Tuning properties of individual circuit components and stimulus-specificity of experience-driven changes.

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1 Supplementary Figure 1 Tuning properties of individual circuit components and stimulus-specificity of experience-driven changes. (a) Left, circuit schematic with the imaged component (L2/3 excitatory neurons) shown in green and examples of their tuning properties. Right, histograms of the orientation selectivity index (OSI) and direction selectivity index (DSI) of L2/3 excitatory neurons (n = 448 neurons, 13 mice). (b) Changes in tuning properties of L2/3 excitatory neurons after passive experience or learning (passive: 6 mice; learning: 5 mice). In a subset of mice, tuning properties of each circuit component were measured again on day 5 and these values

2 were compared to those of day 0. Population response change was defined as in Figure 3. T indicates the target stimulus. (c-d) Data are presented as in a-b for RSC axonal boutons (c, n = 599 boutons, 12 mice; d, passive: 6 mice; learning: 6 mice). (e-f) Data are presented as in a-b for L4 excitatory neurons (e, n = 378 neurons, 10 mice; f, passive: 5 mice; learning: 5 mice). (g-h) Data are presented as in a-b for SOM-INs (g, n = 100 neurons, 14 mice; h, passive: 7 mice; learning: 7 mice). (i-j) Data are presented as in a-b for PV-INs (i, n = 127 neurons, 11 mice; j, passive: 6 mice; learning: 5 mice). (k-l) Date are presented as in a-b for VIP-INs (k, n = 123 neurons, 9 mice; l, passive: 5 mice; learning: 4 mice). (m) Distribution of the target stimuli used in this study (passive: 35 mice; learning: 67 mice).

3 Supplementary Figure 2 Imaging GCaMP6f across cortical layers. (a) Coronal slice of V1 expressing GCaMP6f, with tdtomato marking inhibitory neurons. GCaMP6f expression is evident in all layers including L4 which shows weaker expression than other layers. (b) In vivo images of different layers. L5 was readily identifiable by the appearance of large cell bodies (arrowheads) and avoided during L4 imaging (n = 3 mice).

4 Supplementary Figure 3 Experience-dependent changes in response properties of each excitatory circuit component. (a) Circuit schematic with the imaged component (RSC axonal boutons) shown in green. (b) Top left, heat maps of normalized trialaverage df/f of individual RSC axonal boutons responsive at either time point and their mean trial-average df/f. Boutons are sorted in the order of peak timing of the naive condition in both cases so that direct cell-to-cell comparisons can be made. Black boxes indicate

5 non-responsive boutons either because they stopped responding after experience or they were non-responsive in the naive state but became responsive after experience. Bottom left, example responses of boutons. Middle, naive and learning conditions. Right, learning and post-learning anesthesia conditions. (c-d) Data are presented as in a-b for L2/3 excitatory neurons. (e-f) Data are presented as in a-b for L4 excitatory neurons. (g) RSC inactivation in the naive state does not change the ramp index of L2/3 excitatory neurons (P = 0.43, one-tailed bootstrap, control: n = 146 neurons, 13 mice (adapted from Figure 4h); RSC inactivation: n = 11 neurons, 3 mice).

6 Supplementary Figure 4 Ramp index over sessions in each excitatory circuit component. (a) Circuit schematic with the imaged component (RSC axonal boutons) shown in green. (b) Top, mean ramp index of responsive RSC axonal boutons (P = 0.12, one-way ANOVA, n = 6 mice, left) and mean trial average df/f of the RSC axonal boutons that were responsive at each time point across sessions (right) for the passive condition. Bottom, learning condition (*P = 0.019, n = 6 mice). Inset, population activity in blocks of 5 trials each from the earlier phase of day 1. (c) Behavioral performance of the RSC learning group. (d-f) Data are presented as in a-c for L2/3 excitatory neurons (e, passive: P = 0.39, n = 5 mice; learning: ***P < 0.001, n = 7 mice). (g-i) Data are presented as in a-c for L4 excitatory neurons (h, passive: P = 0.60, n = 5 mice; learning: P = 0.98, n = 5 mice).

