Interhemispheric Inhibitory Interactions
Condition: Stroke
MeSH terms: Stroke
Study type: Interventional

Summary: 
      After a stroke the excitability of the brain decreases on the stroke side and increases on
      the opposite, non-stroke side. These changes make use of the stroke-affected arm difficult
      and slow recovery. Rehabilitation exercises that increase arm use after stroke help increase
      brain excitability, but the net effect of this approach is low. New therapies are needed that
      restore more equal levels of brain excitability between the two sides. Brain stimulation is a
      noninvasive way to affect activity the excitability of brain cells. Pairing brain stimulation
      with exercises that require patients to learn new movements may help the brain to learn.
      Using stimulation that reduces activity in the side opposite to the stroke can increase
      activity on the stroke -affected side, through connections between the two brain hemispheres.
      The purpose of this study is to test if brain stimulation on the side opposite to the stroke,
      paired with arm movement exercises, can help patients learn new arm movements and improve arm
      function.

      In this study people with stroke will receive brain stimulation over two different areas on
      the side of the brain opposite to the stroke: 1) those areas responsible for movement and 2)
      those responsible for sensation. These experiments will test both the short and long term
      effects of brain stimulation on patients' learning and arm function and will allow us to
      identify which area of the brain best improves learning and arm function. These experiments
      have the potential to improve the effectiveness of rehabilitation after stroke. The proposed
      study is among the first to test stimulation over the side of the brain opposite to the
      stroke damage and at multiple sites. This unique approach may help stimulate the development
      of new methods for stroke rehabilitation.
    

Detailed description: 
      The overall objective of this proposal is to examine the efficacy of new approaches to stroke
      recovery based on recent reports of interhemispheric contributions to neuroplastic change and
      motor skill learning. After stroke, cortical excitability is decreased in the ipsilesional
      and increased in the contralesional primary motor cortices (M1). Combined, these changes
      hamper hemiparetic arm use and impede functional recovery. Increasing hemiparetic arm use
      elevates the excitability of the ipsilesional cortex and improves function. Importantly,
      skilled motor practice raises cortical excitability to an even greater extent than merely
      increasing generalized use. However, the impact of increasing cortical excitability on
      recovery of function after stroke is limited, perhaps because the rate of change associated
      with both increasing use and learning new motor skills is low.

      Repetitive transcranial magnetic stimulation (rTMS) is a noninvasive method of brain
      stimulation. In humans, rTMS applied at high frequencies can increase cortical excitability;
      conversely, at low frequencies it can decrease cortical excitability. While rTMS in isolation
      can change cortical excitability after stroke its impact on neuroplastic change is small,
      likely reflecting a lack of consolidation in the absence of paired motor behaviour.
      Modulating the activity in a given neural network with brain stimulation prior to motor skill
      practice may in essence prime the system and enhance the neuroplastic effects associated with
      learning new motor skills. Yet to date, few studies have paired rTMS with practice of a novel
      motor task and assessed changes in motor function or behaviour.

      Intuitively, it seems simplest to employ high frequency rTMS in the ipsilesional cortex to
      enhance cortical excitability. However, because of the difficulty of locating stimulation
      targets in the damaged hemisphere, low-frequency rTMS applied over the contralesional cortex
      may be the better approach. Though the direct effect of low-frequency rTMS in the human
      cortex is to suppress activity in the stimulated region it also indirectly enhances distant
      activity. Low-frequency rTMS over M1 increases cortical activity in the contralateral M1
      homologue. We recently extended this finding to the primary sensory cortex (S1);
      demonstrating that low-frequency rTMS over left S1 increased excitability in (i.e.,
      disinhibited) right S1. Therefore, suppressing the contralesional cortex to enhance
      ipsilesional cortical activity may facilitate a neural environment that is conducive for
      neuroplastic change.

      Taken together these data suggest that inhibitory brain stimulation over the contralesional
      cortex, paired with skilled motor practice, may offer a new approach for stroke
      rehabilitation. To better understand whether this approach has merit, we propose to test two
      specific aims in separate experiments.

      Specific Aim: To test the cumulative effects of repeated sessions that pair brain stimulation
      over M1c versus S1c with skilled motor practice in individuals with stroke.

      We will assess hemiparetic arm motor and sensory function, motor performance/ motor skill
      acquisition (repeated sequence response times), cortical excitability, and neuroelectric
      activity in individuals with chronic sub-cortical stroke. Pre-brain stimulation measures will
      be compared with those obtained after 5 days of training paired with brain stimulation at a
      separate no-rTMS retention test to assess the cumulative effects of brain stimulation.
    

Intervention name(s): continuous theta burst stimulation
Intervention type(s): Other
Intervention description(s): 80% active motor threshold, 600 pulses
Other intervention name(s): transcranial magnetic stimulation
Allocation: Randomized
Intervention model: Parallel Assignment
Masking: Double (Participant, Outcomes Assessor)
Primary purpose: Treatment
Keywords: Stroke; TMS; Paired Pulse; EEG; Motor Learning