title: The Leuven Perceptual Organization Screening Test (L-POST), an online test to assess mid-level visual perception.
abstract: Neuropsychological diagnostic tests of visual perception mostly assess high-level processes like object recognition. Object recognition, however, relies on distinct mid-level processes of perceptual organization that are only implicitly tested in classical tests. The Leuven Perceptual Organization Screening Test (L-POST) fills a gap with respect to clinically oriented tests of mid-level visual function. In 15 online subtests, a range of mid-level processes are covered, such as figure-ground segmentation, local and global processing, and shape perception. We also test the sensitivity to a wide variety of perceptual grouping cues, like common fate, collinearity, proximity, and closure. To reduce cognitive load, a matching-to-sample task is used for all subtests. Our online test can be administered in 20-45 min and is freely available at www.gestaltrevision.be/tests . The online implementation enables us to offer a separate interface for researchers and clinicians to have immediate access to the raw and summary results for each patient and to keep a record of their patient's entire data. Also, each patient's results can be flexibly compared with a range of age-matched norm samples. In conclusion, the L-POST is a valuable screening test for perceptual organization. The test allows clinicians to screen for deficits in visual perception and enables researchers to get a broader overview of mid-level visual processes that are preserved or disrupted in a given patient.
authors.affiliation: Laboratory of Experimental Psychology, University of Leuven, Tiensestraat 102, box 3711, 3000, Leuven, Belgium.
authors.forename: Katrien
authors.initials: K
authors.lastname: Torfs
authors.forename: Kathleen
authors.initials: K
authors.lastname: Vancleef
authors.forename: Christophe
authors.initials: C
authors.lastname: Lafosse
authors.forename: Johan
authors.initials: J
authors.lastname: Wagemans
authors.forename: Lee
authors.initials: L
authors.lastname: de-Wit
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D003463:Cues; D003936:Diagnosis, Computer-Assisted; D004192:Discrimination, Psychological / Q000502:physiology*; D005260:Female; D005366:Figural Aftereffect / Q000502:physiology; D006801:Humans; D002532:Intracranial Aneurysm / Q000175:diagnosis / Q000503:physiopathology; D008297:Male; D008403:Mass Screening / Q000295:instrumentation*; D008875:Middle Aged; D009039:Motion Perception / Q000502:physiology; D009483:Neuropsychological Tests; D009862:Online Systems; D046709:Pattern Recognition, Physiological / Q000502:physiology; D010466:Perceptual Closure / Q000502:physiology; D020521:Stroke / Q000175:diagnosis / Q000503:physiopathology; D011795:Surveys and Questionnaires; D014584:User-Computer Interface; D014796:Visual Perception / Q000502:physiology*