This paper is the 28th consecutive installment of the annual review of research concerning
the endogenous opioid system, now spanning over a quarter-century of research. It …

Pain is a common word used to refer to a wide range of physical and mental states sharing
hedonic aversive value. Three types of pain are distinguished in this article: Physical pain …

Endogenous opioids, and in particular μ-opioid receptors, have been linked to hedonic and
rewarding mechanisms engaged during palatable food intake. The aim of this study was to …

Pérdida de recompensa como dolor psicológico. Este artículo resume una serie de trabajos
que sugieren un paralelo entre los mecanismos del dolor físico y el miedo, y los que …

The dorsomedial striatum (DMS) has been implicated in the acquisition of reward
representations, a proposal leading to the hypothesis that it should play a role in situations …

Paradigms used to study the response to and consequences of exposure to reward loss
have been underutilized in approaches to the psychobiology of substance use disorders …

Surprising downshifts from more preferred (training incentive) to less preferred incentives
(test incentive) are usually accompanied by emotional activation and suppression of …

This review is part of a special issue dedicated to Opioid addiction, and examines the
influential role of opioid peptides, opioid receptors and opiate drugs in mediating food intake …

The neural circuitry underlying behavior in reward loss situations is poorly understood. We
considered two such situations: reward devaluation (from large to small rewards) and …

Rats given access to a 32% sucrose solution and then downshifted to a 4% solution exhibit
less contact with the sipper tube than unshifted controls always given access to 4% solution …