Structuralism, an early psychological theory developed by Wilhelm Wundt and his student Edward Bradford Titchener, sought to dissect the human mind into its most fundamental components. Wundt's groundbreaking work in his laboratory set the stage for Titchener to define structuralism's goal as cataloging the "atoms" of the mind—sensations, images, and feelings—akin to how chemists identify elements of matter.

Titchener's approach to structuralism was unique. He employed introspection, a method where subjects analyzed and reported their own conscious experiences in response to stimuli to map out the structures of the mind. This method was akin to understanding a machine by examining each component, such as the gears and springs in a clock. The aim was to comprehend mental processes by breaking them down into their simplest parts.

Yet, the structuralist approach had its challenges. The primary drawback was the reliance on introspection, a subjective method in which subjects analyzed and reported their own conscious experiences in response to stimuli. This method needed to have the reliability of more objective measurements, which was underscored by Oswald Kulpe's concept of imageless thought. This concept revealed that not all cognitive processes have a sensory or emotional component, casting doubt on the idea that introspection could capture the entirety of mental life.

Despite its limitations and the eventual shift towards functionalism, which examined the purpose of mental processes, structuralism's emphasis on systematic observation and analysis was a crucial milestone in the scientific study of the mind. It not only underscored the importance of empirical evidence but also laid the foundation for the diverse exploration of psychology that continues to this day.