Fig. 4
a Line segment plots in which each gray line links a pair of mean visual processing speed (VPS) values obtained by each control and an age- and gender-matched acquired brain injury (ABI) patient. Thus each gray line shows the VPS responses (at the left and right ends of each straight line). The slope of each line indicates the difference between the components of each data pair. Bold line, the mean trend. b It represents graphically the error bars in the two groups