New study sheds light on how motor control develops
If you've ever watched a baby try to grab a toy, you know how awkward those first movements can be. Scientists at the University of Ottawa have taken a big step in identifying the neural changes behind motor control by observing zebrafish go from clumsy swimmers to graceful gliders.
A new study from the University of Ottawa sheds light on how motor control develops in young zebrafish. Scientists led by Stephanie Gaudreau, a postdoctoral researcher, observed zebrafish transform from clumsy swimmers to coordinated gliders through changes in neural activity. The research, published across three peer-reviewed journals, focuses on motoneurons - cells that connect the nervous system to muscles and initiate movement.
As zebrafish mature, the electrical currents inside these motoneurons shift in distinct and predictable ways. These shifts allow the fish to move from wild, jerky motions to smoother, more controlled ones. Stephanie Gaudreau used electrophysiology to record the electrical activity of individual nerve cells at different ages, linking changes in ion currents directly to improvements in movement.
The key finding is that specific electrical currents within motoneurons evolve during development, allowing the fish to adjust their movements as they get better at swimming. These insights could help explain how humans also develop better movement control after birth and identify which ion currents are most important for motor control.
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