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. Author manuscript; available in PMC: 2014 Feb 11.
Published in final edited form as: J Vis. 2011 Feb 10;11(2):9. doi: 10.1167/11.2.9

Figure 1.

Figure 1

Experimental paradigms. In all cases, observers initially fixated for 300–600 msec. They next pursued the stimuli (except for in the static experiment) that moved from left to right at 10, 20 or 30 deg/sec, for a total duration of 1.0 sec. A keypress at the end of the trial indicated which dot dimmed. A) Gap paradigm. The center spot was turned off 0, 100 or 200 msec before the dimming, which occurred either 300 or 500 msec after target motion onset. Only the four peripheral dots were dim candidates. B) Pursuit task without a gap, with and without a textured background. Any one of the five dots could dim, either 100, 300 or 500 msec after target motion onset. When the background texture was present it moved at the same velocity as the task stimulus. Note that the background texture was restricted from the region occupied by the 5-dot target. C) Static task. The task was identical to that depicted in (B) but the stimulus and background were stationary.