Work

Ventral tegmental area circuits in defensive states: Emerging mechanisms of fear and anxiety

Year: 2026

Type: review

Abstract: The ventral tegmental area (VTA) has traditionally been framed as a hub for motivation and positive reinforcement learning. However, growing evidence reveals that the VTA is also deeply embedded in defensive computations. Across glutamatergic, GABAergic, and dopaminergic populations, VTA neurons respond to aversive stimuli and can initiate innate defensive behaviors when manipulated. Here, we synthesize recent advances showing that VTA circuits detect threats, encode aversive salience, and orchestrate responses ranging from freezing and risk assessment to escape and defensive aggression. By integrating findings across cell types and circuits, we propose that the VTA functions as a dynamic threat-computation hub that maps threat imminence onto adaptive action policies. Stress-induced plasticity within VTA microcircuits may recalibrate defensive thresholds, offering a mechanistic bridge to anxiety disorders.

Source: Trends in Neurosciences

DOI: 10.1016/j.tins.2026.06.008

Authors: Joana Gomes-Ribeiro, Jacques Barik, Sebastian P. Fernandez

Institutions: Centre National de la Recherche Scientifique, Inserm, Université Côte d'Azur, Institut de Pharmacologie Moléculaire et Cellulaire

Language: English

Topic: Neurotransmitter Receptor Influence on Behavior

Subfield: Cellular and Molecular Neuroscience

Field: Neuroscience

Domain: Life Sciences

SDG: Good health and well-being

Open Access status: hybrid

Estimated APC paid: $7,030