On Sameness and Identity: A Psychological Study Being a Contribution to the Foundations of a Theory of Knowledge

This work launches a meticulous inquiry into the everyday word “same,” revealing how its hidden nuances have tangled everyday thought and scientific reasoning. By teasing apart subtle variations in meaning, the author shows why precision matters—especially when the concepts of identity and contradiction hinge on it. Readers are invited into a scholarly conversation that balances rigorous analysis with an approachable, almost conversational tone.

The text outlines three distinct flavors of sameness: the immediate self‑identity of a sensation at a single moment; the resemblance of mental states across time, such as feeling a pain today that echoes one from yesterday; and the perception of an unchanged external object when viewed at different moments. Drawing on experiments in experimental psychology and classic philosophical insights, the discussion illuminates how our minds construct continuity and how those constructions shape our understanding of knowledge itself. The result is a thought‑provoking guide that challenges listeners to rethink a word they use without ever noticing.