Fig. 1. Schematic task depiction.

The Poffenberger Paradigm depends on the brief stimulation of one or the other visual hemi-field by a briefly presented probe, detection of which must be signaled by the right hand. The arrows schematically depict task flow under a within-hemispheric conditions, when the probe stimulates the visual cortex that is within the same hemisphere as the responding motor cortex (note that the red arrow does not cross the mid-line), and b inter-hemispheric conditions, the probe stimulates the visual cortex that is in the opposite hemisphere as the responding motor cortex (note that the red arrow crosses the mid-line). In the current study response hand was maintained to the dominant right hand, therefore within and inter-hemispheric conditions were created by presenting the probe in the right or left visual field.