Skip to main content
. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Arch Phys Med Rehabil. 2010 Mar;91(3):452–459. doi: 10.1016/j.apmr.2009.10.032

Fig. 1.

Fig. 1

Protocol for the a) walking and b) STS tasks. Blocks of slip trials (S) are shown in gray, blocks of nonslip trials (NS) in white, and the block of mixed slip and nonslip trials in vertical lines. For the walking task, the sequence of trials comprised 10 initial nonslipping (NS) trials, followed by a block of 8 slips, a block of 3 nonslipping trials, a second block of 8 slips, a second block of 3 nonslip trials, then a mixed block of 8 slip and 7 nonslip trials (S17–18, NS×2, S19, NS, S20, NS, S21–22, NS×2, S23, NS, S24). For the STS task, the sequence comprised 4 nonslip trials, followed by a block of 5 slips, a block of 3–5 nonslip trials (a 4th or 5th trial was performed if stepping occurred in the preceding trial), and a final block of 2 reslips (RS). For both tasks, all trials were unannounced, and participants were only aware that a slip “may or may not occur.”