On the staircase method

On the practice of dichotomization of continuous variables
by MacCallum et al 2002 in Psychological Methods
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when you split your data into multiple
categories and run an ANOVA, you: lose information, lose effect size
and power, and you run the risk of finding spurious interactions/main
effects, and also risk overlooking non-linear effects.
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Information from Brian, K.
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Thanks!

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Also see the following information;

Forced choice staircases with fixed steps, Vision Research, 38, 1998, pp.1861-1881
by Miguel ? A. Garcia-Perez