A dual-task study of interference between mental activity and control of balance.
ABSTRACT This study aimed to examine interference between mental activity and control of balance.
In a mixed design, dual-task study, the performance of patients and healthy control subjects was compared on computerized dynamic posturography, on a visuospatial mental task, and when performing the mental task while balancing.
The study was performed at a tertiary referral outpatient neuro-otology clinic.
The patient group comprised 24 patients seen consecutively at the clinic because of vertigo and dizziness. The control group consisted of 24 subjects with no complaint or medical history of dizziness or balance disorder, matched with the patients for age and gender.
Performance on a visuospatial mental task and on the computerized dynamic posturography test (conditions 4 and 5) was measured.
Balancing on the posturography test resulted in a deterioration in performance on the mental task for both patients and control subjects. The effect was more marked when subjects had their eyes closed. Results on the balance test showed that normal subjects and patients with normal balance also swayed more when performing the mental task, whereas patients who had failed the posturography test swayed less when performing the mental task.
These results show that mental performance deteriorates when performing a demanding balance task. In addition, in both normal subjects and patients, balance also may be affected by mental activity in complex and varied ways that merit further investigation.
- SourceAvailable from: onlinelibrary.wiley.com
Article: Dynamics of cognition[Show abstract] [Hide abstract]
ABSTRACT: The application of dynamical systems methods and concepts to cognitive phenomena has broadened the range of testable hypotheses and theoretical narratives available to cognitive scientists. Most research in cognitive dynamics tests the degree to which observed cognitive performance is consistent with one or another core phenomena associated with complex dynamical systems, such as tests for phase transitions, coupling among processes, or scaling laws. Early applications of dynamical systems theory to perceptual-motor performance and developmental psychology paved the way for more recent applications of dynamical systems analyses, models, and theoretical concepts in areas such as learning, memory, speech perception, decision making, problem solving, and reading, among others. Reviews of the empirical results of both foundational and contemporary cognitive dynamics are provided. WIREs Cogn Sci 2012. doi: 10.1002/wcs.1200 For further resources related to this article, please visit the WIREs website.Wiley interdisciplinary reviews. Cognitive science 11/2012; 3(6). · 0.79 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: The current study uses a longitudinal within-subjects design to investigate the effects of wind-induced tall building motion on occupant wellbeing and work performance. 47 office workers on high floors of wind-sensitive buildings and 53 control participants completed 1909 surveys across 8 months and over a range of wind conditions. The results show that the effects of building motion are emergent, as motion sickness develops after a duration of exposure to motion, which mostly manifest as symptoms of sopite syndrome, or low-dose motion sickness (tiredness, low motivation, distraction from work activities, and low mood), which occur at 2–3 times baseline rates. As motion sickness increases, work performance significantly decreases by 0.76–0.90 standard deviations below baseline. Affected individuals attempt to manage their own discomfort, and indicate a preference to work a different location during motion, take 30–40% longer breaks, and attempt to self-medicate using analgesics. Humans are adaptable, allowing most occupants to continue their work activities, but at reduced levels of performance and comfort. Design criteria for tall buildings should attempt to minimise the environmental stress of building motion on work performance and wellbeing rather than motion tolerance or formal complaint to building owners.Journal of Wind Engineering and Industrial Aerodynamics 01/2014; 133:39-51. · 1.34 Impact Factor
- Parkinsonism & Related Disorders 02/2010; 16. · 3.27 Impact Factor