The roles of opioid receptors in pain and addiction have been extensively studied, but their
function in mood disorders has received less attention. Accumulating evidence from animal …

Although several pharmacological options to treat depression are currently available,
approximately one third of patients who receive antidepressant medications do not respond …

The endogenous opioid system consists of 3 families of opioid peptides, ß-endorphin,
enkephalins, and dynorphins, and 3 families of receptors, μ (MOR), δ (, DOR), and κ (KOR) …

This paper critically reviews the unidimensional construct of General Arousal as utilised by
models of temperament in differential psychology for example, to underlie 'Extraversion' …

The potentially serious outcomes from ingestion of and dependence on toxins make this an
important topic for epileptologists. We must be aware of the potential for harm from …

In the past decade, considerable attention has been drawn to social interactions and
behaviors as sources of pleasurable (social reward) and painful (social pain) emotional …

Epidemiological studies show the prevalence of opioid use, misuse and abuse in
adolescents, which imposes social and economic accountability worldwide. Chronic opioid …

The lexical approach is a method in differential psychology that uses people's estimations of
verbal descriptors of human behavior in order to derive the structure of human individuality …

Various lines of research indicate that sexual reward is mediated by opioids in both males
and females. In the first part I review basic ideas about sexual reward in humans followed by …

Emotion is a comprehensive text that integrates traditional psychological theories and
cutting-edge neuroscience research to explain the nature and role of emotions in human …