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. Author manuscript; available in PMC: 2015 Jan 20.
Published in final edited form as: Brain Lang. 2014 Sep 29;138:27–37. doi: 10.1016/j.bandl.2014.09.003

Figure 2. Speed discrimination and contrast detection thresholds.

Figure 2

a and b. Bar graphs of speed discrimination and contrast detection thresholds. a. Median ± SEM speed discrimination thresholds (Weber fraction) in adults and children. b. Median ± SEM contrast detection thresholds (%) in adults and children. c and d. Scatter plots of participants’ age and the psychophysical thresholds. c. Speed discrimination thresholds ±1SD. d. Contrast detection thresholds ±1SD. For speed discrimination, two thresholds were measured for each participant with gratings of slightly different contrast (16 and 24%). Intersecting blue and red lines mark mean values for each group of participants.

Adults = Blue. Children = Red.

Circles = Normal Readers. Squares = Developmental Dyslexia