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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

Task-dependent activation of distinct fast and slow(er) motor pathways during motor imagery

Keller, Martin ; Taube, Wolfgang ; Lauber, Benedikt

In: Brain Stimulation, 2018, p. -

Background: Motor imagery and actual movements share overlapping activation of brain areas but little is known about task-specific activation of distinct motor pathways during mental simulation of movements. For real contractions, it was demonstrated that the slow(er) motor pathways are activated differently in ballistic compared to tonic contractions but it is unknown if this also holds true...

Université de Fribourg

Enhanced jump performance when providing augmented feedback compared to an external or internal focus of attention

Keller, Martin ; Lauber, Benedikt ; Gottschalk, Marius ; Taube, Wolfgang

In: Journal of Sports Sciences, 2015, vol. 33, no. 10, p. 1067–1075

Factors such as an external focus of attention (EF) and augmented feedback (AF) have been shown to improve performance. However, the efficacy of providing AF to enhance motor performance has never been compared with the effects of an EF or an internal focus of attention (IF). Therefore, the aim of the present study was to identify which of the three conditions (AF, EF or IF) leads to the...

Université de Fribourg

Ice skating promotes postural control in children

Keller, Martin ; Röttger, K. ; Taube, Wolfgang

In: Scandinavian Journal of Medicine & Science in Sports, 2014, vol. 24, no. 6, p. e456-461

High fall rates causing injury and enormous financial costs are reported for children. However, only few studies investigated the effects of balance training in children and these studies did not find enhanced balance performance in postural (transfer) tests. Consequently, it was previously speculated that classical balance training might not be stimulating enough for children to adequately...

Université de Fribourg

Surround inhibition can instantly be modulated by changing the attentional focus

Kuhn, Yves-Alain ; Keller, Martin ; Lauber, Benedikt ; Taube, Wolfgang

In: Scientific Reports, 2018, vol. 8, no. 1, p. 1085

To further investigate the mechanism of surround inhibition (SI) and to determine whether adopting different attentional strategies might have an impact on the modulation of SI, the effects of adopting an external (EF) or internal focus of attention (IF) on SI and motor performance were investigated. While performing an index flexion with either an EF or IF, transcranial magnetic stimulation...

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

Spinal reflex plasticity in response to alpine skiing in the elderly

Lauber, B. ; Keller, Martin ; Gollhofer, Albert ; Müller, E. ; Taube, Wolfgang

In: Scandinavian Journal of Medicine & Science in Sports, 2011, vol. 21, no. s1, p. 62–68

The present study was designed to assess the influence of 12 weeks (28.5±2.6 skiing days) of alpine skiing on spinal reflex plasticity, strength and postural control in senior citizens. Therefore, soleus H-reflexes and postural stability were measured during bipedal quiet and unstable stance in 22 (12 male and 10 female) elderly subjects aged 66.6±1 years. Furthermore, the maximal isometric...

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...

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

Surround inhibition in the primary motor cortex is task-specifically modulated in non-professional musicians but not in healthy controls during real piano playing

Márquez, Gonzalo ; Keller, Martin ; Lundbye-Jensen, Jesper ; Taube, Wolfgang

In: Neuroscience, 2018, vol. 373, p. 106–112

Research has indicated that at the onset of a finger movement, unwanted contractions of adjacent muscles are prevented by inhibiting the cortical areas representing these muscles. This so-called surround inhibition (SI) seems relevant for the performance of selective finger movements but may not be necessary for tasks involving functional coupling between different finger muscles. Therefore,...