In this article, we aim to describe the crucial role of the somatic marker hypothesis (SMH) in the interaction between what we term the ‘emotional imperative’ and the interference of reason during the decision-making process in António Damásio’s work Descartes’ Error: Emotion, Reason, and the Human Brain. Firstly, we examine the interaction between reasoning, emotions, and human action, with emphasis on the cognitive processes underlying decisionmaking. Next, we explore the influence of emotional and biological factors on SMH, going beyond cost-benefit (...) analysis, highlighting the relevance of memory and mental representations in the decision-making process. Subsequently, we address the influence of SMH, emotions, and feelings on decisions, especially in scenarios of risk and immediate reward, emphasizing the need to consider immediate and future implications. Following this, we investigate somatic markers in neural terms, discussing whether they are innate or acquired and their influence on social behavior and brain lesions. Finally, we analyze the relationship between brain processes, such as the prefrontal cortices, and the interpretation of bodily sensations, emotional responses, and decisionmaking, accentuating the importance of these regions in assimilating somatic markers and their influence on thoughts, perceptions, and behaviors. We conclude that SMH is seen as a biological mechanism that integrates emotional and cognitive information, shaping evaluations and choices. -/- . (shrink)