Judgment of Line Orientation (JLO) is a standardized test of visuospatial skills commonly associated with functioning of the parietal lobe in the right hemisphere.
[1] The test measures a person's ability to match the angle and orientation of lines in space.
[3] The complete test has 30 items, but short forms have also been created.
[4] In 1994, Arthur L. Benton developed the test from his study of the effects of a right hemisphere lesion on spatial skills.
It has been suggested that patients with Parkinson's disease perform poorly because of the complexity of task demands, not due to visuospatial deficits.