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Université de Fribourg

Adopting an external focus of attention alters intracortical inhibition within the primary motor cortex

Kuhn, Yves-Alain ; Keller, Martin ; Ruffieux, Jan ; Taube, Wolfgang

In: Acta Physiologica, 2017, vol. 220, no. 2, p. 289–299

Although it is well established that an external (EF) compared to an internal (IF) or neutral focus of attention enhances motor performance, little is known about the underlying neural mechanisms. This study aimed to clarify whether the focus of attention influences not only motor performance but also activity of the primary motor cortex (M1) when executing identical fatiguing tasks of the...

Université de Fribourg

Neural correlates of maladaptive pain behavior in chronic neck pain - a single case control fMRI study

Beinert, Konstantin ; Mouthon, Audrey ; Keller, Martin ; Mouthon, Michael ; Annoni, Jean-Marie ; Taube, Wolfgang

In: Pain Physician, 2017, vol. 20, no. 1, p. E115–E125

Chronic neck pain patients display functional impairments like decreased range of motion, decreased strength, and reduced sensorimotor function. In patients without structural damage, the reason for the persistence of pain is not well understood. Therefore, it is assumed that in chronic pain states, memory processes play an important role. We have now detected and tested a patient that might...

Université de Fribourg

Age-related differences in corticospinal excitability during observation and motor imagery of balance tasks

Mouthon, Audrey A. ; Ruffieux, Jan ; Keller, Martin ; Taube, Wolfgang

In: Frontiers in Aging Neuroscience, 2016, vol. 8, p. -

Postural control declines across adult lifespan. Non-physical balance training has been suggested as an alternative to improve postural control in frail/immobilized elderly people. Previous studies showed that this kind of training can improve balance control in young and older adults. However, it is unclear whether the brain of young and older adults is activated differently during mental...

Université de Fribourg

Interhemispheric sensorimotor integration; an upper limb phenomenon?

Ruddy, Kathy L. ; Jaspers, Ellen ; Keller, Martin ; Wenderoth, Nicole

In: Neuroscience, 2016, vol. 333, p. 104–113

Somatosensory information from the limbs reaches the contralateral Primary Sensory Cortex (S1) with a delay of 23 ms for finger, and 40 ms for leg (somatosensory N20/N40). Upon arrival of this input in the cortex, motor evoked potentials (MEPs) elicited by Transcranial Magnetic Stimulation (TMS) are momentarily inhibited. This phenomenon is called ‘short latency afferent inhibition (SAI)’...

Université de Fribourg

Maximizing performance: augmented feedback, focus of attention, and/or reward?

Wälchli, Michael ; Ruffieux, Jan ; Bourquin, Yann ; Keller, Martin ; Taube, Wolfgang

In: Medicine & Science in Sports & Exercise, 2016, vol. 48, no. 4, p. 714–719

Different approaches like providing augmented feedback (aF), applying an external focus of attention (EF), or rewarding participants with money (RE) have been shown to instantly enhance motor performance. So far, these approaches have been tested either in separate studies or directly against each other. However, there is no study that combined aF, EF, and/or RE to test whether this provokes...

Université de Fribourg

Task-dependent changes of corticospinal excitability during observation and motor imagery of balance tasks

Mouthon, Audrey ; Ruffieux, Jean ; Wälchli, Michael ; Keller, Martin ; Taube, Wolfgang

In: Neuroscience, 2015, vol. 303, p. 535–543

Non-physical balance training has demonstrated to be efficient to improve postural control in young people. However, little is known about the potential to increase corticospinal excitability by mental simulation in lower leg muscles. Mental simulation of isolated, voluntary contractions of limb muscles increase corticospinal excitability but more automated tasks like walking seem to have no or...

Université de Fribourg

Brain activity during observation and motor imagery of different balance tasks: An fMRI study

Taube, Wolfgang ; Mouthon, Michael ; Leukel, Christian ; Hoogewoud, Henri-Marcel ; Annoni, Jean-Marie ; Keller, Martin

In: Cortex, 2015, vol. 64, p. 102–114

After immobilization, patients show impaired postural control and increased risk of falling. Therefore, loss of balance control should already be counteracted during immobilization. Previously, studies have demonstrated that both motor imagery (MI) and action observation (AO) can improve motor performance. The current study elaborated how the brain is activated during imagination and observation...

Université de Fribourg

Non-physical practice improves task performance in an unstable, perturbed environment: motor imagery and observational balance training

Taube, Wolfgang ; Lorch, Michael ; Zeiter, Sibylle ; Keller, Martin

In: Frontiers in Human Neuroscience, 2014, vol. 8, p. 972

For consciously performed motor tasks executed in a defined and constant way, both motor imagery (MI) and action observation (AO) have been shown to promote motor learning. It is not known whether these forms of non-physical training also improve motor actions when these actions have to be variably applied in an unstable and unpredictable environment. The present study therefore investigated the...

Université de Fribourg

Cross-limb interference during motor learning

Lauber, Benedikt ; Lundbye-Jensen, Jesper ; Keller, Martin ; Gollhofer, Albert ; Taube, Wolfgang ; Leukel, Christian

In: PLoS ONE, 2013, vol. 8, no. 12, p. e81038

It is well known that following skill learning, improvements in motor performance may transfer to the untrained contralateral limb. It is also well known that retention of a newly learned task A can be degraded when learning a competing task B that takes place directly after learning A. Here we investigate if this interference effect can also be observed in the limb contralateral to the trained...

Université de Fribourg

Specific interpretation of augmented feedback changes motor performance and cortical processing

Lauber, Benedikt ; Keller, Martin ; Leukel, Christian ; Gollhofer, Albert ; Taube, Wolfgang

In: Experimental Brain Research, 2013, p. -

It is well established that the presence of external feedback, also termed augmented feedback, can be used to improve performance of a motor task. The present study aimed to elucidate whether differential interpretation of the external feedback signal influences the time to task failure of a sustained submaximal contraction and modulates motor cortical activity. In Experiment 1, subjects had to...