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. Author manuscript; available in PMC: 2012 Aug 24.
Published in final edited form as: Vision Res. 2008 Nov 26;49(2):228–236. doi: 10.1016/j.visres.2008.10.015

Figure 1.

Figure 1

Illustration of generalized flash suppression (GFS) experimental paradigm. The figure shows the stimulation sequence and the states (held or released) of the lever provided to monkeys. Monkeys were required to maintain fixation after the appearance of fixation spots (FIXATION). They fixated on the central spots for 300 ms (in some sessions 500 ms) before the presentation of the target stimulus (red disk). After 1400 ms of the target only presentation (TARGET ON), a surrounding pattern consisting of randomly moving dots was added to the presentation (SURROND ON). Monkeys were required to hold the lever as long as the target was visible. If the target became invisible, either through perceptual suppression or physical removal, they had to release the lever within 800 ms. (Adapted from Fig. 1. in (Wilke et al., 2006) with permission)