7 Supplementary Figure 5 Running does not affect the post-learning response of L2/3 excitatory neurons. (a) Left, circuit schematic with the imaged component (L2/3 excitatory neurons) shown in green. Right, responses of four example L2/3 excitatory neurons in hit (left) and miss (right) trials in the last two sessions (days 3 and 4). Thin line, individual trials; thick lines, average. Individual hit trials for this panel were selected from a trial before and after each miss trial. In all miss trials included in this figure, mice did not run above threshold during the response period. Note that L2/3 excitatory neurons showed ramp-up activity in both hit and miss trials. (b) Top, mean trial-average df/f in hit and miss trials, averaged across all responsive L2/3 excitatory neurons, showing indistinguishable responses in both trial types. The miss trial trace appears noisier due to the fewer number of trials. Bottom, mean running traces in hit and miss trials. (c) Running enhances L2/3 excitatory neuron responses in naive (***P < 0.001, Wilcoxon signed-rank test, n = 167 neurons, 12 mice) and passive (***P < 0.001, n = 37 neurons, 6 mice), but not in learning conditions (P = 0.34, n = 70 neurons, 7 mice). Stationary and running trials were the trials in which peak running speed was below and above the threshold, respectively. These correspond to miss and hit trials in the learning condition.

8 Supplementary Figure 6 Visual stimulus-shock association ( conditioning ) induces ramp-up responses in RSC axons and L2/3 excitatory neurons independent of running. (a) Schematic of the experiment. Tail shock was given in randomly-selected 80% of the trials and responses were analyzed in the remaining 20% of the trials without the shock. (b) Mean ramp index for RSC axonal boutons (*P = 0.017, one-tailed bootstrap, naive: n = 22 boutons, 3 mice; conditioning: n = 66 boutons, 3 mice) and L2/3 excitatory neurons (**P = 0.001, naive: n = 38 neurons, 7 mice; conditioning: n = 16 neurons, 7 mice). (c) Left, circuit schematic with the imaged component (RSC axonal boutons) shown in green. Top right, heat maps of normalized trial-average df/f of individual boutons sorted by peak timing. Middle right, mean df/f of all responsive boutons within each condition. Bottom right, mean running traces in each group, showing that mice generally did not run in this paradigm. (d) Data are presented as in c for L2/3 excitatory neurons.

9 Supplementary Figure 7 Mean and example responses of SOM-INs. (a) Left, circuit schematic with the imaged component (SOM-INs) shown in green. Middle, mean trial-average df/f of SOM-INs that are responsive in either of the two compared conditions (naive/passive: n = 41 neurons, 7 mice; naive/learning: n = 29 neurons, 7 mice; learning/post-learning anesthesia: n = 6 neurons, 2 mice). Right, example responses of SOM-INs. (b) Left, circuit schematic with the imaged component (SOM-INs) shown in green. SOM-IN activity was imaged after learning while RSC was inactivated with muscimol injections. Right, mean trial-average df/f of SOM-INs that are responsive in at least one of the three conditions. RSC inactivation after learning suppresses SOM-IN activity (n = 8 neurons, 2 mice).

10 Supplementary Figure 8 Response dynamics of parvalbumin (PV) and vasoactive intestinal peptide (VIP) expressing inhibitory neurons during passive experience and learning. (a) Left, circuit schematic with the imaged component (PV-INs) shown in green. Right, same population of PV-INs expressing GCaMP6f imaged 4 d apart. (b) Spatial map of responsive PV-INs in an image field from a mouse before (left) and after passive experience or learning (right), pseudocolor-coded according to the activity levels. (c) Left, population response change of PV-INs over days in passive and learning groups (passive: p < 0.001, n = 31 neurons, 6 mice; learning: p < 0.001, n = 34 neurons, 5 mice, one-way repeated measures ANOVA). Middle, changes in the number of responsive PV-INs at each time point normalized to the value on day 0 in passive and learning groups (passive: p < 0.001, n = 6 mice; learning: p < 0.001, n = 5 mice, one-way repeated measures ANOVA). Right, df/f of the PV-INs that were responsive at each time point in passive and learning groups. n.d. = not determined because there were no responsive neurons. (d-f) Data are presented as in a-c for VIP-INs. Left in f: passive: p < 0.001, n = 28 neurons, 5 mice; learning: p < 0.001, n = 31 neurons, 4 mice. Middle in f: passive: p < 0.001, n = 5 mice; learning: p < 0.001, n = 4 mice. (g) Example activity of all VIP-INs imaged from one mouse during passive experience (left) or learning (right). Note that in both groups running increases spontaneous activity of VIP-INs but visual stimuli suppress such running-induced activity, indicated by arrows. (h) Top, mean visually-evoked df/f of all VIP-INs in running or stationary trials for the passive (left) and learning (right) groups. Bottom, mean spontaneous or evoked df/f in each condition (passive: ***P < 0.001, n = 117 neurons, 5 mice, Wilcoxon signed-rank test with Bonferroni correction; learning: ***P < 0.001, n = 105 neurons, 4 mice).

