Correlation of correct estimation with variability of response latency. The number of correct estimations was plotted against the variability of the response latency of each cell, quantified by the median of the latency quartile ranges. Data are separately shown for upward and downward movements, both for absolute and relative latencies. Each of the five experiments was analyzed separately. In experiments 1 – 3 the number of correct estimations for upward and downward directions (indicated by different colours) correlated with the quartile range when considering estimations based on absolute and relative latencies separately. Small quartile ranges correlated with better estimation and vice versa. However, the number of correct estimations for the same direction was always lower when based on relative latencies. Experiments 4 and 5 showed high variability in response latencies and very low estimation quality.