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Published on: November 20, 2015
Motion perception in preterm children: role of prematurity and brain damage
Andrea Guzzetta1, Francesca Tinelli, Maria M Del Viva
1Department of Developmental Neuroscience, Stella Maris Scientific Institute, University of Florence, Italy. a.guzzetta@inpe.unipi.it <a.guzzetta@inpe.unipi.it>
Insights
Preterm children show visual processing deficits. Brain damage in preterm infants significantly impacts visual perception, particularly for form-related tasks, suggesting ventral stream involvement.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatrics
Background:
- Preterm birth is associated with increased risk of neurodevelopmental impairments.
- Visual processing pathways, including dorsal and ventral streams, can be affected by early brain injury.
Purpose of the Study:
- To investigate visual perception abilities in school-aged children born preterm.
- To determine the impact of periventricular brain damage on visual processing in preterm children.
- To differentiate the effects of brain damage on dorsal and ventral visual stream functions.
Main Methods:
- Tested 26 preterm children (born <34 weeks gestation), divided into groups with and without periventricular brain damage.
- Administered four visual stimuli assessing pure global motion, segregated translational motion, and form-defined static stimuli.
- Compared results with age-matched healthy term-born controls.
Main Results:
- Preterm children with brain damage exhibited significantly lower visual sensitivities across all tested stimuli compared to controls.
- Preterm children without brain damage showed deficits primarily in pure motion perception (dorsal stream function).
- Preterm children with brain lesions performed significantly worse on form-embedded stimuli (ventral stream function) than those without lesions.
Conclusions:
- Dorsal stream functions are impaired in preterm children regardless of brain damage.
- Ventral stream deficits are more strongly associated with the presence of periventricular brain damage in preterm children.
- These findings highlight distinct impacts of preterm birth and associated brain injury on visual processing pathways.
Abstract:
We tested 26 school-aged children born preterm at a gestational age below 34 weeks, 13 with and 13 without periventricular brain damage, with four different visual stimuli assessing perception of pure global motion (optic flow), with some form information (segregated translational motion) and form-defined static stimuli. Results were compared with a group of age-matched healthy term-born controls. Preterm children with brain damage showed significantly lower sensitivities relative to full-term controls in all four tests, whereas those without brain damage were significantly worse than controls only for the pure motion stimuli. Furthermore, when form information was embedded in the stimulus, preterm children with brain lesions scored significantly worse than those without lesions. These results suggest that in preterm children dorsal stream-related functions are impaired irrespective of the presence of brain damage, whereas deficits of the ventral stream are more related to the presence of periventricular brain damage.
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