Hemispatial neglect is a failure of attending to the left half-space resulting from lesions of the right hemisphere. It is believed to be an attentional dysfunction, involving defi cits in disengagement of attention from the objects in right visual fi eld, as well as in inhibition of return to the right visual fi eld. Rosetti and Rode (1998) proposed a method of ameliorating symptoms of neglect by means of prismatic lenses, which shift vision (e.g. 15° to the right or left) and thereby trigger changes in visuo-spatial integration. However, it is not clear, which particular cognitive mechanisms are affected by the method. Furthermore, leftward prism adaption in healthy subjects causes an effect similar to hemispatial neglect. Similarly, cognitive and neural mechanisms underlying this effect remain yet to be identifi ed. Two experiments were conducted, which aimed at indicating attentional processes modifi ed by prism adaptation in case of “neglect-like” effect in healthy individuals. Posner’s location-cuing task paradigm was used in order to differentiate processes of endogenous and exogenous orienting of attention, as well as to measure the effect of inhibition of return. Participants performed the task before and after prism adaptation. Results are discussed in light of recent theories of neglect.
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