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The study of emotions has rapidly expanded in recent decades, incorporating interdisciplinary research on the genetic underpinnings and neural mechanisms of emotion. This has involved a wide range of methods from as varied fields as behavioral genetics, molecular biology, and cognitive neuroscience, and has allowed researchers to start addressing complex multi-level questions such as: what is the role of genes in individual differences in emotions and emotional vulnerability to psychopathology, and what are the neural mechanisms through which genes and experience shape these emotion? Genes, Brain, and Emotions: Interdisciplinary and translational perspectives offers a comprehensive account of this interdisciplinary field of research, bridging psychology, genetics, and neuroscience, with rich sections dedicated to methods, cognitive and biological mechanisms, and psychopathology. Written by leading researchers who have each inspired new research directions and innovated methods and concepts, this book will be of interest to anyone working or studying in the field of affective science, whether they be behavioural geneticists, psychologists and psychiatrists, or cognitive neuroscientists.

Glutamate and GABA play an important role in substance dependence. However, it remains unclear whether this holds true for different substance use disorders and how this is related to risk-related traits such as impulsivity. We, therefore, compared Glx (as a proxy measure for glutamate) and GABA concentrations in the dorsal anterior cingulate cortex (dACC) of 48 male cigarette smokers, 61 male smoking polysubstance users, and 90 male healthy controls, and investigated the relationship with self-reported impulsivity and substance use. Glx and GABA concentrations were measured using proton Magnetic Resonance Spectroscopy. Impulsivity, smoking, alcohol and cocaine use severity and cannabis use were measured using self-report instruments. Results indicate a trend towards group differences in Glx. Post-hoc analyses showed a difference between smokers and healthy controls (p=0.04) and a trend towards higher concentrations in smoking polysubstance users and healthy controls (p=0.09), but no differences between smokers and smoking polysubstance users. dACC GABA concentrations were not significantly different between groups. Smoking polysubstance users were more impulsive than smokers, and both groups were more impulsive than controls. No significant associations were observed between dACC neurotransmitter concentrations and impulsivity and level and severity of smoking, alcohol or cocaine use or the presence of cannabis use. The results indicate that differences in dACC Glx are unrelated to type and level of substance use. No final conclusion can be drawn on the lack of GABA differences due to assessment difficulties. The relationship between dACC neurotransmitter concentrations and cognitive impairments other than self-reported impulsivity should be further investigated.