"Diagnosis" by R. A. Palmer is a science fiction short story published in the early 1950s. The narrative revolves around experimentation with the human brain, specifically focusing on the psychological and emotional states of individuals, conducted through innovative technological means. The story intertwines elements of romance, adventure, and tension, suggesting deep explorations into the subconscious mind and its effects. The plot centers on two primary characters: Don Jensen and Mary Mason, who work together in a laboratory conducting experiments on brainwave patterns using an oscilloscope. As they explore the functions of the pineal gland, their scientific endeavor leads to unexpected adventures, revealing deeper feelings between them. During an experiment, Mary inadvertently taps into Don's subconscious thoughts, projecting images from his mind onto a screen that includes a thrilling narrative involving her, an ancient temple, a monstrous beast, and a love story that unfolds in the backdrop of danger and intrigue. Through the process, the two confront their own emotions and motivations, leading to a blend of humor, romance, and revelation about their true feelings for each other. (This is an automatically generated summary.)