Psychological Analysis of Reports of Unidentified Aerial Objects

This memorandum report, dated April 28, 1949, from the Engineering Division of the Air Materiel Command, provides a psychological analysis of 212 reports of unidentified aerial objects. The authors, led by Paul M. Fitts of the Aero Medical Laboratory, argue that human perception is inherently fallible, particularly when observers lack familiar reference points to judge the speed, distance, or size of objects in the sky. The report asserts that most sightings can be explained as misinterpretations of conventional objects, such as weather balloons, aircraft, or birds, or as the result of psychological factors like mass hysteria, vertigo, or the tendency of individuals to see what they expect to see. The document details several specific incidents, including sightings at Hickam Field, Van Nuys, and Lockbourne Air Force Base, to illustrate how observers often misjudge the nature and behavior of objects. The authors conclude that there is no direct threat to national security from these objects and recommend that future investigations focus on obtaining more precise data, such as angular positions and visual angles, rather than relying on subjective estimates. The report also highlights the potential for sensationalized media coverage to influence public perception and lead to further inaccurate reports. It emphasizes that the inability to identify objects is often due to the lack of a known stimulus, and that once an object is identified, observers can estimate its characteristics with greater accuracy. The document serves as a foundational psychological assessment within the Project Blue Book series, aiming to standardize the evaluation of sighting reports by applying scientific principles of human observation.