Human Cortical Muscle Coherence Is Directly Related to Specific Motor Parameters

Kilner, James M.; Baker, Stuart N.; Salenius, Stephan; Hari, Riitta; Lemon, Roger

doi:10.1523/jneurosci.20-23-08838.2000

Cited by 374 publications

(402 citation statements)

References 42 publications

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“…This is the first study to show significant corticomuscular coherence in the alpha and gamma bands during a transition between two force targets. Previous studies that used a similar experimental paradigm generally failed to show significant coherence during the transition between force levels (Kilner et al, 2000;Baker et al, 1997;Witham et al, 2011). However, these studies used a slightly di↵erent task design, where participants had to slowly change their force output from target 1 to target 2 during a 2 s interval.…”

Section: Discussionmentioning

confidence: 99%

“…Although oscillations in both frequency bands are e↵ectively carried down the corticospinal tract (Baker et al, 2003), most studies using sustained contractions find that only beta-band oscillations are coherent between motor cortex and muscle activity Halliday et al, 1998;Baker et al, 1997;Gross et al, 2000). Corticomuscular beta-band coherence is most prominent during tonic muscle contractions and disappears during movement (Baker et al, 1997;Riddle and Baker, 2006;Kilner et al, 2000;Baker et al, 1999) and beta-band activity is enhanced when higher precision is required Kristeva-Feige et al, 2002;Witte et al, 2007;Gilbertson et al, 2005). These findings suggest that the beta-band activity is related to a mechanism that maintains the current sensorimotor state (Baker, 2007;Engel and Fries, 2010;Van Wijk et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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The reorganization of corticomuscular coherence during a transition between sensorimotor states

2014

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Recent research suggests that neural oscillations in di↵erent frequency bands support distinct and sometimes parallel processing streams in neural circuits. Studies of the neural dynamics of human motor control have primarily focused on oscillations in the beta band (15 30 Hz). During sustained muscle contractions, corticomuscular coherence is mainly present in the beta band, while coherence in the alpha (8 12 Hz) and gamma (30 80 Hz) bands has not been consistently found. Here we test the hypothesis that the frequency of corticomuscular coherence changes during transitions between sensorimotor states. Corticomuscular coherence was investigated in twelve participants making rapid transitions in force output between two targets. Corticomuscular coherence was present in the beta band during sustained contractions but vanished before movement onset, being replaced by transient synchronization in the alpha and gamma bands during dynamic force output. Analysis of the phase spectra suggested a time delay from muscle to cortex for alpha-band coherence, by contrast to a time delay from cortex to muscle for gamma-band coherence, indicating a↵erent and e↵erent corticospinal interactions respectively. Moreover, alpha and gamma -band coherence revealed distinct spatial topologies, suggesting di↵erent generative mechanisms. Coherence in the alpha and gamma bands was almost exclusively confined to trials showing a movement overshoot, suggesting a functional role related to error correction. We interpret the dual-band synchronization in the alpha and gamma bands as parallel streams of corticospinal processing involved in parsing prediction errors and generating new motor predictions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The reorganization of corticomuscular coherence during a transition between sensorimotor states

2014

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“…The coherence values used to calculate the STCP were z-transformed, as described by Kilner et al (2000), as follows:…”

Section: Methodsmentioning

confidence: 99%

Gamma Responses Correlate with Temporal Expectation in Monkey Primary Visual Cortex

Lima¹,

Singer²,

Neuenschwander³

2011

J. Neurosci.

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Gamma oscillations have been linked to selective attention. Here, we investigate the effects of expecting a behaviorally relevant event (a change in the fixation point) on the oscillatory patterning of the local field potential and spiking responses in V1. Three protocols were used. In the first protocol, fixation point change occurred at a fixed time point, enabling predictions on task timing. In the second, fixation point change occurred in trial blocks either early or late in the trial, allowing us to compare responses during epochs of low and high expectation. Finally, we used a cue to indicate the upcoming fixation point change. All protocols led to an increase in gamma oscillations associated with alpha suppression when the monkeys expected an event in time. These effects were spatially widespread, since comparable results were observed for both central and peripheral visual representations in V1. Our findings indicate that expectations associated with perceptual decisions, motor responses, or upcoming reward may have a strong effect on the primary visual cortex, causing global, spatially nonselective modulation of gamma activity.

