Inversion of perceived direction of motion caused by spatial undersampling in two children with periventricular leukomalacia

Morrone, Maria Concetta, Guzzetta, Andrea, Tinelli, Francesca, Tosetti, Michela, Del Viva, Michela, Montanaro, Domenico, Burr, David and Cioni, Giovanni (2008) Inversion of perceived direction of motion caused by spatial undersampling in two children with periventricular leukomalacia. Journal of Cognitive Neuroscience, 20 6: 1094-1106. doi:10.1162/jocn.2008.20061

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Author Morrone, Maria Concetta
Guzzetta, Andrea
Tinelli, Francesca
Tosetti, Michela
Del Viva, Michela
Montanaro, Domenico
Burr, David
Cioni, Giovanni
Title Inversion of perceived direction of motion caused by spatial undersampling in two children with periventricular leukomalacia
Journal name Journal of Cognitive Neuroscience   Check publisher's open access policy
ISSN 0898-929X
1530-8898
Publication date 2008-06
Sub-type Article (original research)
DOI 10.1162/jocn.2008.20061
Open Access Status File (Publisher version)
Volume 20
Issue 6
Start page 1094
End page 1106
Total pages 13
Place of publication Cambridge, MA, United States
Publisher M I T Press
Language eng
Abstract We report here two cases of two young diplegic patients with cystic periventricular leukomalacia who systematically, and with high sensitivity, perceive translational motion of a random-dot display in the opposite direction. The apparent inversion was specific for translation motion: Rotation and expansion motion were perceived correctly, with normal sensitivity. It was also specific for random-dot patterns, not occurring with gratings. For the one patient that we were able to test extensively, contrast sensitivity for static stimuli was normal, but was very low for direction discrimination at high spatial frequencies and all temporal frequencies. His optokinetic nystagmus movements were normal but he was unable to track a single translating target, indicating a perceptual origin of the tracking deficit. The severe deficit for motion perception was also evident in the seminatural situation of a driving simulation video game. The perceptual deficit for translational motion was reinforced by functional magnetic resonance imaging studies. Translational motion elicited no response in the MT complex, although it did produce a strong response in many visual areas when contrasted with blank stimuli. However, radial and rotational motion produced a normal pattern of activation in a subregion of the MT complex. These data reinforce the existent evidence for independent cortical processing for translational, and circular or radial flow motion, and further suggest that the two systems have different vulnerability and plasticity to prenatal damage. They also highlight the complexity of visual motion perception, and how the delicate balance of neural activity can lead to paradoxical effects such as consistent misperception of the direction of motion. We advance a possible explanation of a reduced spatial sampling of the motion stimuli and report a simple model that simulates well the experimental results.
Keyword Diplegic
Cystic periventricular leukomalacia
Motion
Q-Index Code C1
Q-Index Status Provisional Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Medicine Publications
 
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Created: Thu, 14 Jan 2010, 14:54:38 EST by Elissa Saffery on behalf of Faculty Of Health Sciences