Extended Data Fig. 3: Anticipatory behaviour and drift-speed pattern during baseline.
From: Population dynamics of head-direction neurons during drift and reorientation
a. Top row: Mean bump of activity divided between positive (blue) and negative (pink) head angular velocities (HAV). Bar graph: Mean difference between measured and decoded HD (n = 42x5000 data points from baseline recordings, between both groups; Two-sided Wilcoxon signed rank test: HAV < 0: p = 0, Z = 83.71; HAV > 0: p = 0, Z = −76.81). Bottom row: Mean cross-correlation of the mean bump of activity, per epoch, with the mean bump of activity for positive (blue) and negative (pink) HAVs. Bar graph: Mean peak angle of cross-correlation (n = 42x5000 data points from baseline recordings, between both groups; Two-sided Wilcoxon signed rank test: HAV < 0: p = 0, Z = −115.24; HAV > 0: p = 0, Z = 113.13). Both analyses show a significant amount of anticipation of future heading by the HD network. b. Top: Drift-speed heatmap showing an increased latency in updating the internal representation as the HAV becomes larger. Bottom: same pattern as the above, seen here in Internal HAV-versus-Measured HAV space. Notice the deviations of the mean signal (orange) from the diagonal, at high measured HAVs. Bar graphs indicate mean ± SEM.
