Impulsivity: four ways five factors are not basic to addiction

Several impulsivity-related models have been applied to understanding the vulnerability to addiction. While there is a growing consensus that impulsivity is multifaceted, debate continues as to the precise number of facets and, more critically, which are most relevant to explaining the addiction-risk profile. In many ways, the current debate mirrors that which took place in the personality literature in the early 1990s (e.g., Eysenck's 'Big Three' versus Costa and McCrae's 'Big Five'). Indeed, many elements of this debate are relevant to the current discussion of the role of impulsivity in addictive behavior. Specifically, 1) the use of factor analysis as an atheoretical 'truth-grinding machine'; 2) whether additional facets add explanatory power over fewer; 3) the delineation of specific neurocognitive pathways from each facet to addictive behaviors, and; 4) the relative merit of 'top-down' versus 'bottom-up' approaches to the understanding of impulsivity. Ultimately, the utility of any model of impulsivity and addiction lies in its heuristic value and ability to integrate evidence from different levels of analysis. Here, we make the case that theoretically-driven, bottom-up models proposing two factors deliver the optimal balance of explanatory power, parsimony, and integration of evidence. (C) 2014 Elsevier Ltd. All rights reserved

Junk food advertising moderates the indirect effect of reward sensitivity and food consumption via the urge to eat

The current study aimed to identify how underlying individual differences increases vulnerability to television food advertising. In particular, this study examined how reward sensitivity, a biologically-based predisposition to approach rewards (such as appetitive foods) in the environment, influenced participants' vulnerability to television food advertising and subsequent food consumption. Ninety-eight participants were randomly assigned to a cue condition (food cues versus non-food cues) and then viewed a 30 min documentary interrupted by advertising featuring a mix of food and neutral advertising (food cue condition) or only neutral advertising (non-food cue condition). Participants' reward sensitivity, approach motivation measured as urge to eat, and food consumption were recorded. Moderated mediation regression analyses revealed the positive association between reward sensitivity and food consumption was mediated by an increase in urge to eat, but only when participants were exposed to food advertising. These findings suggest heightened reward sensitivity, exposure to appetitive food cues, and approach motivation are key interacting mechanisms that may lead to maladaptive eating behaviours

Reward sensitivity and food addiction in women

Sensitivity to the rewarding properties of appetitive substances has long been implicated in excessive consumption of palatable foods and drugs of abuse. Previous research focusing on individual differences in reward responsiveness has found heightened trait reward sensitivity to be associated with binge-eating, hazardous drinking, and illicit substance use. Food addiction has been proposed as an extreme form of compulsive-overeating and has been associated with genetic markers of heightened reward responsiveness. However, little research has explicitly examined the association between reward sensitivity and food addiction. Further, the processes by which individual differences in this trait are associated with excessive over-consumption has not been determined. A total of 374 women from the community completed an online questionnaire assessing reward sensitivity, food addiction, emotional, externally-driven, and hedonic eating. High reward sensitivity was significantly associated with greater food addiction symptoms (r\ua0=\ua00.31). Bootstrapped tests of indirect effects found the relationship between reward sensitivity and food addiction symptom count to be uniquely mediated by binge-eating, emotional eating, and hedonic eating (notably, food availability). These indirect effects held even when controlling for BMI, anxiety, depression, and trait impulsivity. This study further supports the argument that high levels of reward sensitivity may offer a trait marker of vulnerability to excessive over-eating, beyond negative affect and impulse-control deficits. That the hedonic properties of food (especially food availability), emotional, and binge-eating behavior act as unique mediators suggest that interventions for reward-sensitive women presenting with food addiction may benefit from targeting food availability in addition to management of negative affect

Exposure to food cues moderates the indirect effect of reward sensitivity and external eating via implicit eating expectancies

Previous research has suggested that the expectancy "eating is rewarding" is one pathway driving the relationship between trait reward sensitivity and externally-driven eating. The aim of the current study was to extend previous research by examining the conditions under which the indirect effect of reward sensitivity and external eating via this eating expectancy occurs. Using a conditional indirect effects approach we tested the moderating effect of exposure to food cues (e.g., images) relative to non-food cues on the association between reward sensitivity and external eating, via eating expectancies. Participants (N\ua0=\ua0119, M\ua0=\ua018.67 years of age, SD\ua0=\ua02.40) were university women who completed a computerised food expectancies task (E-TASK) in which they were randomly assigned to either an appetitive food cue condition or non-food cue condition and then responded to a series of eating expectancy statements or self-description personality statements. Participants also completed self-report trait measures of reward sensitivity in addition to measures of eating expectancies (i.e., endorsement of the belief that eating is a rewarding experience). Results revealed higher reward sensitivity was associated with faster reaction times to the eating expectancies statement. This was moderated by cue-condition such that the association between reward sensitivity and faster reaction time was only found in the food cue condition. Faster endorsement of this belief (i.e., reaction time) was also associated with greater external eating. These results provide additional support for the proposal that individuals high in reward sensitivity form implicit associations with positive beliefs about eating when exposed to food cues

