Köhler argued against the idea that direct experience was not measurable or usable. Drawing upon his personal experience and interest in the field of physics, Köhler posed the example of two physicists observing a galvanometer (an instrument that detects and measures electric current) and making inferences based on the information it provides. According to Köhler, behaviourists act in a similar way when observing behaviours. One behaviourist will observe a behaviour and share results, leading to an extension of these findings by others in the field. While behaviourism denies direct experience, Köhler suggests that behaviourists are unknowingly accepting it in this regard. Just as the galvanometer is independent of the physicist, so is the subject from the behaviourist. Direct experience results in the observation of phenomena and leads to results. In this regard, he felt that the standpoint of the behaviourists appears somewhat paradoxical.