Motor control development continues longer than previously believed

The development of fine motor control—the ability to use your fingertips to manipulate objects—takes longer than previously believed, and isn't entirely the result of brain development, according to a pair of complementary studies.

The research opens up the potential to use therapy to continue improving the motor control skills of children suffering from such as , a blanket term for central motor disorders that affects about 764,000 children and adults nationwide

"These findings show that it's not only possible but critical to continue or begin physical therapy in adolescence," said Francisco Valero-Cuevas, corresponding author of two studies on the matter – one appearing in the Journal of Neurophysiology and the other in the Journal of Neuroscience.

"We find we likely do not have a narrow window of opportunity in early childhood to improve manipulation skills, as previously believed, but rather developmental plasticity lasts much longer and provides opportunity throughout adolescence" he said. "This complements similarly exciting findings showing in adulthood and old age."

Researchers had previously been able to detect improvements in fine motor control of the hand only until around age eight to 10; however, Valero-Cuevas—a professor of biomedical engineering and of biokinesiology and physical therapy—invented a tool that allows for more of fine motor control.

The tool is simple – springs of varying stiffness and length set between plastic pads which he has patented. Motor skill is then determined by individual's ability to compress the increasingly awkward spring devices. Sudarshan Dayanidhi, during his PhD studies at USC with Valero-Cuevas, developed and applied clinically useful versions of this technology with great success.

With this new tool, and in collaboration with Åsa Hedberg and Hans Forssberg of the Astrid Lindgren Children's Hospital in Stockholm, they tested 130 children with typical development between four and 16 years of age, and demonstrated that even the 16-year-olds were continuing to hone their fine . Their findings will appear in the Journal of Neurophysiology on Oct. 1.

To further this study, Dayanidhi and Valero-Cuevas joined forces with Assistant Professor of biokinesiology and physical therapy Jason Kutch (also of USC), to explore if this longer developmental timeline for dexterity was tied not just to brain maturation, but also to muscular development.

It has long been thought that improved dexterity involved only and muscle growth– where muscles only got bigger and stronger, but did not add to dexterous skills since they are performed at low forces. The research by Dayanidhi, Kutch and Valero-Cuevas indicates otherwise.

"Combining our metrics of dexterity from Dayanidhi's PhD work, with novel and noninvasive measures of muscle contraction time developed by Prof. Kutch, we were able to show a previously unknown strong association between gains in dexterity with improvement in low force muscle contraction time," said Valero-Cuevas.

This second facet of the research showing how both dexterity and muscle function improve in children will appear in the Journal of Neuroscience on Sept. 18.

Related Stories

What gives us fingertip dexterity?

Jan 23, 2008

Quickly moving your fingertips to tap or press a surface is essential for everyday life to, say, pick up small objects, use a BlackBerry or an iPhone. But researchers at the University of Southern California say that this ...

The age from when children can hop on one leg

Feb 21, 2013

Motor development in children under five years of age can now be tested reliably: Together with colleagues from Lausanne, researchers from the University Children's Hospital Zurich and the University of Zurich have determined ...

Recommended for you

Team finds an off switch for pain

1 hour ago

In research published in the medical journal Brain, Saint Louis University researcher Daniela Salvemini, Ph.D. and colleagues within SLU, the National Institutes of Health (NIH) and other academic institutions have d ...

Brain researchers pinpoint gateway to human memory

3 hours ago

An international team led by researchers of the University of Magdeburg and the DZNE has successfully determined the location, where memories are generated with a level of precision never achieved before. ...

How various brain areas interact in decisions

5 hours ago

Our decisions can be pictured in the brain. Scientists at the University of Zurich were able to show in a recent study which areas are most active in decision making. Often the so-called prefrontal cortex ...

Researchers identify receptors activated by odors

7 hours ago

A group of physiologists led by University of Kentucky's Tim McClintock have identified the receptors activated by two odors using a new method that tracks responses to smells in live mice.

User comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.