Scott Alexander explores why medical residency test scores plateau after the first few years, proposing theories related to knowledge retention and individual differences in learning. Longer summary

The post discusses the plateau in standardized test scores for medical residents across different specialties. Scott Alexander analyzes data from internal medicine, psychiatry, and surgery residencies, noting that while scores improve significantly in the first year or two, they tend to level off in later years. He explores various potential explanations for this plateau, including ceiling effects, decreased motivation, and changes in teaching methods, but finds these unsatisfactory. The author proposes that the plateau might be related to how knowledge is reinforced and retained, drawing parallels to spaced repetition learning techniques. He suggests that individual differences in memory, intellectual curiosity, and integration of knowledge may contribute to the differences in scores among residents at the same level. The post concludes by considering the implications of this plateau effect for understanding learning and education more broadly. Shorter summary