Title: PAIN SENSITIVITY IN CARIOCA HIGH- AND LOW-CONDITIONED FREEZING RATS.

Anxiety disorders (AD) comprise a broad range of psychiatric conditions, including general anxiety (GAD) and specific phobias. Several studies have shown that anxiety disorders have a comorbidity with chronic pain and that changes in brain-derived neurotrophic factor (BDNF) levels play a major role in the development of both anxiety disorders and chronic pain. For the last decades, the use of animal models of anxiety has offered important insights into the understanding of these psychopathologies.