This lecture explores the importance of motivation in learning, distinguishing between intrinsic and extrinsic motivation. It delves into the concept of interest as a dynamic feature of interaction, emphasizing the role of effort in the acquisition of knowledge. The instructor discusses how our brain tends to conserve energy, favoring automatic processes over analytical thinking. The presentation highlights the impact of interest on learning outcomes, drawing on studies that demonstrate how interest is influenced by factors such as relevance, novelty, and cognitive engagement.