Hemispheric activation vs spatio-motor cueing in visual neglect: A case study

Pseudoneglect: a review and meta-analysis of performance factors in line bisection tasks

“…Chokron and Imbert [30] investigated the eect of reading style, a possible determinant of habitual scanning direction, on visual line bisection. French subjects (who read left-to-right) tended to err left while Israeli subjects (who read right-to-left) tended to err right, and report results similar to those of Halligan and Marshall [44] and Chokron and Imbert [29]. Ishiai et al [59] measured eye movements in neurologically normal subjects and found that visual scanning of line stimuli occurs predominantly from left-to-right.…”

“…Luh [73] reported that subjects erred leftward, with the error magnitude increasing with line length to a greater degree in left hemispace presentations than in right hemispace presentations. Halligan et al [44] found that their subject erred leftward when bisecting with the left hand and erred rightward when bisecting with the right hand, with the magnitude or error increasing as a function of line length. Manning et al [74] found that some of their subjects erred to the left of veridical center while others erred to the right, with error magnitude increasing as a function of line length in all subjects.…”

“…However, two studies found that when the right hand was used, subjects erred to the right of veridical, whereas when the left hand was used, subjects erred to the left of veridical [44,111]. Chokron and Imbert [31] report the opposite eect.…”

“…However, Halligan et al [44] found that subjects erred left when scanning was initiated from the left side of the page and erred right when scanning was initiated from the right side of the page. The eect was greater when the hand used to perform the bisection corresponded to the side on which scanning was initiated (e.g., when the right hand was used while scanning from right-toleft and vice versa).…”

Asymmetries of Visuospatial Attention in Schizophrenia

“…This phenomenon was called pseudoneglect because normal subjects' errors were in the opposite direction to those made by patients with neglect. However, other studies did not confirm this finding [9,10]. Further, when normal subjects are asked to bisect radial or vertical lines, they usually deviate away from, or above the true midpoint, respectively [11,12].…”