Anxiety is an unpleasant physiological state in which an overreaction to a situation occurs. It
has been suggested that different brain regions are involved in the modulation and …

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 …

Emotions are states of vigilant readiness that guide human and animal behaviour during
survival‐salient situations. Categorical models of emotions posit neurally and …

Zebrafish (Danio rerio) are becoming increasingly popular in neurobehavioral research.
Here, we summarize recent data on behavioral responses of adult zebrafish to a wide …

Major depressive disorder is associated with lowered mood, anxiety, anhedonia, sleep
problems, and cognitive impairments. Many of these functions are regulated by μ-opioid …

Active and passive avoidance behaviors involve either emitting or omitting a response to
avoid potential harm. Both are key components in the etiology and maintenance of anxiety …

The opioid system plays a crucial role in the neural modulation of anxiety. The involvement
of opioid ligands and receptors in physiological and dysfunctional forms of anxiety is …

When environmental cues or stimuli that represent both rewarding and aversive outcomes
are presented, complex computations must be made in order to determine whether …

The drive to approach and explore novel conspecifics is inherent to social animals and may
promote optimal social functioning. Juvenile animals seek out interactions with novel peers …

Withdrawal from chronic opiates is associated with an increase in anxiogenic-like
behaviours, but the anxiety profile in the morphine-dependent animals is not clear. Thus …