Strain differences in coping behaviour, novelty seeking behaviour, and susceptibility to socially conditioned fear : a comparison between Wistar and Sprague Dawley rats

The aim of the current study was to generate socially conditioned fear in two different strains of rat (Wistar, W and Sprague Dawley, SD) using social conflict, in order to investigate whether the magnitude of the conditioned fear responses in each strain was related to behaviour exhibited prior to or during fear induction (i.e. social conflict). On day one of the study, all intruders were assessed for exploratory activity in a novel environment. Twenty four hours following the novel environment test the locomotor activity of the intruders was assessed, while they underwent a single familiarisation exposure to the arena in which the conflict was subsequently to occur in. Twenty-four hours following familiarisation, intruders underwent either a 10 min social conflict or sham conflict session. One day later we examined the response of the intruders when they were returned to the vacant resident's cage. Upon return to the conflict context, we examined the intruder's ultrasonic distress vocalisations and the extent to which locomotor activity was inhibited. We found that W rats displayed significantly more immobility (i.e. conditioned fear) upon return to context than did SD rats (p < 0.05). Importantly, we observed that the differences in the two strains behaviour upon return to context appeared to be related to their quite different patterns of coping behaviour. The results of the current study indicate that preclinical between-strain comparisons potentially have much to offer in regard to understanding the basis of resilience to social stress.

Ethical consumption : a critical introduction

A not-so-quiet revolution seems to be occurring in wealthy capitalist societies - supermarkets selling ‘guilt free’ Fairtrade products; lifestyle TV gurus exhorting us to eat less, buy local and go green; neighbourhood action groups bent on ‘swopping not shopping’. And this is happening not at the margins of society but at its heart, in the shopping centres and homes of ordinary people. Today we are seeing a mainstreaming of ethical concerns around consumption that reflects an increasing anxiety with - and accompanying sense of responsibility for - the risks and excesses of contemporary lifestyles in the ‘global north’.

This collection of essays provides a range of critical tools for understanding the turn towards responsible or conscience consumption and, in the process, interrogates the notion that we can shop our way to a more ethical, sustainable future. Written by leading international scholars from a variety of disciplinary backgrounds - and drawing upon examples from across the globe - Ethical Consumption makes a major contribution to the still fledgling field of ethical consumption studies. This collection is a must-read for anyone interested in the relationship between consumer culture and contemporary social life.

Predicting breakfast consumption: a comparison of the theory of planned behaviour and the health action process approach

Purpose: 

Stomach temperature records reveal nursing behaviour and transition to solid food consumption in an unweaned mammal, the harbour seal pup (Phoca vitulina)

Knowledge of milk transfer from mother to offspring and early solid food ingestions in mammals allows for a greater understanding of the factors affecting transition to nutritional independence and pre-weaning growth and survival. Yet studies monitoring suckling behaviour have often relied on visual observations, which might not accurately represent milk intake. We assessed the use of stomach temperature telemetry to monitor suckling and foraging behaviour in free-ranging harbour seal (Phoca vitulina) pups during lactation. Stomach temperature declines were analysed using principal component and cluster analyses, as well as trials using simulated stomachs resulting in a precise classification of stomach temperature drops into milk, seawater and solid food ingestions. Seawater and solid food ingestions represented on average 15.361.6% [0-40.0%] and 0.760.2% [0-13.0%], respectively, of individual ingestions. Overall, 63.7% of milk ingestions occurred while the pups were in the water, of which 13.9% were preceded by seawater ingestion. The average time between subsequent ingestions was significantly less for seawater than for milk ingestions. These results suggest that seawater ingestion might represent collateral ingestion during aquatic suckling attempts. Alternatively, as solid food ingestions (n = 19) were observed among 7 pups, seawater ingestion could result from missed prey capture attempts. This study shows that some harbour seals start ingesting prey while still being nursed, indicating that weaning occurs more gradually than previously thought in this species. Stomach temperature telemetry represents a promising method to study suckling behaviour in wild mammals and transition to nutritional independence in various endotherm species.

A meta-analysis of the effects of measuring theory of planned behaviour constructs on behaviour within prospective studies

Measurement reactivity effects, such as the mere measurement effect, have been proposed as a reason for behavioural changes in a number of theory of planned behaviour intervention studies. However, it is unclear whether such changes are the result of the mere measurement effect or of other artefacts of intervention study design. The aim of this study is to determine the size and direction of changes in health behaviours from baseline to follow-up in prospective studies using the theory of planned behaviour. Electronic databases were searched for the theory of planned behaviour studies which measured health behaviours at two or more time points. Change in behaviour was calculated for all studies. Sixty-six studies were included. Mean effect sizes across all studies were small and negative (d = -.03). Effect size was moderated by behaviour, behaviour type and follow-up length. Subgroup analyses showed significant decreases in socially undesirable behaviour (d = -.28), binge drinking (d = -.17), risk driving (d = -.20), sugar snack consumption (d = -.43) and sun-protective behaviour (d = -.18). Measurement of intention at baseline resulted in significant decreases in undesirable behaviour. Changes in undesirable behaviours reported in other studies may be the result of the mere measurement effect.

