2023/04/03 by Lotfi B. Merabet, Claire E. Manley, Zahide Pamir +3 · 1 voice · 20 citations
Medicine · Neuroscience · Psychology · #Anatomy #Association (psychology) #Audiology #Coherence (philosophical gambling strategy) #Developmental psychology #Dorsum #Medicine #Motion perception #Neuroscience #Neurotypical #Perception #Physical medicine and rehabilitation #Psychology #Spatial Neglect and Hemispheric Dysfunction #Tactile and Sensory Interactions #Visual perception #Visual perception and processing mechanisms #Visual processing
paper · pdf · doi:10.1111/dmcn.15591
published in Developmental Medicine & Child Neurology 65(10), 1379-1386 (Wiley)
openalex publication_date 2023/04/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
AIM: Using a visual psychophysical paradigm, we sought to assess motion and form coherence thresholds as indices of dorsal and ventral visual stream processing respectively, in individuals with cerebral visual impairment (CVI). We also explored potential associations between psychophysical assessments and brain lesion severity in CVI. METHOD: Twenty individuals previously diagnosed with CVI (mean age = 17 years 11 months [SD 5 years 10 months]; mean Verbal IQ = 86.42 [SD 35.85]) and 30 individuals with neurotypical development (mean age = 20 years 1 month [SD 3 years 8 months]; mean Verbal IQ = 110.05 [SD 19.34]) participated in the study. In this two-group comparison, cross-sectional study design, global motion, and form pattern coherence thresholds were assessed using a computerized, generalizable, self-administrable, and response-adaptive psychophysical paradigm called FInD (Foraging Interactive D-prime). RESULTS: Consistent with dorsal stream dysfunction, mean global motion (but not form) coherence thresholds were significantly higher in individuals with CVI compared to controls. No statistically significant association was found between coherence thresholds and lesion severity. INTERPRETATION: These results suggest that the objective assessment of motion and form coherence threshold sensitivities using this psychophysical paradigm may be useful in helping to characterize perceptual deficits and the complex clinical profile of CVI. WHAT THIS PAPER ADDS: In participants with cerebral visual impairment (CVI), motion (but not form) coherence thresholds were significantly higher compared to controls. These psychophysical results support the notion of dorsal stream dysfunction in CVI.