Motor cortex excitability in attention-deficit hyperactivity disorder (ADHD): A systematic review and meta-analysis.
ADHD brains show weaker motor brakes, so build external stop-start cues into sessions.
01Research in Context
What this study did
The team pooled nine brain-stimulation studies. All used a quick magnetic pulse to the motor area.
They asked: do kids with ADHD show weaker brain brakes? They looked at three pulse signs.
What they found
Only one sign stood out. The short-inhibition signal was lower in ADHD than in typical kids.
Other signs looked the same. Resting threshold and silent period did not differ.
How this fits with other research
Masuda et al. (2019) looked at 14 studies that used repeated pulses as therapy. They say the method is safe and may slightly help attention. Riches et al. (2016) adds a reason: the motor brakes are already loose.
Pan et al. (2016) showed table-tennis lessons boost executive skills. Loose motor brakes may explain why movement-rich games help this group.
Efstratopoulou et al. (2012) found PE teachers can spot ADHD by watching motor quirks. G et al. gives a brain reason behind those visible quirks.
Why it matters
You now have a brain-based reason for why movement breaks work. If the motor cortex has weak brakes, kids need external structure to stop and start. Use clear start-stop signals, timers, or brisk motor tasks before seated work. These tactics align with what the brain data show.
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02At a glance
03Original abstract
BACKGROUND: The core characteristic of attention deficit hyperactivity disorder (ADHD) is a persistent pattern of inattention and/or hyperactivity-impulsivity that causes developmental or functional impairment. Observational studies have investigated neurophysiological features in individuals with ADHD using transcranial magnetic stimulation (TMS) to identify which intracortical mechanisms are associated with the symptoms. This systematic review aimed to assess the quality of these studies and present meta-analyses of the available neurophysiological measures. METHODS: This systematic review searched the PubMed, Scopus, Web of Science, with no date restrictions. The methodological quality of observational studies was assessed utilizing the Agency for Healthcare Research and Quality (AHRQ) criteria for observational studies. The analysis of the mean and standard deviation of the neurophysiological measurements was performed using the RevMan software version 5.0 for the meta-analyses of studies. RESULTS: Nine publications that met the inclusion criteria were evaluated. Most of the AHRQ criteria were satisfied, indicating the good quality of the studies. On comparing subjects with ADHD and controls, the forest plot profiles were similar in respect to the resting motor threshold (RMT), and silent period (SP) but a significant difference was found for short intracortical inhibition (SICI). CONCLUSION: This meta-analysis found reduced SICI in individuals with ADHD, when compared with controls. Given the small number of studies, it is important that further studies be conducted for a more robust conclusion to be formed.
Research in developmental disabilities, 2016 · doi:10.1016/j.ridd.2016.01.022