Motion sickness (MS) usually occurs for a narrow band of frequencies of the imposed oscillation. It happens that this frequency band is close to that which are spontaneously produced by postural sway during natural stance. This study examined the relationship between reported susceptibility to motion sickness and postural control. The hypothesis is that the level of MS can be inferred from the ...

Although dual-task interference has previously been demonstrated to have a significant effect on postural control among individuals with Parkinson's disease, the impact of speech complexity on postural control has not been demonstrated using quantitative biomechanical measures. The postural stability of twelve participants with idiopathic Parkinson's disease and twelve healthy age-matched contr...

PURPOSE To challenge the validity of existing cognitive models of postural control, we recorded eye movements and postural sway during two visual tasks (a control free-viewing task and a difficult searching task), and two postural tasks (one static task in which the platform was maintained stable and a dynamic task in which the platform moved in a sway-referenced manner.) We expected these mode...

We explore the influence of a secondary cognitive task on concurrent postural control in dyslexic children. Seventeen children with dyslexia (DYS) were compared with thirteen non-dyslexic children (NDYS). Postural control was recorded in Standard Romberg (SR) and Tandem Romberg (TR) conditions while children, in separate sessions, have to fixate on a target and name simple objects appearing con...

Lightly touching a stable surface with one fingertip strongly stabilizes standing posture. The three main features of this phenomenon are fingertip contact forces maintained at levels too low to provide mechanical support, attenuation of postural sway relative to conditions without fingertip touch, and center of pressure (CP) lags changes in fingertip shear forces by approximately 250 ms. In th...

Deficient postural control is a main factor in motor disorders such as cerebral palsy (CP) and developmental coordination disorder (DCD)--disorders which from early childhood seriously interfere with the quality of life. The abnormalities in postural control might be due to deviations in the early development of the CNS or to insults in the preand perinatal period, leading to deficiencies in th...

During quiet standing, the human body sways in a stochastic manner. Here we apply the uctuation-dissipation theorem (FDT) to the human postural control system and show that the dynamic response of the postural control system to a weak mechanical perturbation can be predicted from the uctuations exhibited by the system under quasi-static conditions. We also show that the estimated correlation an...

BACKGROUND AND PURPOSE To analyze the postural behavior of standing stroke patients: (1) To differentiate between postural impairment attributable to the neurological condition (deficits attributable to the cerebral lesion) and postural impairment attributable to new mechanical constraints caused by body weight asymmetry; (2) To assess the involvement of each limb in the postural impairment; (3...

works for the control of body posture have been analyzed in considerable detail, including identification of main cell types and their interactions. Also, alterations in the activity of postural mechanisms caused by the vestibular deficit (e.g., Refs. 18, 27, 62, 63) or spinal cord injury (46) have been investigated to better understand the postural mechanisms per se and the process of recovery...

INTRODUCTION Progressive supranuclear palsy (PSP) is characterized by early postural instability and backward falls. The mechanisms underlying backward postural instability in PSP are not understood. The aim of this study was to test the hypothesis that postural instability in PSP is a result of dysfunction in the perception of postural verticality. METHODS We gathered posturography data on 1...