Movement Control: How the Brain Responds to Unexpected Situations

Summary: Researchers report the motor cortex is only essential for motor control when movements are executed in response to unexpected sensory feedback.

Source: University of Basel.

Scientists have demonstrated that the motor cortex is necessary for the execution of corrective movements in response to unexpected changes of sensory input but not when the same movements are executed spontaneously. Signatures of differential neuronal usage in the cortex accompany these two phenomena. The study by researchers from the University of Basel’s Biozentrum and the Friedrich Miescher Institute for Biomedical Research (FMI) has recently been published in “Neuron”.

In mammals, movement is controlled by circuits spanning throughout the central nervous system from the cortex to the spinal cord. The role of motor cortex in the control of movement is still unclear.

In humans, lesions to motor cortex can result in a loss of voluntary control of movement. Building on the expertise of studying motor circuits and the control of movement of the laboratory of Prof. Silvia Arber (University of Basel/FMI) and the expertise in vivo physiology and cortical processing of the laboratory of Dr. Georg Keller (FMI), the authors teamed up to shed new light on the function of motor cortex.

Movement control in response to unexpected situations

The aim of the study was to test how and under which conditions motor cortex is required for movement control. The authors developed an assay in which they trained mice to navigate a virtual tunnel, a task requiring the adjustment of the heading direction by spontaneous turning on a spherical treadmill.

They also probed the response to unexpected changes in visual feedback that mice had to correct for – for example by suddenly shifting the direction the mouse is running in in the virtual environment. This allowed them to compare the same movements mice executed either spontaneously or as induced by unexpected changes to the visual feedback.

a person doing a handstand
Warning — unexpected sensory feedback can have devastating consequences if not adequately corrected. NeuroscienceNews.com image is credited to FMI.

The authors found that motor cortex is only necessary for movement control when movements are executed in response to unexpected sensory feedback.

Specific activity patterns in the motor cortex

Recording neuronal activity in motor cortex as mice corrected for unpredicted sensory perturbations, the authors found that the activity patterns observed during the resultant motor corrections were different from those when the mouse executed the same movement spontaneously. This is consistent with a role of motor cortex in the corrective motor response, where it is required to engage in triggering an appropriate movement in response to the unexpected event.

“We believe that these findings change the way we think about how motor cortex functions from a view that it ‘simply’ controls movement to a role in which motor cortex is needed for sensory-guided control of movement in instances where the sensory processing is also cortically dependent,” says Matthias Heindorf, first author and former PhD student in the Arber and Keller laboratory.

About this neuroscience research article

Source: Dr. Silvia Arber – University of Basel
Publisher: Organized by NeuroscienceNews.com.
Image Source: NeuroscienceNews.com image is credited to FMI.
Original Research: Open access research for “Mouse Motor Cortex Coordinates the Behavioral Response to Unpredicted Sensory Feedback” by Matthias Heindorf, Silvia Arber, and Georg B. Keller in Neuron. Published August 23 2018.
doi:10.1016/j.neuron.2018.07.046

Cite This NeuroscienceNews.com Article

[cbtabs][cbtab title=”MLA”]University of Basel”Movement Control: How the Brain Responds to Unexpected Situations.” NeuroscienceNews. NeuroscienceNews, 23 August 2018.
<https://neurosciencenews.com/movement-unexpected-situations-9733/>.[/cbtab][cbtab title=”APA”]University of Basel(2018, August 23). Movement Control: How the Brain Responds to Unexpected Situations. NeuroscienceNews. Retrieved August 23, 2018 from https://neurosciencenews.com/movement-unexpected-situations-9733/[/cbtab][cbtab title=”Chicago”]University of Basel”Movement Control: How the Brain Responds to Unexpected Situations.” https://neurosciencenews.com/movement-unexpected-situations-9733/ (accessed August 23, 2018).[/cbtab][/cbtabs]


Abstract

Mouse Motor Cortex Coordinates the Behavioral Response to Unpredicted Sensory Feedback

Motor cortex (M1) lesions result in motor impairments, yet how M1 contributes to the control of movement remains controversial. To investigate the role of M1 in sensory guided motor coordination, we trained mice to navigate a virtual corridor using a spherical treadmill. This task required directional adjustments through spontaneous turning, while unexpected visual offset perturbations prompted induced turning. We found that M1 is essential for execution and learning of this visually guided task. Turn-selective layer 2/3 and layer 5 pyramidal tract (PT) neuron activation was shaped differentially with learning but scaled linearly with turn acceleration during spontaneous turns. During induced turns, however, layer 2/3 neurons were activated independent of behavioral response, while PT neurons still encoded behavioral response magnitude. Our results are consistent with a role of M1 in the detection of sensory perturbations that result in deviations from intended motor state and the initiation of an appropriate corrective response.

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