Abstract and Keywords
A mechanism referred to as inhibition of return (IOR) was proposed by Michael Posner and colleagues (Posner and Cohen, 1984; Posner et al., 1985) to account for delayed responses to stimuli presented in previously attended regions or on previously attended objects. This increase in response times is intricately linked to the orienting machinery of the oculomotor system and, as such, it was proposed that IOR plays a crucial role in facilitating search behaviour. Properties of IOR that have been identified using a simple cuing paradigm (e.g. IOR can be coded in environmental and object coordinates) are consistent with this functional interpretation. The interaction of IOR with oculomotor phenomena is reviewed with an emphasis on how orienting behaviour is modulated by IOR. Studies using a wide variety of methods demonstrate that fixations that return gaze to a recently fixated region (even when these refixations occur more frequently than chance) suffer a temporal cost, no doubt because whatever processes encourages the return of attention must overcome the inhibitory traces left behind by prior orienting.
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