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“…1A). We measured coherence during stance because the stance phase of walking can be considered quasistationary and coherence is known to be higher during the "hold" phase of a task compared with the "movement" phase (Kilner et al 2000). The period of co-activation, i.e., the EMG window, where coherence was measured was chosen as follows: a threshold crossing was determined for the knee angle (horizontal line in lower graph of Fig.…”

Section: Coherence Analysismentioning

confidence: 99%

Changes in Cortically Related Intermuscular Coherence Accompanying Improvements in Locomotor Skills in Incomplete Spinal Cord Injury

Norton

Gorassini

2006

Journal of Neurophysiology

147

133

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. Changes in cortically related intermuscular coherence accompanying improvements in locomotor skills in incomplete spinal cord injury. J Neurophysiol 95: 2580 -2589, 2006. First published January 11, 2006 doi:10.1152/jn.01289.2005. In human spinal cord injury, the neuronal mechanisms mediating the improvement of locomotor function in response to intensive treadmill training are not well understood. In this study, we examined if such recovery is mediated, in part, by increases in residual corticospinal drive to muscles of the leg during walking. To do this, we measured the coherence of electromyogram (EMG) activity between two antagonist muscles (intermuscular coherence), specifically at frequencies between 24 and 40 Hz, which is thought to indicate common drive to two muscles from corticospinal inputs. In 12 subjects with incomplete spinal cord injury, intermuscular coherence was measured between hamstrings and vastus lateralis EMG that was activated during walking on a motorized treadmill. Before training, appreciable coherence in the 24 -40 Hz frequency band was only present in subjects with moderate volitional motor strength in their leg muscles (n ϭ 8 subjects) compared with subjects with little or no leg muscle strength (n ϭ 4 subjects), reconfirming that 24 -40 Hz frequency coherence is likely mediated by common supraspinal inputs. After training, increases in 24 -40 Hz coherence only occurred in the eight subjects with moderate leg muscle strength who also exhibited improvements in locomotor recovery as assessed by the 21 point WISCI II scale (termed responders). In contrast, development of intermuscular coherence in the 24 -40 Hz frequency band did not occur in the four subjects with absent or weak muscle strength. These subjects also did not improve in their locomotor ability as reflected in unchanging WISCI II scores (termed nonresponders). Lower-frequency coherence (5-18 Hz), which is thought to contain common drive from spinal inputs, did not change in either group. In a subset of subjects that were previously assessed with transcranial magnetic stimulation (TMS) before and after training (n ϭ 5 responders and 3 nonresponders), there was a significant and positive relationship between increases in 24 -40 Hz coherence and increases in evoked muscle responses to TMS of the primary motor cortex. Taken together, increases in higher-frequency EMG coherence in subjects with residual voluntary muscle strength and its parallel relation to changes in TMS-evoked responses provides further evidence that improvements in locomotor function from treadmill training are mediated, in part, by increases in corticospinal drive to muscles of the leg during walking.

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Human Cortical Muscle Coherence Is Directly Related to Specific Motor Parameters

Cited by 374 publications

References 42 publications

The reorganization of corticomuscular coherence during a transition between sensorimotor states

The reorganization of corticomuscular coherence during a transition between sensorimotor states

Gamma Responses Correlate with Temporal Expectation in Monkey Primary Visual Cortex

Changes in Cortically Related Intermuscular Coherence Accompanying Improvements in Locomotor Skills in Incomplete Spinal Cord Injury

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