title: Role of the Frontal Cortex in Standing Postural Sway Tasks While Dual-Tasking: A Functional Near-Infrared Spectroscopy Study Examining Working Memory Capacity.
abstract: Posture control during a dual-task involves changing the distribution of attention resources between the cognitive and motor tasks and involves the frontal cortex working memory (WM). The present study aimed to better understand the impact of frontal lobe activity and WM capacity in postural control during a dual-task. High and low WM-span groups were compared using their reading span test scores. High and low WM capacity were compared based on cognitive and balance performance and hemoglobin oxygenation (oxyHb) levels during standing during single (S-S), standing during dual (S-D), one leg standing during single (O-S), and one leg standing during dual (O-D) tasks. For sway pass length, significant difference in only the O-D task was observed between both groups. oxyHb levels were markedly increased in the right dorsolateral prefrontal cortex and supplementary motor area in the high-span group during a dual-task. Therefore, WM capacity influenced the allocation of attentional resources and motor performance.
authors.affiliation: Department of Neurorehabilitation, Graduate School of Health Sciences, Kio University, 4-2-2 Umami-naka, Koryo-cho, Kitakatsuragi-gun, Nara 635-0832, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Fujita
authors.affiliation: Department of Physical Therapy, Osaka Yukioka College of Health Science, Osaka, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Kasubuchi
authors.affiliation: Neurorehabilitation Research Center, Kio University, Nara 635-0832, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Wakata
authors.affiliation: Neurorehabilitation Research Center, Kio University, Nara 635-0832, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Hiyamizu
authors.affiliation: Neurorehabilitation Research Center, Kio University, Nara 635-0832, Japan.
authors.forename: Shu
authors.initials: S
authors.lastname: Morioka
mesh_terms: D000328:Adult; D001288:Attention / Q000502:physiology; D003071:Cognition / Q000502:physiology; D005260:Female; D005625:Frontal Lobe / Q000502:physiology*; D006801:Humans; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology*; D004856:Postural Balance / Q000502:physiology; D011187:Posture / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D019265:Spectroscopy, Near-Infrared