Abstract
Theta oscillation is considered a temporal scaffold for hippocampal computations that organizes the activity of spatially tuned cells known as place cells. Late phases of theta support prospective spatial representation via phase ‘precession’. In contrast, some studies have hypothesized that early phases of theta may subserve both retrospective spatial representation via phase ‘procession’ and the encoding of new associations. Here, combining virtual reality, electrophysiology and computational modeling, we provide experimental evidence for such a functionally multiplexed phase code and describe how distinct spatial inputs control its manifestation. Specifically, when rats continuously learned new associations between external landmark (allothetic) cues and self-motion (idiothetic) cues, phase ‘precession’ remained intact, allowing continuous prediction of future positions. Conversely, phase ‘procession’ was diminished, matching the putative role in encoding at the early theta phase. This multiplexed phase code may serve as a general circuit logic for alternating different computations at a sub-second scale.
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Preprocessed data used to perform the analyses and generate the figures in this paper are available via OSF at https://osf.io/nq65k/?. Source data are provided with this paper.
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Acknowledgements
We thank F. P. Battaglia for feedback on an earlier version of the paper, S. Zeger for statistical consultation and H. T. Blair and the members of the Cowan and Knierim laboratories for helpful comments. This research was supported in part by National Institutes of Health grants R01 NS102537 (J.J.K., N.J.C. and F.S.), R01 MH118926 (J.J.K. and N.J.C.) and R21 NS095075 (J.J.K. and N.J.C.); the Johns Hopkins Kavli Neuroscience Discovery Institute (M.S.M.); the Masason Foundation (Y.S.); the Ezoe Memorial Recruit Foundation (Y.S.); the Quad Fellowship (Y.S.); and the Honjo International Scholarship Foundation (Y.S.).
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R.P.J., M.S.M., F.S., N.J.C. and J.J.K. conceived of the study. All authors designed the analyses. Y.S. performed the formal analysis. Y.S. and J.J.K. wrote the paper, with input from all authors. N.J.C. and J.J.K. supervised the project.
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Extended data
Extended Data Fig. 1 Characterization of phase precession inside the Dome.
a, Example position–phase plots in landmark frame with different values of G. Red lines indicate the best-fit lines of the precession, computed using circular-linear regression. Place fields that contained double precessions are indicated by daggers and were excluded from further analyses. b, Comparison of precession statistics in epoch-based vs. lap-based fields. Epoch-based fields were defined from the tuning curve of the place cell during the entire epoch, while lap-based fields were defined as the range within the epoch-based field that the cell fired in a given lap. The lap-based field accounts for the lap-to-lap variability of the firing field locations111. This is especially important in this dataset, since the gain manipulation often caused a slight but continuous drift of the field locations throughout the session, making the epoch-based field larger than typical individual passes through the field. To test that our definition of lap-based fields produced a position–phase plot consistent with a more standard epoch-based field definition when fields did not have a biased drift, we compared the statistics of precession using data from epoch 1. Lap-based definition of place fields did not affect the correlational structure of phase coding but shallowed the slope estimate. Left, Precession slope. Best fit line: y = 0.622x + 6.33 (rho = 0.753, P = 1.00 ×10−16). Middle, Correlation coefficient. Best fit line: y = 0.919x - 0.0189 (rho = 0.935, P = 4.44 ×10−39). Right, Phase offset. Best fit line: y = 1.04x −26.5 (rho = 0.709, P = 8.64 ×10−9). Since the phase offset is a circular variable, the best fit line was found after wrapping around each lap-based phase offset such that the difference with its epoch-based counterpart was less than 180 degrees. Moreover, the correlation coefficient and the P value were computed using a circular-circular regression.
