Studies have been performed on undiagnosed individuals and they have shown that minor detail alterations can and do easily go unnoticed. In a specific study, individuals were asked to watch a tape of a robbery and then recall details about it. A week later they were brought back in and read over a supposed copy of their written statement. However, this statement included minor alterations such as the number of people in the store at the time or what type of headgear the thief was wearing. Sometimes this individuals would notice the alterations, but other details went unnoticed, suggesting that undiagnosed individuals have a level of memory distrust. Details had been altered that were accepted as truth, regardless of what actual memory the individual could recall.