Bisection of shapes and lines: Analysis of the visual and motor aspects ofpseudoneglect

This study examined the visual and motor components of pseudoneglect as exp ressed on horizontal bisection tasks. Ten participants were tested on bisec tion of lines and elliptical shapes and judgement of pretransected lines. R esults showed the same magnitude of leftward error on all three tasks, in c ontrast to previous findings for patients with visuospatial neglect who are known to bisect ellipses and circles much more accurately than lines. Part icipants mean line bisection error was significantly further to the left th an the mean subjective midpoint found on the judgement cask. The findings c ontradict the claim that the visual component of pseudoneglect is caused by the same mechanism that causes visuospatial neglect but support the hypoth esis that the motor component of pseudoneglect is similar to directional hy pometria.