a flicker change detection task reveals object-in-scene memory across species

Clicks: 347
ID: 133322
2011
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Abstract
Tests of recognition memory in macaques typically assay memory for objects or isolated images, over time spans of seconds to hours from stimulus presentation, and/or require extensive training. Here, we propose a new application of the flicker change detection task that could measure object-in-scene memory days after single-trial exposures. In three experiments, participants searched for a changing object - or ‘target’ - embedded within a scene as their eye movements were tracked. For new targets-in-scenes, the change is difficult to detect and requires extensive search. Once the target is found, however, the change becomes obvious. We reasoned that the decreased times required to find a target in a repeated scene would indicate memory for the target. In humans, targets were found faster when the targets and scenes were explicitly remembered than when they were forgotten, or had never been seen before. This led to faster repeated-trial compared to novel-trial search times. Based solely on repeated-trial search times, we were able to select distributions comprised of predominantly remembered or predominantly forgotten trials. Macaques exhibited the same repetition effects as humans, suggesting that remembered trials could be dissociated from novel or forgotten trials using the same procedures we established in humans. Finally, an anterograde amnesic patient with damage that included the medial temporal lobe showed no search time differences, suggesting that memory revealed through search times on this task requires medial temporal lobe integrity. Together, these findings indicate that the time required to locate a changing object reveals object-in-scene memory over long retention intervals in humans and macaques.
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chau2011frontiersa Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Vivian L. Chau;Emily F. Murphy;R. Shayna eRosenbaum;R. Shayna eRosenbaum;R. Shayna eRosenbaum;Jennifer D Ryan;Jennifer D Ryan;Kari L Hoffman
Journal lasers in manufacturing and materials processing
Year 2011
DOI
10.3389/fnbeh.2011.00058
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