Extended Data Fig. 7: Population vector stability and decoding of visual cue angle.
From: Moving bar of light evokes vectorial spatial selectivity in the immobile rat hippocampus
a, Stability for CCW tuned responses (number of cells, n = 310). Color indicates correlation coefficient between two non-overlapping groups of trials’ population responses (see Methods). The maximum correlation values were pre-dominantly along the diagonal. Maxima along x-axis and y-axis were significantly correlated (Circular correlation coefficient r = 0.97, p < 10−150). b, Same as a but using untuned stable cells (n = 266) showed significant ensemble stability (r = 0.91, p < 10−150). c, Same as a but using untuned and unstable cells (n = 306). This was not significantly different than chance (r = −0.16, p = 0.09). d, Same as a, using tuned cells with their spike trains circularly shifted in blocks of four trials, showed no significant stability (r = 1.1 x 10−3, p = 0.99). e–h, Same as a–d, but for CW data. i, Decoding CW direction shows similar results as in CCW direction (shown earlier in Fig. 2). Similar analysis as shown in Fig. 2 for the stimulus movement in CW direction. (Left) Decoding cue angle in 10 trials of CW cue movement, using all other CW trials to build a population-encoding matrix. Gray trace indices movement of visual bar, colored trace is the decoded angle. (Right) Same as left, for shuffle data. j, Same as i but using the untuned-stable cells in CW movement direction. k, Median error between stimulus angle and decoded angle over 10 instantiations of decoding 10 trials each for actual and cell ID shuffle data. Green dashed line indicates width of the visual cue; black dashed line indicates median error expected by chance.
