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Mean LNRadd amplitudes for the control subjects (open symbols) and OA patients (filled symbols) derived from the summed responses to rapid-on and rapid-off sawtooth flicker that was either G (circles), Y (squares), or R (diamonds). Error bars represent ±1 sem. Brackets and asterisks indicate statistically significant comparisons, where * indicates p < 0.05 and ** indicates p < 0.01.
