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Articles, Behavioral/Cognitive

Consolidation of Complex Events via Reinstatement in Posterior Cingulate Cortex

Chris M. Bird, James L. Keidel, Leslie P. Ing, Aidan J. Horner and Neil Burgess
Journal of Neuroscience 28 October 2015, 35 (43) 14426-14434; DOI: https://doi.org/10.1523/JNEUROSCI.1774-15.2015
Chris M. Bird
1School of Psychology, University of Sussex, Falmer BN1 9QH, United Kingdom,
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James L. Keidel
1School of Psychology, University of Sussex, Falmer BN1 9QH, United Kingdom,
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Leslie P. Ing
2UCL Institute of Cognitive Neuroscience, University College London, London WC1N 3AR, United Kingdom,
3King's College Hospital, Denmark Hill, London SE5 9RS, United Kingdom, and
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Aidan J. Horner
2UCL Institute of Cognitive Neuroscience, University College London, London WC1N 3AR, United Kingdom,
4UCL Institute of Neurology, London WC1N 3BG, United Kingdom
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Neil Burgess
2UCL Institute of Cognitive Neuroscience, University College London, London WC1N 3AR, United Kingdom,
4UCL Institute of Neurology, London WC1N 3BG, United Kingdom
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  • Figure 1.
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    Figure 1.

    A, Study design for Experiment 1. All 21 videos were watched consecutively on day 1, and the videos from Conditions 1 and 2 were rehearsed/recalled (i.e., described aloud in response to the video title), with the experimenter present, after a break of 5 min. Videos from Conditions 2 and 3 were rehearsed/recalled on day 8. All 21 videos were recalled on day 18. B, Study design for Experiment 2. On day 1, 26 videos were watched, and 20 of these were silently rehearsed in an MRI scanner. The watching and rehearsal periods were divided into two runs. A week later, all 26 videos were recalled in the presence of an experimenter. C, Procedure for Experiment 2. Each video was shown with its title present. The videos were cued using their title in the rehearsal period, and this period was terminated by the participant and followed by a vividness rating. Used with permission from the group.

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    Figure 2.

    Behavioral results from Experiment 1. Videos that were recalled on days 1, 8, and 18 (Set 1) were recalled best, with only 4.5% of the details forgotten between day 1 and day 8 and a 2% improvement in recall on day 18. Videos that were recalled on day 1 and day 18 (Set 2) were also remembered reasonably well, with only 14.7% of the details forgotten by day 18. By contrast, videos that were not recalled on day 1 but were first recalled on day 8 (Set 3) showed substantial forgetting, with the number of details recalled being 47.8% lower than the level of recall on day 1 on Sets 1 and 2. Performance on Set 3 improved by 7.6% between day 8 and day 18. Error bars indicate SEM.

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    Figure 3.

    Brain regions involved in memory encoding compared with rest periods. Orange regions were more active when encoding videos. Blue regions were deactivated during encoding periods compared with rest. Increased opacity of the color corresponds to higher t values. Regions significant at p < 0.001 (uncorrected for multiple comparisons) are outlined in black.

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    Figure 4.

    Brain regions involved in memory rehearsal compared with rest periods. Orange regions were more active when rehearsing the videos. Blue regions were deactivated during rehearsal periods compared with rest. Increased opacity of the color corresponds to higher t values. Regions significant at p < 0.001 (uncorrected for multiple comparisons) are outlined in black.

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    Figure 5.

    Brain regions involved in memory reinstatement. Heatmap shows regions where the pattern of BOLD signal when encoding the videos is correlated with BOLD signal when rehearsing the corresponding videos (compared with rehearsing noncorresponding videos). The map is thresholded at p < 0.001 (whole-brain family-wise error corrected for cluster size).

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    Figure 6.

    Region where the strength of reinstatement is associated with the amount recalled 1 week later. In the posterior cingulate cortex, the strength of correlation between the pattern of activity during encoding and rehearsal of matched video clips was associated with the number of details recalled on day 7. The map is thresholded at p < 0.001 (whole-brain family-wise error corrected for cluster size).

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    Table 1.

    Brain regions showing RSA for encoding and retrievala

    RegionSize (voxels)Peak xPeak yPeak zt-statistic
    RSA between encoding and rehearsal of the same video
        Bilateral precuneus/posterior cingulate cortex4579−3−55209.2
        Left middle temporal gyrus/parahippocampal gyrus/inferior parietal lobule/hippocampus/superior temporal sulcus3747−45−5988.86
        Right superior temporal gyrus/angular gyrus/inferior parietal lobule360645−532012.33
        Right parahippocampal gyrus75735−39−67.34
        Right insula/middle frontal gyrus/white matter304399185.96
    Modulation of regions showing RSA between encoding and rehearsal by the number of details subsequently recalled
        Bilateral posterior cingulate cortex/precuneus224−3−41325.72
    • ↵aAll clusters are significant when whole-brain family-wise error was corrected for cluster size.

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The Journal of Neuroscience: 35 (43)
Journal of Neuroscience
Vol. 35, Issue 43
28 Oct 2015
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Consolidation of Complex Events via Reinstatement in Posterior Cingulate Cortex
Chris M. Bird, James L. Keidel, Leslie P. Ing, Aidan J. Horner, Neil Burgess
Journal of Neuroscience 28 October 2015, 35 (43) 14426-14434; DOI: 10.1523/JNEUROSCI.1774-15.2015

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Consolidation of Complex Events via Reinstatement in Posterior Cingulate Cortex
Chris M. Bird, James L. Keidel, Leslie P. Ing, Aidan J. Horner, Neil Burgess
Journal of Neuroscience 28 October 2015, 35 (43) 14426-14434; DOI: 10.1523/JNEUROSCI.1774-15.2015
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Keywords

  • episodic memory
  • fMRI
  • hippocampus
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