Fig. 5
RF changes during WM do not account for changes in noise correlations. a RFs of three example neurons during fixation and memory. The RFs of two neurons (red and blue) expand and shift toward the remembered location, increasing their RF overlap. The RF of the third neuron (green) is mostly unchanged during WM, resulting in a decrease in overlap with the other neurons during WM. b During memory, RFs expand and shift toward the remembered location. Top histogram shows the distribution of changes in RF size during the memory period. RFs expanded during memory (n = 51 neurons, p = 0.014). Bottom histogram shows the distribution of changes in the distance of the RF center from the memory location. RFs shifted toward the remembered location (n = 51, p = 0.006). c RF overlap during fixation and memory. For pairs identified as partially overlapping (ratio of shared RF 0.1–0.4) during fixation, plot shows the ratio of shared RF during fixation and memory. d Noise correlation as a function of change in RF overlap. For partially overlapping pairs, the top plot shows the noise correlation during memory IN (red) and OUT (blue) as a function of the change in RF overlap. Pairs which experience a decrease in RF overlap during memory have the highest noise correlations during memory IN (r = −0.49, p = 0.0003). There was no significant relationship between change in RF overlap and noise correlation for memory OUT (r = −0.23, p = 0.116). Bottom histogram shows the distribution of changes in RF overlap across pairs. e Change in noise correlation of partially overlapping pairs during In-flank memory. Plot shows noise correlation during memory IN vs. OUT, for pairs of neurons meeting the definition of partially overlapping RFs during fixation and memory (black, n = 31), or only during fixation (gray, n = 17). Noise correlations increased during In-flank memory for pairs with partially overlapping RFs during both fixation and memory (n = 31 pairs, p = 0.041). There was no significant change in noise correlation for the pairs of neurons with partially overlapping RFs only during fixation (n = 17 pairs, p = 0.136). Histograms in the upper right show the distributions of change in noise correlation across pairs
