Odd-even short forms of the Judgment of Line Orientation Test

The Judgment of Line Orientation (JLO) Test is a relatively pure measure of visuospatial perception, analysis, and judgment. Among those with brain injury, the JLO is sensitive to right-hemisphere insult, particularly insult to the posterior right hemisphere. Individuals presenting other cognitive deficits, however, such as attentional dysfunction or problems with sustained effort may have difficulty completing the full 30-item JLO test. In an effort to minimize these factors, as well as maximize the probability of obtaining an interpretable protocol, the efficacy of 15-item versions of the JLO was explored. The results of this investigation suggest that utilizing the doubled raw score from odd or even 15-item short forms is a viable alternative to administering the full30-item version of the JLO.