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

by George Stuart Fullerton

"On Sameness and Identity: A Psychological Study" by George Stuart Fullerton is a scientific publication written in the late 19th century. The book explores the intricate concepts of sameness and identity in relation to psychological theory, examining the ambiguity of the word "same" and how different experiences can mistakenly be interpreted as identical. Fullerton aims to clarify these distinctions and the implications of misinterpretation on understanding knowledge and perception. The opening of the text lays the groundwork for this exploration by addressing the various meanings associated with sameness. Fullerton begins with a discussion on the ambiguity of the term "same," indicating that its common usage obscures essential distinctions that have significant implications. He categorizes the types of sameness into several sections, ranging from the identity of a sensation at a given moment to the perception of the same object over time. His methodical approach intends to untangle the complexities surrounding identity in perception and thought, setting the stage for deeper philosophical inquiries into the foundation of knowledge.