Laboratory was related to Külpe’s beliefs in philosophical realism. The work focused on the idea of imageless thought, which is the belief that there is an objective significance that can be found within experiences that are not necessarily associated with specific words, symbols or signs. Külpe anticipated the notion of imageless thought in his early work as evidenced in Grundriss der Psychologie. He used an experiment to demonstrate that our ability to recognize something one has seen before is unrelated to whether or not we can remember an image of it. In his demonstrative experiment he took participants into a darkened room and asked them to visualize colors as he called them out. In all situations but one participants were able to visualize the colors. The participant that was unable to visualize the colors had no cognitive deficits, which lead Külpe to his conclusion that recognition is independent of remembrance Külpe believed that the research on thought processes up to that point, including Wundt’s study on the associations between thoughts and images, had been incomplete. Influenced by his interest in philosophy, Külpe believed that there were certain sensations, feelings, or presentations that could neither be described nor associated in the mind with an image. Once they were given the opportunity to objectively self-observe and describe what was neither sensation, feeling, nor presentation, yet was still a thought process Külpe and his colleagues identified the need for new definitions and concepts aside from those that already exist. For example, Külpe and his students, A.M. Mayer and J. Orth identified that following the presentation of the stimulus word “meter”, an indescribable conscious process occurred that led to the subject responding with the word “trochee”. This, they proposed, indicated that Wundt was wrong in his belief that all events in the thought process have either associated or direct images. Their research, although imperfect, using the systematic experimental introspection methods that Külpe and the students had developed and refined, established a foundation for imageless thought research that is still relevant and debated within the field of psychology today. Abstraction and attention In the early 1900s Külpe performed experiments on the concept of abstraction at the Würzburg School. Külpe defined abstraction as a process in which one focuses on certain aspects of reality while ignoring others. In one famous experiment Külpe instructed participants to observe a display of numbers, letters, colors, and shapes. For example,