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  2. Fear processing in the brain - Wikipedia

    en.wikipedia.org/wiki/Fear_processing_in_the_brain

    Neuronal fear pathways [ edit ] In fear conditioning, the main circuits that are involved are the sensory areas that process the conditioned and unconditioned stimuli, certain regions of the amygdala that undergo plasticity (or long-term potentiation) during learning, and the regions that bear an effect on the expression of specific conditioned ...

  3. Epigenetics of anxiety and stress–related disorders - Wikipedia

    en.wikipedia.org/wiki/Epigenetics_of_anxiety_and...

    The HDACi drug, d-cycloserine, was found to reduce fear in 129S1/SvImJ mice, which are mice that show poor extinction acquisition and recovery of fear-induced suppression of heart-rate variability, enlarged dendritic arbors in basolateral amygdala neurons, and functional abnormalities in cortico-amygdala circuitry that mediates fear extinction ...

  4. Papez circuit - Wikipedia

    en.wikipedia.org/wiki/Papez_circuit

    A heuristic model of the neural pathway of the Papez circuit shows the connections between its different parts. Based on Papez's experiment with aggression in rats and other studies, it was initially believed that the circuit was involved with emotion. The circuit connects the hypothalamus and the cortex and acts as the emotional system of the ...

  5. Fear conditioning - Wikipedia

    en.wikipedia.org/wiki/Fear_conditioning

    Pavlovian fear conditioning is a behavioral paradigm in which organisms learn to predict aversive events. [1] It is a form of learning in which an aversive stimulus (e.g. an electrical shock) is associated with a particular neutral context (e.g., a room) or neutral stimulus (e.g., a tone), resulting in the expression of fear responses to the originally neutral stimulus or context.

  6. Epigenetics of depression - Wikipedia

    en.wikipedia.org/wiki/Epigenetics_of_depression

    Epigenetics of depression is the study of how epigenetics (heritable characteristics that do not involve changes in DNA sequence) contribute to depression. Major depressive disorder is heavily influenced by environmental and genetic factors.

  7. Biology of depression - Wikipedia

    en.wikipedia.org/wiki/Biology_of_depression

    While depression severity as a whole is not correlated with a blunted neural response to reward, anhedonia is directly correlated to reduced activity in the reward system. [79] The study of reward in depression is limited by heterogeneity in the definition and conceptualizations of reward and anhedonia.

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