Are reinforcement sensitivity personality constructs and attentional control important predictors of restrictive disordered eating?

The revised Reinforcement Sensitivity Theory (rRST) perspective on personality suggests that a neuropsychological behavioural inhibition system (BIS), behavioural approach system (BAS), and a fight-flight-freeze system (FFFS) produce the key personality traits involved in approach and avoidance behaviours. This perspective on personality can be used as a framework for understanding psychopathology. Self-report research on rRST suggests that restrictive disordered eating relates to elevated BIS sensitivity, elevated FFFS sensitivity, and possibly dysfunctional BAS sensitivity. Disordered eating can also relate to reduced trait mindfulness, which is a broadly defined construct. Trait mindfulness is positively correlated with attentional control (AC) which is a more specific component of our cognitive architecture that incorporates attentional focusing and attentional shifting processes. It is unknown how BIS and AC interact to predict restrictive disordered eating. We tested how self-reported BIS, BAS, and FFFS sensitivity, AC, and trait mindfulness relate to restrictive disordered eating in 464 healthy participants, and 177 participants with a history of psychiatric disorder. We provide new evidence that elevated restrictive disordered eating relates to reduced self-reported AC abilities (in addition to elevated BIS, and elevated FFFS sensitivity). We illustrate that the combination of high BIS and low AC predicts high levels of restrictive disordered eating (but not in all participants), whereas low BIS and high AC predicts lower levels of restrictive disordered eating (but not in all participants). We discuss how understanding the relationship between personality and attentional control can inform the design of future intervention studies.