s Hospital: Moving Forward Research Capacity, Culture and Engagement

Higher levels of research activity within healthcare contexts are known to result in improvements to staff and patient satisfaction as well as treatment outcomes. In the United Kingdom (UK), clinical academic careers for Allied Health Professionals (AHPs) are a key priority development area. This article presents the results of a study that aimed to scope the research capacity of four AHP professions in a tertiary children’s hospital using the Research Capacity and Culture Tool. This tool captures individuals’ views of success or skill required for a number of research-related items within the three domains of individual, team and organisation. Response rate ranged between 45-71% across the four groups. Reported barriers to carrying out research included a lack of time, clinical work taking priority, and lack of suitable backfill (i.e., employing a therapist to cover the clinical post for the AHP to complete research activity). Motivators, on the other hand, included skill development, career advancement, and increased job satisfaction. As a first step to strengthen research skills, a systematic process was used to devise a suite of supportive strategies targeting the individuals’ perceived gaps in their research abilities across four pillars: (i) awareness, (ii) accessibility, (iii) opportunity and capacity, and (iv) knowledge and skills. This process drew on previously published accounts of successful research capacity and culture development, as well as the unique needs of staff at this tertiary children’s hospital. The outcome of this process was a structured framework to support research capacity, culture and engagement. The specific details of this framework are reported in this article together with further recommendations to promote research capacity, culture and engagement amongst AHPs

The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey

The Sloan Digital Sky Survey III (SDSS-III) presents the first spectroscopic data from the Baryon Oscillation Spectroscopic Survey (BOSS). This ninth data release (DR9) of the SDSS project includes 535,995 new galaxy spectra (median z=0.52), 102,100 new quasar spectra (median z=2.32), and 90,897 new stellar spectra, along with the data presented in previous data releases. These spectra were obtained with the new BOSS spectrograph and were taken between 2009 December and 2011 July. In addition, the stellar parameters pipeline, which determines radial velocities, surface temperatures, surface gravities, and metallicities of stars, has been updated and refined with improvements in temperature estimates for stars with T_eff<5000 K and in metallicity estimates for stars with [Fe/H]>-0.5. DR9 includes new stellar parameters for all stars presented in DR8, including stars from SDSS-I and II, as well as those observed as part of the SDSS-III Sloan Extension for Galactic Understanding and Exploration-2 (SEGUE-2). The astrometry error introduced in the DR8 imaging catalogs has been corrected in the DR9 data products. The next data release for SDSS-III will be in Summer 2013, which will present the first data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) along with another year of data from BOSS, followed by the final SDSS-III data release in December 2014.Comment: 9 figures; 2 tables. Submitted to ApJS. DR9 is available at http://www.sdss3.org/dr

Cost Effectiveness of a Potential Vaccine for Human papillomavirus

Human papillomavirus (HPV) infection, usually a sexually transmitted disease, is a risk factor for cervical cancer. Given the substantial disease and death associated with HPV and cervical cancer, development of a prophylactic HPV vaccine is a public health priority. We evaluated the cost-effectiveness of vaccinating adolescent girls for high-risk HPV infections relative to current practice. A vaccine with a 75% probability of immunity against high-risk HPV infection resulted in a life-expectancy gain of 2.8 days or 4.0 quality-adjusted life days at a cost of $246 relative to current practice (incremental cost effectiveness of$22,755/quality-adjusted life year [QALY]). If all 12-year-old girls currently living in the United States were vaccinated, >1,300 deaths from cervical cancer would be averted during their lifetimes. Vaccination of girls against high-risk HPV is relatively cost effective even when vaccine efficacy is low. If the vaccine efficacy rate is 35%, the cost effectiveness increases to $52,398/QALY. Although gains in life expectancy may be modest at the individual level, population benefits are substantial