FIG. 6.

A–C: distribution of vector strengths across the unit sample. Panels indicate data from modulation frequencies of 20–21, 40–42, and 60–64 Hz, as indicated. Every vector strength is shown, regardless of statistical significance. In each panel, each box and whiskers represents the distribution of vector strengths at 1 modulation depth: horizontal lines indicate 25th percentile, median, and 75% percentile, whiskers indicate ranges of data within 1.5 times the interquartile range, and plus signs indicate outlying points. Circles indicated the medians values for isolated single units. D–F: percentage of vector strengths at each modulation depth that were significant according to a Rayleigh test (P < 0.001). The bars represent the population of all single- and multiunits (n = 267), and circles represent isolated single units (n = 61).