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Jin, In-Beom; Kim, Nam-Heon; Han, Jung-Soo
Behavioral neuroscience, 06/2024, Volume: 138, Issue: 3Journal Article
Associating a neutral conditioned stimulus (CS) with the absence of a biologically significant unconditioned stimulus (US) confers conditioned inhibitory properties upon the CS, referred to as conditioned inhibition. Conditioned inhibition and conditioned excitation, an association of a CS with the presence of the US, are fundamental components of associative learning. While the neural substrates of conditioned excitation are well established, those of conditioned inhibition remain poorly understood. Recent research has shed light on the lateral habenula (LHb) engagement in conditioned inhibition, along with the midbrain dopaminergic neurons. This article reviews behavioral tasks conducted to assess conditioned inhibition and how experimental LHb manipulations affect performance in these tasks. These results underscore the critical role of the LHb in conditioned inhibition. Intriguingly, stress increases LHb reactivity and impairs performances in tasks consisting of a component of conditioned inhibition in animals. Dysfunction of the LHb is observed in patients with depression. The ability of an organism to perform conditioned inhibition is closely linked to altered neuronal activity in the LHb, which has implications for mental disorders. (PsycInfo Database Record (c) 2024 APA, all rights reserved).
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