title: Rapid On-Line Control to Reaching Is Preserved in Children With Congenital Spastic Hemiplegia: Evidence From Double-Step Reaching Performance.
abstract: This study aimed to investigate the integrity of on-line control of reaching in congenital spastic hemiplegia in light of disparate evidence. Twelve children with and without spastic hemiplegia (11-17 years old) completed a double-step reaching task requiring them to reach and touch a target that remained stationary for most trials (viz nonjump trial) but unexpectedly displaced laterally at movement onset for a minority of trials (20%: known as jump trials). Although children with spastic hemiplegia were generally slower than age-matched controls, they could account for target perturbation at age-appropriate levels shown by a lack of interaction effect on movement time and nonsignificant group difference for time to reach trajectory correction on jump trials. Our data suggest that at a group level, on-line control of reaching may be age-appropriate in spastic hemiplegia. However, our data also highlight the need to experimentally acknowledge the considerable heterogeneity of the spastic hemiplegia population when investigating motor cognition.
authors.affiliation: Cognitive Neuroscience Unit, School of Psychology, Deakin University, Melbourne, Victoria, Australia c.hyde@deakin.edu.au.
authors.forename: Christian
authors.initials: C
authors.lastname: Hyde
authors.affiliation: Cognitive Neuroscience Unit, School of Psychology, Deakin University, Melbourne, Victoria, Australia.
authors.forename: Ian
authors.initials: I
authors.lastname: Fuelscher
authors.affiliation: Cognitive Neuroscience Unit, School of Psychology, Deakin University, Melbourne, Victoria, Australia.
authors.forename: Peter G
authors.initials: PG
authors.lastname: Enticott
authors.affiliation: Murdoch Children's Research Institute, Melbourne, Australia.
authors.forename: Susan M
authors.initials: SM
authors.lastname: Reid
authors.affiliation: Murdoch Children's Research Institute, Melbourne, Australia College of Sport and Exercise Science, Victoria University, Melbourne, Victoria, Australia Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Victoria, Australia.
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Williams
mesh_terms: D000293:Adolescent; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D002648:Child; D005260:Female; D006429:Hemiplegia / Q000150:complications*; D006801:Humans; D008297:Male; D019957:Motor Skills Disorders / Q000209:etiology*; D009068:Movement / Q000502:physiology*; D009862:Online Systems; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D018709:Statistics, Nonparametric
keywords: motor imagery; on-line control of reaching; spastic hemiplegia