Description of IOR Paradigm
IOR was first described by Michael Posner and Yoav Cohen, who discovered that, contrary to their expectations, reaction time (RT) to detect objects appearing in previously cued locations was longer when compared to locations not previously cued. Specifically, IOR was described as "an inhibitory effect produced by a peripheral (or exogenous) cue or target."
In the experiment that demonstrated the paradigm, participants were instructed to fixate on a center box that was flanked with a box on its right and left sides. Each trial began with the brightening of the outline of one of the peripheral boxes that was randomly selected for 150 ms. During the trial, a target (a bright filled square) occurs in the center box at either 0, 50, 100, 200, 300, or 500 ms after the initial brightening. Participants had to respond to the target as quickly as possible by pressing a specified key. Participants’ performance in RT on the cued side increased the first 150 ms; however, they then experienced inhibition of target RT on the cued side compared to the uncued side after 300 ms.
Read more about this topic: Inhibition Of Return
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