Further evidence for excitability changes in human primary motor cortex during ipsilateral voluntary contractions
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Acknowledgement
This study was supported by Research Projects Grant-in-Aid for Scientific Research number 16500380 (T.K.) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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2019, Neuroscience LettersCitation Excerpt :The present study aimed to investigate bilateral corticospinal excitability changes in the process of motor learning. Corticospinal excitability changes are caused due to the repetitive activity of the neural network [14], and ipsilateral corticospinal excitability increases with increasing contralateral corticospinal excitability [9]. Therefore, we hypothesized that contralateral and ipsilateral corticospinal excitability increases during the late stage of motor learning.
Corticospinal Excitability During Actual and Imaginary Motor Tasks of Varied Difficulty
2018, NeuroscienceCitation Excerpt :That is, corticospinal excitability of the contralateral hemisphere during motor imagery is associated with imagined force level and movement phase (Hashimoto and Rothwell, 1999; Mizuguchi et al., 2013). Moreover, corticospinal excitability of the ipsilateral hemisphere during motor imagery is also enhanced (Liang et al., 2008). Thus, we were further motivated to determine if the task difficulty-dependent modulation of corticospinal excitability persists even when motor tasks are imagined.
Effects of unilateral voluntary movement on motor imagery of the contralateral limb
2011, Clinical NeurophysiologyCitation Excerpt :Functional activation of the human motor cortex is associated with not only the contralateral but also the ipsilateral voluntary movements (Hess et al., 1986; Kim et al., 1993; Stinear et al., 2001; Ziemann and Hallett, 2001; Ghacibeh et al., 2007). Previous studies using transcranial magnetic stimulation (TMS) have reported that the motor evoked potential (MEP) of the contralateral resting muscle is enhanced by ipsilateral homonymous muscle contraction, with no excitability changes at the spinal level (Stedman et al., 1998; Muellbacher et al., 2000; Stinear et al., 2001; Liang et al., 2008). A release of intracortical inhibition, therefore, may contribute to the enhancement of the motor cortex excitability during ipsilateral voluntary movement (Liang et al., 2008), similar to those during contralateral voluntary movement (Ridding et al., 1995).