11 Supplementary Figure 9 Validation of SSFO. (a) Schematic of the experiment. Whole-cell current-clamp recordings were performed in SOM-INs expressing SSFO-EYFP in V1 acute slices. (b) Example SOM-IN showing changes in the membrane potential by SSFO activation with 470 nm blue light and deactivation with 590 nm amber light. (c) Changes in the mean membrane potential of SOM-INs (***P < 0.001, P > 0.05 between naive and deactivation, one-way repeated measures ANOVA with post-hoc Tukey test, n = 5 neurons, 3 mice). (d) Example SOM-IN showing excitability changes by SSFO activation and deactivation with current injections. (e) Changes in firing rates by SSFO activation (left) and deactivation (right) with different current injections. Different symbols indicate different cells. (f) Left, L2/3 PV-INs expressing SSFO-EYFP (arrowheads) and putative excitatory neurons expressing GCaMP6f imaged in vivo. Right, model of the experiment. (g) Left, visually-evoked activity of three example L2/3 putative excitatory neurons before and after SSFO activation and deactivation in PV- INs. Right, mean df/f of L2/3 putative excitatory neurons by SSFO activation and deactivation in PV-INs (***P < 0.001, **P = 0.001, P > 0.05 between naive and deactivation, Wilcoxon signed-rank test with Bonferroni correction, n = 47 neurons, 3 mice). (h) Control for the SOM-IN reactivation experiment (Figure 6d-g) without SSFO expression. Left, schematic of the experiment. Middle, changes in the ramp index of individual L2/3 excitatory neurons by blue light (P = 0.23, Wilcoxon signed-rank test, n = 26 neurons, 5 mice). Right, changes in the ramp index of the same neurons by amber light (P = 0.32, n = 26 neurons, 5 mice). The pie chart illustrates the fractions of neurons showing a significant increase or decrease in the ramp index. (i) Model of SOM-IN activation after learning. SOM-INs gate top-down inputs arriving at distal dendrites. SOM-INs may also inhibit another class of inhibitory neurons ( IN ) that normally gate bottom-up inputs arriving at the perisomatic dendrites of L2/3 excitatory neurons. After learning, these INs are released from SOM-IN inhibition and become active to gate off the bottom-up inputs. SOM-IN activation suppresses these INs and disinhibits the bottom-up inputs.

12 Supplementary Figure 10 Model. Top, summary of our findings. Passive experience and associative learning shift the relative balance in the input strengths between the top-down pathway from RSC and bottom-up pathway from L4 to L2/3. In addition, the activity change of SOM-INs alters the way the two distinct inputs are processed. In the naive condition (left), SOM-INs are relatively active, gating off top-down inputs arriving at L1. After learning (right), SOM-INs become less active, allowing the top-down inputs to have a stronger impact on L2/3 excitatory neurons. Bottom, hypothetical circuits underlying our findings. RSC provides top-down excitatory inputs to the distal dendrites of L2/3 excitatory neurons and indirectly inhibits the bottom-up inputs through L6 NTSR1 neurons (NRT: thalamic reticular nucleus; dlgn: dorsal lateral geniculate nucleus). SOM-INs inhibit the distal dendrites of L2/3 neurons receiving top-down inputs and indirectly disinhibit basal dendrites receiving bottom-up inputs. These mechanisms allow a dynamic and analog control of the relative balance between bottomup and top-down processing.

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