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fMRI evidence for dorsal stream processing abnormality in adults born preterm
Thierry Chaminade1, Russia Ha-Vinh Leutcher, Véronique Millet
1Institut de Neurosciences de la Timone, CNRS, Aix-Marseille Université, Marseille, France. tchamina@gmail.com
Brain and Cognition
|November 24, 2012
Summary
Premature birth impacts visual processing, with adults born prematurely (Premas) relying more on basic visual data than controls. This suggests Premas inadequately use higher-order functions for dorsal stream tasks.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Visual Neuroscience
Background:
- Premature birth can affect brain development and function.
- The dorsal stream is crucial for visual processing, including action and spatial awareness.
Purpose of the Study:
- To investigate the effects of premature birth on the functional neuroanatomy of the dorsal stream of visual processing.
- To compare brain activity during object and grip processing between adults born prematurely and matched controls.
Main Methods:
- fMRI scans were recorded from 16 healthy adults (8 born prematurely, 8 controls).
- Participants performed a 1-back memory task involving object or grip information.
- Regions of interest included occipital, temporal, and parietal lobes.
Main Results:
- Task performance was not significantly affected by prematurity history.
- Object processing activated ventral stream regions similarly in both groups.
- Grip processing revealed differences: controls focused on action goals, while premature individuals relied on lower-level visual information.
Conclusions:
- Prematurity may lead to a shift towards lower-order visual processing in the dorsal stream.
- Adults born prematurely might not adequately recruit higher-order visual functions for dorsal stream tasks.
