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. Author manuscript; available in PMC: 2013 Jun 10.
Published in final edited form as: Behav Processes. 2009 Dec 14;83(2):191–196. doi: 10.1016/j.beproc.2009.12.009

Figure 1.

Figure 1

(A) Example of an ascending trial in small range, (B) example of a descending trial in small range, (C) example of an ascending trial in large range, (D) example of a descending trial in large range. Note that the background screen color was red for all ascending trials and blue for all descending trials.