Mnemonic representations of transient stimuli and temporal sequences in the rodent hippocampus in vitro

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1 Supplementary Material Mnemonic representations of transient stimuli and temporal sequences in the rodent hippocampus in vitro Robert. Hyde and en W. Strowbridge Mossy ell 1 Mossy ell Mossy ell 3 Stimulus Identity D ms Supplemental Figure 1 Example of synaptic barrages evoked by different stimulus locations. Raster plots of EPSP onset times recorded in three hilar cells simultaneously ( s window beginning. s after the last stimulus). Responses from different cells identified by color. Three consecutive trials from each stimulus location presented in each box. Each row represents responses to a different stimulus location. Stimulus trials were evoked in pseudorandom order but displayed together for clarity. * Num Planes (out of ) 3 1 (n = 11 expts) Window Duration (sec) Supplemental Figure Response classification as a function of analysis window duration. Plot of the number of statistically significant LD planes (P <.) versus window duration for - site location stimulation experiments (n = 1; possible planes). ll EPSP frequency analysis windows began at the same time point (. s following the last PP stimulation). * P <. (t-test). (No other comparisons with the number of planes generated using s duration windows were statistically significant.) Nature Neuroscience: doi:1.138/nn.38

2 Prob is Overlap rea Trans Distance (Hz) ell EPSP is Trans. ell 1 EPSP d cis d trans. Probability Density.1.1 OVL= EPSP Probability * p(ovl <.8) = OVL of shuffled samples Supplemental Figure 3 omputing the OVL statistic., Schematic of overlap method. Red indicates cis distances computed from Euclidean distances between individual responses and the mean response of that stimulus type. lue indicates trans distances from individual responses to each dissimilar mean response., Example of overlap analysis in one experiment showing the distribution of cis (n=19) and trans (n=7) distances. Solid lines indicate Gaussian fits to each distribution (cis mean =. Hz; trans mean = 7.1 Hz). Overlap coefficient calculated from probability density distribution overlap (OVL =.8 in this experiment). ll distances computed from mean EPSP frequencies in s window beginning. s after the last stimuli., Probability distribution obtained by shuffling distance labels (cis or trans), times. In this experiment, the probability of obtaining the observed overlap coefficient by chance was <.1. Statistical significance was considered at the 9% confidence interval. Nature Neuroscience: doi:1.138/nn.38

3 Stimulus Time (sec) Stimulus Time (sec) Stimulus Time (sec) Stimulus x Time (sec) (n = 9 expts) Stimulus y Time (sec) On-Diagonal (same time comparisons). D Prob Density Prob Density (n = 1) 8 1 Off-Diagonal (different time comparisons) E umulative Frequency On-Diagonal Off-Diagonal (K-S statistic =.18) 8 1 (n = 188) 8 1 Supplemental Figure lassification accuracy across different times., Example displays of pairwise classification accuracies in two experiments (both stim vs comparisons). ll accuracies were computed pairwise using linear discriminant analysis., Summary display for all pairwise comparisons ( vs, vs, etc) from 9 triple recording experiments. The same color map for pairwise accuracy, shown on right, was used for displays in panels and. lack rectangles represent same-time comparisons; off-diagonal values represent comparisons across different times (e.g., sec in Stim vs 1 sec in Stim ). ll accuracy matrices were computed using s analysis windows starting at the times indicated on the X and Y axes., Histogram of all same-time pairwise discrimination accuracies in 9 triple recording experiments. D, Histogram of across-time discrimination accuracies in the same 9 experiments plotted in. E, Plots of cumulative distributions of the same-time and across-time discrimination accuracies. The two cumulative distributions are not statistically different (two-sample Kolmogorov-Smirnov test statistic =.18; P >.7). Nature Neuroscience: doi:1.138/nn.38

4 ll Episodes D 3s Stim Supplemental Figure Visual display of short-term information storage in the dentate gyrus. Graphical representation of hilar population response to repeated trials of four different stimulus sites (indicated on left; data acquired in pseudorandom order and then re-arranged to cluster each stimulus type). haracter intensity inversely related to distance to centroids for each stimulus. See Online Methods for details. Nature Neuroscience: doi:1.138/nn.38

5 Example #1 - D vs D ( sec) Example #1 - D vs D ( sec) 1 1 in D 8 in D in D 8 in D Example # - D vs D ( sec) Example # - D vs D ( sec) 3 3 in D 1 1 in D 1 1 in D 1 1 in D Example #1 - D vs D (1 sec) Example #1 - D vs D (1 sec) in D in D 1 in D in D Example # - D vs D (1 sec) Example # - D vs D (1 sec) in D in D 3 in D in D Supplemental Figure omparison of responses to the same stimulus presented in different sequences., Examples of vector responses to stimulus (left plots) and (right plots) presented within forward and reverse s sequences., Examples of vector responses to and stimuli presented within 1 s forward and reverse sequences. ll vectors plotted in panels and were computed from average responses to forward and reverse sequence trials and displayed from the same origin. Nature Neuroscience: doi:1.138/nn.38

6 3 D D - Supplemental Figure 7 Distinct representations of forward and reverse sequences with 8 s intervals. Plot of individual responses to forward (n = trials) and reverse (n = 7 trials) sequential stimuli (8 s intervals) plotted in 3-dimensional EPSP frequency space. ll points contained within bounding ellipsoids (8% confidence intervals) centered on response centroids. Forward and reverse responses were statistically separable in this - experiment (P < x 1 ; t-test). 3 ( sec) Sequence vs Isolated Response Distance (Hz) 1 1 ( sec) (8 sec) (1 sec) ( sec MK-81) Forward vs Reverse Sequence Distance (Hz) Supplemental Figure 8 Plot of context dependence of responses to sequential stimuli. Summary plot of results from sequential stimulation experiments grouped by sequence interval. verage separation between forward and reverse sequences plotted along X axis (D vs D); average distance between sequence response and response to the last stimulus within the sequence when presented in isolation plotted along Y axis (D vs D; vs D). Data plotted as mean ± SEM. Red symbol represents s interval sequence experiments in which NMD receptors were blocked using 1 µm MK-81. Nature Neuroscience: doi:1.138/nn.38

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