Extended Data Fig. 2 Scaling in the theta-modulated bursting frequency is accompanied by changes in other theta-modulated firing properties.
a–b, Change in NPR is predicted by the unit’s initial NPR. a, Histogram of the y-coordinate distance between each unit’s NPR in epoch 3 and the y = x line. A distance of 0 means that the unit scaled its theta-modulated firing frequency perfectly with gain. The units that formed fields in both epochs 1 and 3 were classified as having NPRs close to (distance < median) or further from (distance > median) the theoretical value. b, NPR of the two groups in epoch 1 (n = 33 units). Units that scaled their theta-modulated firing frequencies more faithfully in epoch 3 tended to have higher NPRs in epoch 1. β = 0.461, s.e. = 0.174, t(31) = 2.65, P = 0.0125; t-statistics/two-sided P value from the LMEM. Each violin plot shows the median (white circle), IQR (gray line), and distribution outline. c, Bursting rate was invariant to gain (n = 246 units). Overall: W(3) = 5.25, P = 0.154 (two-sided); Wald test on the LMEM. d, Theta-missing index was invariant to gain (n = 246 units). Overall: W(3) = 2.75, P = 0.432 (two-sided); Wald test on the LMEM. e–g, Quantification of theta-skipping24,58,59,60. e, Autocorrelogram (ACG) of an example unit without theta-skipping. f, Top, ACG of an example unit with theta-skipping. Note the disappearance of peak 1. Bottom, spiking of this unit relative to theta. g, Theta-skipping index was higher (less theta-skipping) in high gain condition compared to mid gain and G = 1 conditions (n = 242 units). Overall: W(3) = 14.6, P = 2.17 ×10−3 (two-sided); Epoch 1 vs. Low: β = −0.0808, s.e. = 0.0500, t(238) = −1.62, P = 0.107, Epoch 1 vs. Mid: β = −0.0438, s.e. = 0.0304, t(238) = −1.44, P = 0.150, Epoch 1 vs. High: β = −0.146, s.e. = 0.0408, t(238) = −3.59, P = 3.98 ×10−4, Low vs. Mid: β = 0.0370, s.e. = 0.0552, t(238) = 0.671, P = 0.503, Low vs. High: β = −0.0656, s.e. = 0.0601, t(238) = −1.09, P = 0.276, Mid vs. High: β = −0.103, s.e. = 0.0458, t(238) = −2.24, P = 0.0259; Wald test followed by t-statistics/two-sided P values from the LMEM. *: P < 0.05, ***: P < 0.001.
Extended Data Fig. 3 Quantification of theta phase coding in the absence of landmarks and under conditions of failure of landmark control.
a, Schematic of the hippocampal gain. When the pattern of place cell firing repeats every physical lap, the hippocampal map is locked to the lab frame (H = 1). Under gain manipulation, the same pattern repeats every n laps (n ≠ 1), which is defined as a hippocampal gain of 1/n. Reproduced from112. b, Example gain traces for epochs 1 through 4 and respective position–phase plots in epoch 4. The black (G) and blue (H) lines overlap during epochs 1–3, demonstrating the strong control of the hippocampal map by the landmarks. In epoch 4, the blue traces were maintained at values different from 1, demonstrating path integration gain recalibration47. c, Circular-linear correlation coefficients for epochs 1 and 4 (n = 233 units). β = 0.0148, s.e. = 0.0305, t(231) = 0.485, P = 0.628; t-statistics/two-sided p-value from the LMEM. Each violin plot shows the median (white circle), IQR (gray line), and distribution outline. d, Phase offsets for epochs 1 and 4 (n = 233 units). P = 0.556 (two-sided); hierarchical bootstrap test. e, Example gain traces of landmark failure (LMF) sessions and respective position–phase plots during LMF. The blue line (H) dissociated from the black line (G) during epochs 2 and 3. f, Example gain traces of an LMF session from individual place cells. The thick blue line (H) and the red lines (unit gains) overlap, demonstrating the coherence of the hippocampal map. g, Coherence error score of all place cells recorded during LMF as reported in Fig. 2g of47. The dashed line indicates a coherence error score of 0.1, analogous to the threshold defining landmark control. Most place cells (69/85) exhibited error scores < 0.1, indicating the coherence of the hippocampal population. Units with coherence error scores > 0.5 were grouped into a single bin. h, Circular-linear correlation coefficients for epoch 1 and LMF (n = 137 units). β = 0.0816, s.e. = 0.0397, t(135) = 2.05, P = 0.0419; t-statistic/two-sided P value from the LMEM. i, Phase offsets for epoch 1 and LMF (n = 137 units). P = 0.802 (two-sided); hierarchical bootstrap test. *: P < 0.05.