Relationships between problematic alcohol consumption and delinquent behaviour from adolescence to young adulthood

Abstract Background. Heavy episodic drinking (HED) has been associated with increased risk for short- and long-term injury and harms, such as violence and delinquent behaviour; however, the temporal relationship between the two remains unclear, pathways between HED and delinquent behaviour from adolescence to emerging adulthood. Methods. Data were drawn from the Australian Temperament Project; a population-based longitudinal study that has followed the health and development of participants (and parents) across 30 years from birth in 1982.The analytic sample was 1650 participants and included five measurement waves spanning adolescence (3 waves: 13–18 years) and young adulthood (2 waves; 19–24 years). Results. There was strong continuity across waves of both HED and delinquency, as well as across-time associations between them. Delinquent behaviour in adolescence was associated with up to twofold increases in the odds of HED at each subsequent adolescent wave. HED in the late teens was associated with over fourfold increases in the odds of persistent (two waves) HED in young adulthood. HED in the late teens was associated with increases in the odds of delinquent behaviour in young adulthood (over twofold for male and one and a half-fold for female participants). Conclusions. While delinquent behaviour predicts both future HED and future delinquent behaviour in adolescence, once young people reach the legal drinking age of 18 years, HED becomes a predictor of current and future delinquent behaviour and future HED, suggesting that increased access to alcohol increases the likelihood of young people engaging in delinquent behaviour. [Miller PG, Butler E, Richardson B, Staiger PK, Youssef GJ, Macdonald JA, Sanson A, Edwards B, Olsson CA. Relationships between problematic alcohol consumption and delinquent behaviour from adolescence to young adulthood. Drug Alcohol Rev 2015]

Male sexual behaviour and ethanol consumption from an evolutionary perspective: a comment on "Sexual deprivation increases ethanol intake in Drosophila"

Shohat-Ophir et al. (1) demonstrate a connection between sexual behaviour and ethanol consumption in male Drosophila flies, and how the neuropeptide F system regulates ethanol preference. Their results are rightly discussed only in a physiological context, but this has facilitated erroneous anthropomorphic interpretations by the media. Here we discuss the link between male sexual behaviour and ethanol consumption from an evolutionary perspective, providing a broader context to interpret their results.

A public health intervention to change knowledge, attitudes and behaviour regarding alcohol consumption in pregnancy

Aim. To evaluate the effectiveness of a public health intervention aimed at changing knowledge, attitudes and behaviour. Methods. A non-blinded parallel group randomised controlled trial of pregnant women over 18 years of age. Women were recruited in the second trimester and assigned to one of two treatment groups. Both groups completed an initial questionnaire assessing knowledge, attitudes, and practices relating to alcohol consumption during pregnancy. The intervention group then received a mocktail recipe booklet and participants were asked to share the information with their partner. The control group received standard antenatal care. A follow-up questionnaire was conducted four weeks post birth. Primary outcome measures were a knowledge score of the health risks associated with alcohol consumption during pregnancy and an attitude score toward drinking during pregnancy. Secondary outcome measures included whether or not the woman and her partner abstained from drinking. Ethical approval was granted by the Women’s and Children’s Health Network and the University of South Australia. Results. A total of 161 participants were recruited at baseline (intervention = 82, control = 79) and 96 participants completed the trial (intervention = 49, control = 47). The findings suggest that the mocktail booklet was effective at improving knowledge (p<0.001; effect size 0.80) and improving attitudes towards drinking during pregnancy (p=0.017; effect size 0.43) in the intervention group compared to the control group. Although women in the intervention group were 30% more likely to abstain from drinking than in the control group (RR=1.3, 95% CI 0.97 – 1.75), this result was not statistically significant (p=0.077). Conclusions. Knowledge regarding the effects of alcohol consumption as well as attitudes towards drinking significantly improved as a result of a mocktail recipe booklet. Improving knowledge and changing attitudes has the potential to change health behaviour. Therefore, this intervention may reduce the percentage of women who continue to drink alcohol while they are pregnant and improve outcomes for infants and children.

Benefits and barriers to the consumption of a vegetarian diet in Australia

Objective: The aim of this study was to examine consumers' perceived benefits and barriers to the consumption of a vegetarian diet.

Design: Survey (written questionnaire) that included questions on perceived benefits and barriers to the consumption of a vegetarian diet.

Setting: South Australia.

Subjects: Six hundred and one randomly selected South Australians.

Results: The main perceived barriers to adopting a vegetarian diet were enjoying eating meat and an unwillingness to alter eating habits. This was the case for men, women and all age groups, although there were sex and age differences present in over half of the barrier items. For example, family food preferences were a greater problem for women than for men, while the oldest group was more likely to agree that humans are ‘meant’ to eat meat than the younger groups. The main benefits associated with vegetarian diets were health benefits: increased fruit and vegetable intake, decreased saturated fat intake, weight control. Animal welfare-related benefits and disease prevention were also important. Age and sex differences were apparent, although age differences were more important than sex differences.

Conclusions: The majority of respondents perceived there to be health benefits associated with the consumption of a vegetarian diet, but also, predictably, enjoyed eating meat. Given this, it is likely that interest in plant-based diets that contain some meat is higher than that in no-meat diets. An understanding of the perceived benefits and barriers of consuming a vegetarian diet will allow the implementation of strategies to influence meat and vegetarianism beliefs, dietary behaviour and, hence, public health.