Fig. 4. Box and whisker plots of visual sensitivity thresholds (trial setting of threshold response and corresponding intensity levels) across three testing groups: males (gray, N=22); females in a non-reproductive state (white, N=20) and reproductive state females (cross-hatched; N=12). The center horizontal line marks the median of the sample, and the length of each box shows the range containing 50% of all values with the box edges representing the first and third quartiles. The open circles represent far outside values or outliers (>first or third quartile ± 3xinterquartile range). Each group includes data from individuals obtained on their initial test only. ^*P<0.05.