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Effects of task and age on the magnitude and structure of force fluctuations: insights into underlying neuro-behavioral processes

Overview of attention for article published in BMC Neuroscience, March 2015
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Title
Effects of task and age on the magnitude and structure of force fluctuations: insights into underlying neuro-behavioral processes
Published in
BMC Neuroscience, March 2015
DOI 10.1186/s12868-015-0153-7
Pubmed ID
Authors

Solveig Vieluf, Jean-Jacques Temprado, Eric Berton, Viktor K Jirsa, Rita Sleimen-Malkoun

Abstract

The present study aimed at characterizing the effects of increasing (relative) force level and aging on isometric force control. To achieve this objective and to infer changes in the underlying control mechanisms, measures of information transmission, as well as magnitude and time-frequency structure of behavioral variability were applied to force-time-series. Older adults were found to be weaker, more variable, and less efficient than young participants. As a function of force level, efficiency followed an inverted-U shape in both groups, suggesting a similar organization of the force control system. The time-frequency structure of force output fluctuations was only significantly affected by task conditions. Specifically, a narrower spectral distribution with more long-range correlations and an inverted-U pattern of complexity changes were observed with increasing force level. Although not significant older participants displayed on average a less complex behavior for low and intermediate force levels. The changes in force signal's regularity presented a strong dependence on time-scales, which significantly interacted with age and condition. An inverted-U profile was only observed for the time-scale relevant to the sensorimotor control process. However, in both groups the peak was not aligned with the optimum of efficiency. Our results support the view that behavioral variability, in terms of magnitude and structure, has a functional meaning and affords non-invasive markers of the adaptations of the sensorimotor control system to various constraints. The measures of efficiency and variability ought to be considered as complementary since they convey specific information on the organization of control processes. The reported weak age effect on variability and complexity measures suggests that the behavioral expression of the loss of complexity hypothesis is not as straightforward as conventionally admitted. However, group differences did not completely vanish, which suggests that age differences can be more or less apparent depending on task properties and whether difficulty is scaled in relative or absolute terms.

Mendeley readers

The data shown below were compiled from readership statistics for 36 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 36 100%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 9 25%
Student > Master 7 19%
Researcher 6 17%
Student > Bachelor 3 8%
Professor > Associate Professor 3 8%
Other 5 14%
Unknown 3 8%
Readers by discipline Count As %
Neuroscience 8 22%
Medicine and Dentistry 6 17%
Psychology 5 14%
Sports and Recreations 3 8%
Agricultural and Biological Sciences 3 8%
Other 4 11%
Unknown 7 19%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 13 March 2015.
All research outputs
#4,071,906
of 4,866,634 outputs
Outputs from BMC Neuroscience
#566
of 671 outputs
Outputs of similar age
#121,691
of 146,261 outputs
Outputs of similar age from BMC Neuroscience
#12
of 14 outputs
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We're also able to compare this research output to 14 others from the same source and published within six weeks on either side of this one. This one is in the 1st percentile – i.e., 1% of its contemporaries scored the same or lower than it.