This document provides an overview of the key concepts covered in Unit 1 of the Psychophysics course, including: - The importance of psychophysics in mapping the relationship between physical stimuli and psychological responses to understand sensory function. - Key concepts like absolute and differential thresholds that measure detection and discrimination abilities. - Psychophysical methods used to study these relationships quantitatively, allowing comparison across research areas like neuroscience. - Theories like Signal Detection that help explain sensory and perceptual processes.