Short-interval Intracortical Inhibition
Short-interval Intracortical Inhibition - Related Videos
09:48
Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
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Cited by 21 •
2017
Using two different transcranial magnetic stimulation (TMS) protocols, this manuscript describes how to measure and compare cortical inhibition within the primary motor cortex when adopting different attentional foci.
09:19
Short Session High Intensity Interval Training and Treadmill Assessment in Aged Mice
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Cited by 15 •
2019
Short session (≤10 min) high intensity interval training (HIIT) is emerging as an alternative to longer exercise modalities, yet the shorter variants are rarely modeled in animal studies. Here, we describe a 10 min, 3 day a week, uphill treadmill HIIT protocol that enhances physical performance in male and female aged mice.
01:03
Prediction Intervals
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2023
The interval estimate of any variable is known as the prediction interval. It helps decide if a point estimate is dependable. However, the point estimate is most likely not the exact value of the population parameter, but close to it. After calculating point estimates, we construct interval estimates, called confidence intervals or prediction intervals. This prediction interval comprises a range of values unlike the point estimate and is a better predictor of the observed sample value, y. The...
08:38
Habituation and Prepulse Inhibition of Acoustic Startle in Rodents
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Cited by 164 •
2011
Habituation and prepulse inhibition of startle are operational measures of sensory gating. Sensory gating is disrupted in schizophrenia, and some other mental disorders and neurodegenerative diseases. We here describe a standard protocol to assess short-term and long-term habituation as well as prepulse inhibition of acoustic startle responses in rats and mice.
01:21
Confidence Intervals
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2023
An unbiased point estimate is often insufficient to predict a population estimate, such as population mean or population proportion. In this scenario, a confidence interval is used. A confidence interval is an estimate similar to a sample proportion. However, unlike the point estimate which is a single value, the confidence interval contains a range of values. These values have lower and upper limits, known as confidence limits, and can be designated as L1 and L2, respectively. A confidence...
FAQs
The brief interval allows the subthreshold conditioning pulse to influence cortical circuitry immediately before the suprathreshold test pulse. This timing is important because the conditioning stimulus can recruit inhibitory interneurons before the test stimulus produces a motor-evoked potential. Changing the interval therefore changes how effectively local inhibitory activity can shape the measured motor response.
SICI primarily reflects the contribution of GABAergic inhibitory mechanisms within the motor cortex. The conditioning pulse engages local inhibitory interneurons, and their activity reduces the response produced by the subsequent test pulse. This makes the measure useful for studying how cellular-level inhibition contributes to cortical excitability and the regulation of motor output.
The key outcome is the motor-evoked potential generated after the paired stimuli. When the conditioning pulse produces stronger inhibition, the response to the test pulse is reduced more substantially; weaker inhibition permits a larger response. Comparing these effects across behavioral states can therefore reveal modulation of local inhibitory control rather than only overall motor-cortex responsiveness.
A typical measurement delivers two magnetic stimuli to the motor cortex: first, a subthreshold conditioning pulse, followed approximately 1–5 milliseconds later by a suprathreshold test pulse. The resulting motor-evoked potential provides the observable outcome. Researchers can then examine how the paired stimulation reflects inhibitory control under the behavioral condition being studied.
The measure is useful when researchers want to connect local motor-cortical inhibition with behavior. It can be assessed during movement, motor-learning paradigms, or other behavioral tasks to determine whether inhibitory control changes as participants act or learn. These comparisons help relate modulation of cortical networks to changes in motor performance and behavioral regulation.
SICI provides a way to characterize alterations in inhibitory control within the motor cortex in neurological and psychiatric conditions. By examining how the motor-evoked response is suppressed by paired stimulation, researchers can investigate condition-associated changes in cortical excitability and inhibition. The measure therefore links clinical or behavioral differences with a specific feature of local cortical network function.