Chapter 1 establishes the foundational concepts of neuroimaging by exploring the complex relationship between brain structure and mental function. It traces the historical progression from ancient surgical approaches to modern noninvasive techniques, contextualizing how technological innovations have transformed our understanding of neural processes. The chapter examines the multiscale nature of brain investigation, from single-neuron recordings to population-level measurements, and evaluates the critical tradeoffs between spatial and temporal resolution across imaging modalities. Key neurophysiological principles underlying these technologies are introduced, including neuronal action potentials, hemodynamic responses, and the chemical processes that support neural activity. The text challenges common neuromyths while addressing fundamental questions about functional organization, from modular specialization to distributed network processing. By comparing the relative strengths and limitations of major neuroimaging tools (fMRI, EEG, MEG, PET, and TMS), the chapter provides an analytical framework for understanding how these methodologies collectively advance our ability to correlate brain activity with cognitive and behavioral processes, setting the stage for more detailed exploration in subsequent chapters.