title: Dorsal and ventral stream sensitivity in normal development and hemiplegia.
abstract: Form and motion coherence thresholds can provide comparable measures of global visual processing in the ventral and dorsal streams respectively. Normal development of thresholds was tested in 360 normally developing children aged 4-11 and in normal adults. The two tasks showed similar developmental trends, with some greater variability and a slight delay in motion coherence compared to form coherence performance, in reaching adult levels. To examine the proposal of dorsal stream vulnerability related to specific developmental disorders, we compared 24 children with hemiplegic cerebral palsy with the normally developing group. Hemiplegic children performed significantly worse than controls on the motion coherence task for their age, but not on the form coherence task; however, within this group no specific brain area was significantly associated with poor motion compared to form coherence performance. These results suggest that extrastriate mechanisms mediating these thresholds normally develop in parallel, but that the dorsal stream has a greater, general vulnerability to early neurological impairment.
authors: Visual Development Unit, Department of Psychology, University College London, Gower Street, London WC1E 6BT, UK.
authors: Alison
authors: A
authors: Gunn
authors: Elizabeth
authors: E
authors: Cory
authors: Janette
authors: J
authors: Atkinson
authors: Oliver
authors: O
authors: Braddick
authors: John
authors: J
authors: Wattam-Bell
authors: Andrea
authors: A
authors: Guzzetta
authors: Giovanni
authors: G
authors: Cioni
mesh_terms: D000328:Adult; D000375:Aging / Q000502:physiology; D002547:Cerebral Palsy / Q000150:complications / Q000473:pathology / Q000503:physiopathology; D002648:Child; D002675:Child, Preschool; D006429:Hemiplegia / Q000150:complications / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D010296:Parietal Lobe / Q000254:growth & development* / Q000502:physiology; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010468:Perceptual Disorders / Q000209:etiology / Q000473:pathology / Q000503:physiopathology; D012684:Sensory Thresholds / Q000502:physiology; D013702:Temporal Lobe / Q000254:growth & development* / Q000502:physiology; D014793:Visual Cortex / Q000254:growth & development* / Q000502:physiology; D014795:Visual Pathways / Q000254:growth & development* / Q000502:physiology