Direct Excitation
Direct Excitation - Related Videos
05:05
Assessing Corticospinal Excitability During Goal-Directed Reaching Behavior
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Cited by 1 •
2022
Reaching is a fundamental skill that allows humans to interact with the environment. Several studies have aimed to characterize reaching behavior using a variety of methodologies. This paper offers an open-source application of transcranial magnetic stimulation to assess the state of corticospinal excitability in humans during reaching task performance.
12:26
Functional Site-Directed Fluorometry in Native Cells to Study Skeletal Muscle Excitability
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Cited by 2 •
2023
Functional site-directed fluorometry is a method to study protein domain motions in real time. Modification of this technique for its application in native cells now allows the detection and tracking of single voltage-sensor motions from voltage-gated Ca2+ channels in murine isolated skeletal muscle fibers.
12:33
Corticospinal Excitability Modulation During Action Observation
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Cited by 22 •
2013
Single-pulse transcranial magnetic stimulation over the primary motor cortex, neuronavigation, and registration of electromyographic activity of hand muscles were used in this study to explore corticospinal excitability while participants were observing action sequences.
12:13
Assessing Primary Motor Cortex Excitability and Excitability Modulation by Pairing Transcranial Magnetic Stimulation with Electromyography
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2025
Here, we present a protocol outlining the methodology to assess primary motor cortex excitability and excitability modulation using transcranial magnetic stimulation (TMS) paired with electromyography (EMG).
07:42
Nerve Excitability Assessment in Chemotherapy-induced Neurotoxicity
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Cited by 28 •
2012
This abstract describes a novel method to assess the development of neurotoxicity in patients receiving chemotherapy treatment. While conventional assessment methods are limited in their ability to detect early changes in nerve function, nerve excitability techniques provide early identification of patients at risk of severe neurotoxicity and insight into pathophysiology.
FAQs
A stimulus first changes the membrane potential of the cell. This change can open ion channels, allowing membrane depolarization to develop. If the response reaches the conditions required for an action potential, a neuron can generate electrical signaling; in a muscle fiber, the resulting excitation can trigger contraction. The sequence connects stimulus application with measurable cellular activity.
Intrinsic membrane properties determine how a cell responds when stimulated at its own membrane. Examining these properties helps researchers relate the applied stimulus to changes in membrane potential, channel activation, and the production of an action potential or contraction. This analysis separates characteristics of the individual cell from influences introduced by surrounding synaptic networks.
Direct excitation tests the response of the stimulated cell or tissue without requiring an intermediary cell to relay the signal. By contrast, network-mediated activation reflects communication through synaptic connections and may include effects from multiple cells. Comparing these conditions allows researchers to determine whether an observed response arises from intrinsic cellular behavior or circuit-level signaling.
In neurons, the approach can reveal how membrane changes lead to action-potential generation. In muscle fibers, it can link electrical activation with contraction. These outcomes provide complementary information about excitable tissues, while the stimulus-response relationship helps characterize how biological cells translate an applied electrical, chemical, or physical input into functional activity.
In electrophysiology, researchers apply a stimulus to the cell or tissue and examine the resulting membrane response. They can then relate the input to membrane-potential changes, ion-channel involvement, and whether an action potential occurs. This workflow supports characterization of intrinsic membrane properties and distinguishes the cell's own response from activity transmitted through synaptic pathways.
Neural stimulation studies can use direct excitation to examine how neurons respond when the stimulus reaches the cells themselves. The resulting activity helps investigators evaluate stimulus-response relationships and identify whether activation reflects intrinsic neuronal behavior rather than synaptic network effects. This makes the approach useful for analyzing cellular contributions within broader biological circuits.
Although the stimulus acts on a selected cell or tissue, the observed response can be compared with responses produced through synaptic networks. That comparison helps identify which features belong to the stimulated element and which depend on circuit connections. Consequently, direct excitation supports studies of how intrinsic cellular properties contribute to the organization and function of biological circuits.