ROSANNA OLSEN, Rotman Research Institute
Title: The Relationship Between Eye Movements and Subsequent Recognition: Evidence from Aging an Amnesia
Ebbinghaus Empire Series 2015-2016
VIDEO RECORDING OF TALK
Abstract: It is well established that image viewing changes as a function of repetition--that is, the number of fixations directed toward a novel image is higher than the number of fixations made to subsequent presentations of that image. However, questions remain regarding the nature of the memory representations and the corresponding neural regions which drive these eye movement repetition effects. We examined the relationship between eye movement repetition effects for faces and subsequent recognition memory in three groups: younger adults, older adults, and two young adults with developmental amnesia. All three groups demonstrated eye movement repetition effects for repeated faces; however, recognition memory for studied faces was reduced in older adults and for the developmental amnesia cases compared to younger adults. A neuroimaging study was next conducted in which eye movements were recorded during fMRI scanning of healthy young adults while they viewed novel and repeated faces. Analyses identified brain areas in which the magnitude of the eye movement repetition effect was correlated with the magnitude of the neural repetition effect across subjects. Brain regions which exhibited a significant correlation were located in regions which have previously been related to face processing within the ventral visual processing stream. Taken together, these results indicate that eye movement repetition effects are driven by memory representations that are not necessarily available for conscious access and that this type of eye movement repetition effect is associated with neural changes in extra-hippocampal neocortical regions.
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