Extended Data Fig. 4 Quantification of single-traversal phase coding.
a, Distribution of single-traversal correlation coefficients. b, Distribution of single-traversal phase offsets. c, Constant precession can still be fit by a positive slope (red line). The blue-shaded region indicates one theta cycle, with a drop in firing rate in the middle of the field. d, Example single-traversal phase coding, fit with half-field slopes. e, Proportion of half-field slopes shows the nonmonotonic nature of many single-traversal phase coding. f, Proportion of positive half-field slopes. The second half of the field shows increased positive-slope traversals, suggestive of bona fide procession. χ2(1) = 91.97, P = 8.79 ×10−22; chi-squared test. g, Proportion of positive single-traversal slopes using traversals with strong firing (>= 25 spikes). Overall: χ2(3) = 29.13, P = 2.10 ×10−6; Epoch 1 vs. Low: χ2(1) = 18.64, P = 9.46 ×10−5, Epoch 1 vs. Mid: χ2(1) = 1.37, P = 0.242, Epoch 1 vs. High: χ2(1) = 13.66, P = 4.39 ×10−4, Low vs. Mid: χ2(1) = 15.45, P = 2.54 ×10−4, Low vs. High: χ2(1) = 2.13, P = 0.173, Mid vs. High: χ2(1) = 10.53, P = 1.76 ×10−3; chi-squared test followed by FDR correction. h, Proportion of positive single-traversal correlation coefficients. Overall: χ2(3) = 41.53, P = 5.05 ×10−9; Epoch 1 vs. Low: χ2(1) = 15.54, P = 1.61 ×10−4, Epoch 1 vs. Mid: χ2(1) = 2.53, P = 0.112, Epoch 1 vs. High: χ2(1) = 4.24, P = 0.0474, Low vs. Mid: χ2(1) = 26.90, P = 1.29 ×10−6, Low vs. High: χ2(1) = 8.77, P = 4.59 ×10−3, Mid vs. High: χ2(1) = 22.80, P = 5.40 ×10−6; chi-squared test followed by FDR correction. i, Phase offsets of single-traversal phase coding for each gain group. Epoch 1 vs. Low: k(1) = 3.09 ×104, P = 6.00 ×10−3, Epoch 1 vs. Mid: k(1) = 1.66 ×105, P = 1.50 ×10−3, Epoch 1 vs. High: k(1) = 9.12 ×104, P = 1, Low vs. Mid: k(1) = 1.04 ×105, P = 1.50 ×10−3, Low vs. High: k(1) = 7.56 ×104, P = 1.50 ×10−3, Mid vs. High: k(1) = 5.78 ×105, P = 1.50 ×10−3; two-sample Kuiper test (two-sided) followed by FDR correction. j, Phase occupancy histograms in epoch 4, similar to Fig. 6b. *: P < 0.05, **: P < 0.01, ***: P < 0.001.
Extended Data Fig. 5 Differences in SLIs cannot be explained by other experimental variables.
a, Schematic of the shuffling test based on theta frequency. SLIs in the same theta frequency bins (same color) were shuffled to create a null distribution of SLIs for each gain group. The same procedure was done for the shuffling based on the other parameters. b, Shuffling analysis to test if the difference in theta frequency (Fig. 3a) can explain the observed SLIs. The difference in the median SLI compared to epoch 1 was computed and tested against the null distribution. The differences in SLI between epoch 1 and the low and high gain groups were larger than the null distribution, demonstrating that the difference in theta frequency cannot explain the observed effect of SLI. Low: P <= 1.00 ×10−3, Mid: P = 0.249, High: P <= 1.00 ×10−3. c, Shuffling analysis to test if the difference in distance traveled by the rat to pass through the field in the lab frame can explain the observed SLIs. The decrease in SLIs in the low and high gain conditions was greater than the null distribution. Low: P <= 1.00 ×10−3, Mid: P = 0.0870, High: P <= 1.00 ×10−3. d, Shuffling analysis to test if the difference in the animal’s speed can explain the observed SLIs. The decrease in SLIs in the low and high gain conditions was greater than the null distribution. Low: P <= 1.00 ×10−3, Mid: P = 0.127, High: P <= 1.00 ×10−3. e, Shuffling analysis to test if the difference in time since the start of the experiment can explain the observed SLIs. Because epoch 1 is temporally segregated from epoch 3 by definition, shuffling was performed only using epoch 3 data. The decrease in SLIs in the low and high gain conditions compared to the mid gain condition was greater than the null distribution. Low: P <= 1.00 ×10−3, Mid: P = 8.00 ×10−3, High: P <= 1.00 ×10−3. Multiple comparisons correction was not applied for these shuffling analyses. **: P < 0.01, ***: P < 0.001.
