![]() Participants were more likely to base their decision about whether to keep or trash an image on how they felt about a memory rather than its objective accuracy. But, people were more likely to claim that they remembered vividly when looking at pairs of dissimilar images. The results showed higher levels of objective memory when participants were tested with pairs of similar images. The team also used functional MRI to measure brain activity during this task. Finally, participants were asked to select which images to keep or discard, assigning them to a treasure chest or trash bin. This experimental design allowed the researchers to score objective memory by how well the volunteers recalled previously seeing an image, and subjective memory by how they rated their own memory as vividly recollected or merely familiar. For example, a chair might be shown with another chair shown from a different angle, or with an apple. In others, the target was shown with an unrelated image from the same original set. In some of the tests, image pairs included a target image and a similar image of the same object. The volunteers were asked to rate the memory as "recollected," if they experienced it as vivid and detailed, or as "familiar" if they felt that the memory lacked detail. After showing volunteers a series of images of common objects, the researchers showed them pairs of images and asked them to determine which of the two they had seen before. ![]() Postdoctoral researcher Yana Fandakova, now an investigator at the Max Planck Institute for Human Development in Berlin, graduate student Elliott Johnson and Ghetti tested objective and subjective memory. The work is published March 9 in the journal eLife. "The study distinguishes between how well we remember and how well we think we remember, and shows that decision making depends primarily on the subjective evaluation of memory evidence," said co-author Simona Ghetti, professor at the UC Davis Department of Psychology and Center for Mind and Brain.
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