Personality, cognition and hazardous drinking: support for the 2-Component Approach to Reinforcing Substances Model

Personality and cognitive processes are both related to alcohol use and misuse. A recent model of hazardous drinking referred, the 2-CARS model, postulates two major pathways to hazardous drinking. One pathway primarily involves the association between Reward Drive and Positive Outcome Expectancies, the second involves the association between Rash Impulsiveness and Drinking Refusal Self-Efficacy. In previous tests of the model, Drinking Refusal Self-Efficacy was found to have the most proximal impact on drinking, being directly influenced by Rash Impulsiveness, and indirectly influenced by Reward Drive through Positive Outcome Expectancies. The aim of the current study was to test the 2-CARS model in a larger independent sample. Results found that individuals with a strong Reward Drive showed higher Positive Outcome Expectancies, while individuals high in Rash Impulsiveness were more likely to report reduced Drinking Refusal Self-Efficacy. The present results also showed a theoretically unexpected pathway with a direct association between Rash Impulsiveness and Positive Outcome Expectancies. However, overall the results support the view that a greater understanding of hazardous drinking can be achieved by investigating the relationship between these personality and cognitive variables. (C) 2013 Elsevier Ltd. All rights reserved

The Role of Reward Sensitivity and Impulsivity in Overeating and Food Addiction

Purpose of Review: This paper reviews the contribution of individual differences in two personality traits linked to addiction and over-consumption—impulsivity and reward sensitivity—in the context of overeating and food addiction. Recent Findings: There has been a rapid increase in the number of studies into overeating with a specific focus of late on food addiction. This review found trait impulsivity to be consistently associated with overeating and food addiction, while reward sensitivity has met with mixed results. While associated with overeating and food-cued cravings, reward sensitivity is less frequently associated with food addiction. Summary: The inclusion of impulsivity-related traits has gathered momentum in recent years adding additional understanding of individual factors that play roles in overeating that may lead to more severe overeating and obesity. Greater research is now required to determine the processes by which trait impulsivity and reward sensitivity lead to overeating behaviours

Addictive behaviors and addiction-prone personality traits: associations with a dopamine multilocus genetic profile

Increased obesity rates, an evolving food supply and the overconsumption of energy dense foods has led to an increase in research exploring addictive eating behaviours. This study aimed to investigate food addiction in a sample of Australian adults using the revised Yale Food Addiction Survey (YFAS) 2.0 tool and how it is associated with dietary intake, personality traits and mental health issues. Australian adults were invited to complete an online survey that collected information including: demographics, dietary intake, depression, anxiety, stress and personality dimensions including impulsivity, sensation seeking, hopelessness and anxiety sensitivity. A total of 1344 individuals were recruited with the samples comprising 75.7% female, mean age 39.8 ± 13.1 years (range 18-91 years) and body mass index BMI 27.7 ± 9.5. Food addiction was identified in 22.2% of participants using the YFAS 2.0 tool, which classified the severity of food addiction as "mild" in 0.7% of cases, "moderate" in 2.6% and "severe" in 18.9% of cases. Predictors of severe food addiction were female gender (odds ratio (OR) 3.65 95% CI 1.86-7.11) and higher levels of soft drink OR 1.36 (1.07-1.72), confectionary consumption and anxiety sensitivity 1.16 (1.07-1.26). Overall people with "severe" (OR 13.2, 5.8-29.8) or extremely severe depressive symptoms (OR 15.6, range 7.1-34.3) had the highest odds of having severe food addiction. The only variable that reduced the odds of having severe food addiction was vegetable intake. The current study highlights that addictive food behaviours are associated with a complex pattern of poor dietary choices and a clustering with mental health issues, particularly depression

How do Dysfunctional Eating and Hazardous Drinking Women Perform on Behavioural Measures of Reward and Punishment Sensitivity?

There is growing evidence that heightened reward sensitivity is a common feature in both dysfunctional eating and alcohol misuse. Punishment sensitivity is a feature of dysfunctional eating, but has a mixed association with alcohol misuse. Most research in this area has used self-report measures of reward and punishment sensitivity with relatively little research using specific laboratory tasks to measure approach and avoidance behaviour. One hundred and thirty-one women completed two behavioural tasks in which delivery of rewards and punishments were manipulated. Performance on the behavioural measure of punishment sensitivity was associated with self-reported punishment sensitivity, trait anxiety and dysfunctional eating, but not with level of hazardous drinking. However, comorbid women inhibited their response to a punished cue more than hazardous drinking only women. Although self-reported reward sensitivity and impulsivity were associated with dysfunctional eating and hazardous drinking, performance on a card-sorting task of reward sensitivity failed to correlate with self-reported reward sensitivity/impulsivity or disordered behaviour. The study supports the proposal that dysfunctional eating women are more sensitive to cues of threat in the environment than non-dysfunctional eating women