James B. Brewer, Zuo Zhao, John E. Desmond, Gary H. Glover, John D. E. Gabrieli M AKING M EMORIES : B RAIN A CTIVITY THAT P REDICTS H OW W ELL V ISUAL.

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Presentation transcript:

James B. Brewer, Zuo Zhao, John E. Desmond, Gary H. Glover, John D. E. Gabrieli M AKING M EMORIES : B RAIN A CTIVITY THAT P REDICTS H OW W ELL V ISUAL E XPERIENCE W ILL B E R EMEMBERED Presented by: David Wu

B ACKGROUND I NFORMATION  Most important regions for declarative memory: parahippocampal cortex and some regions of frontal cortex  Traditionally fMRI studies used block designs with novel versus repeated scenes to determine which brain areas encode declarative memory  Confounds: could be a response to novelty and not encoding, or could reflect habituation, reduced attention or strategic differences because activation is averaged over long predictable blocks  This study attempts to resolve these confound by using a event-related design, where separate activations are recorded for each stimulus

D ESIGN  6 right-handed subjects (3F, 3M, aged 22-32)  4 fMRI scans consisting of 24 pictures of indoor and outdoor scenes  30 minutes later, given an unexpected memory test which consisted of all the previously seen pictures and 32 new pictures  Judge whether each picture was clearly remembered, familiar, or forgotten

R ESULTS  7 regions where activity level predicted whether pictures would be remembered, familiar or forgotten  1 was in the right inferior frontal sulcal region of the dorsolateral prefrontal cortex  6 were in bilateral parahippocampal cortex  Activations greater for remembered compared with familiar (t(5)=3.55, P<0.05)  And for familiar than forgotten (t(5)=4.56, P<0.01)

R ESULTS Displays voxels with significant positive correlations between event- related activations to pictures and subsequent memory for those pictures. Right dorsolateral prefrontal cortex (upper right slice 1) Bilateral parahippocampal cortex (all other regions)

R ESULTS Examples of average signal intensity in each region Graph D shows mean voxel response in parahippocampal areas showing significant correlation with subsequent memory in each subject

D ISCUSSION  The activated prefrontal area is related to spatial working memory tasks  Memory for scenes determined by spatial working memory processes in the right prefrontal area, and long-term memory processes in the bilateral parahippocampal areas  Has been proposed two regions constitute a neural circuit that mediates the formation of spatial long-term memories

M Y O PINION  Strengths:  Simple and effective design that produced unambiguous results  Concise paper that was very easy to read  Limitations  Did not image the entire brain, there could be other activation areas that were not found  Small sample size  Future Direction: Do different areas predict how well you will remember words, objects or faces?

B IBLIOGRAPHY  Brewer J. B., Zhao Z., Desmond J. E., Glover G. H., Gabrieli J. D. E. (1998). Making Memories: Brain Activity that Predicts How Well Visual Experience Will Be Remembered. Science, 281(5380):