The concept of regression is considered with an emphasis on the differences between the positions of Freud and Jung regarding its significance. The paper discusses the results of experimental analyses of individual experience dynamics (from gene expression changes and impulse neuronal activity in animals to prosocial behaviour in healthy humans at different ages, and humans in chronic pain) in those situations where regression occurs: stress, disease, learning, highly emotional states and alcohol intoxication. Common mechanisms of regression in all these situations are proposed. The mechanisms of regression can be described as reversible dedifferentiation, which is understood as a relative increase of the representation of low-differentiated (older) systems in the actualized experience. In all of the cases of dedifferentiation mentioned above, the complexity of the systemic organization of behaviour significantly decreases.

中文翻译：

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回归 I. 回归的实验方法

回归概念的考虑重点在于弗洛伊德和荣格关于其重要性的立场之间的差异。该论文讨论了个体经验动态（从动物的基因表达变化和冲动神经元活动到不同年龄的健康人类和处于慢性疼痛中的人类的亲社会行为）在发生回归的情况下的实验分析结果：压力、疾病、学习、高度情绪化和酒精中毒。提出了所有这些情况下的常见回归机制。回归机制可以被描述为可逆去分化，这被理解为在实际体验中低分化（旧）系统的表现相对增加。在上述所有去分化的情况下，