Extended Data Fig. 6 Differences in SLIs cannot be explained by a biased sample of bimodal units.
a, Histograms of theta phase preference for example units classified as unimodal, bimodal, and unclassified ( > 2 peaks) units. Pyramidal cells in the deep layer of CA1 tend to exhibit strong firing in both the early and late phases of theta (bimodal cells), while cells in the superficial cell layer tend to fire only in the late phases of theta37,100 (unimodal cells). X-axis shows the theta phase repeated for two cycles. b, Number of units classified in each category. No significant difference in the distribution was observed among gain groups. This finding suggests that gain manipulation affects the relative size of the second lobe while sparing the modality of theta phase preference; for instance, bimodal units maintain their bimodality despite a smaller second lobe during gain manipulation. χ2(6) = 4.45, P = 0.616; chi-squared test. c, Smoothed phase coding plots for units classified as unimodal and bimodal cells. The plot for the bimodal cells showed a larger second lobe. d, Shuffling analysis to test if the difference in the sampling of unit modality can explain the observed SLIs. The decrease in SLIs in the low and high gain conditions was greater than the null distribution. The finding complements that of b, together demonstrating that the effect of gain on the size of the second lobe is not due to the change in the theta modality of the units or a biased sampling of unimodal/bimodal units across gain groups. Low: P <= 1.00 ×10−3, Mid: P = 0.229, High: P <= 1.00 ×10−3. Multiple comparisons correction was not applied. ***: P < 0.001.
Extended Data Fig. 7 Further characterization of the diminishment of the second lobe.
a, Slow, medium, and two fast gamma components averaged across sessions. Gamma components were extracted using the unsupervised clustering method of Zhang et al.103. The algorithm computed the frequency and the phase power matrix (FPP) for each theta cycle and obtained the groups of pixels in this theta phase–frequency space whose power co-fluctuates across theta cycles using k-mean clustering. The gamma components are coupled to theta phases that match previous studies68,103,113. We observed a slow gamma component at a frequency range of ~20–60 Hz associated with CA3 inputs (first column) and a medium gamma component at a frequency range of ~70–140 Hz associated with MECIII inputs67,68 (second column). The two fast gamma components (last 2 columns; > ~100 Hz) may include spiking artifacts107 and were not used for further analyses. b, Spike–medium gamma coupling comparison between gains, limited to the lower half of the medium gamma range ( ~ 70–105 Hz) to minimize the overlap in frequency with fast gamma (n = 151 units). Overall: W(2) = 8.78, P = 0.0124 (two-sided); Low vs. Mid: β = 0.0131, s.e. = 4.49 ×10−3, t(148) = 2.92, P = 4.01 ×10−3, Low vs. High: β = 8.07 ×10−3, s.e. = 4.85 ×10−3, t(148) = 1.66, P = 0.0985, Mid vs. High: β = −5.07 ×10−3, s.e. = 3.70 ×10−3, t(148) = −1.37, P = 0.172; Wald test followed by t-statistics/two-sided P values from the LMEM. Each violin plot shows the median (white circle), IQR (gray line), and distribution outline. c, Conceptual schematics of the network dynamics during epoch 4. In epoch 4, allothetic input is ablated. Note that the idiothetic Gaussian is assigned the larger amplitude (assigned to the allothetic Gaussian in epoch 1), since idiothetic input has the primary control over the hippocampal map in this condition. d, Position–phase plots of model neurons in epochs 1 and 4. The processing lobe diminished in epoch 4 compared to epoch 1 (same as the middle panel of Fig. 7c).
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Sueoka, Y., Jayakumar, R.P., Madhav, M.S. et al. Allothetic and idiothetic spatial cues control the multiplexed theta phase coding of place cells. Nat Neurosci 28, 2106–2117 (2025). https://doi.org/10.1038/s41593-025-02038-6
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DOI: https://doi.org/10.1038/s41593-025-02038-6
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