Leg Action Threshold
Leg Action Threshold - Related Videos
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Cited by 18 •
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A method is described in which 3-4 month old infants learn a task by discovery and their leg movements are captured to quantify the learning process.
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Using TMS to Measure Motor Excitability During Action Observation
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Source: Laboratories of Jonas T. Kaplan and Sarah I. Gimbel—University of Southern California Transcranial Magnetic Stimulation (TMS) is a non-invasive brain stimulation technique that involves passing current through an insulated coil placed against the scalp. A brief magnetic field is created by current in the coil, and because of the physical process of induction, this leads to a current in the nearby neural tissue. Depending on the duration, frequency, and magnitude of these magnetic...
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01:23
Muscles that Move the Leg
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The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh. Anterior Compartment The quadriceps femoris, the most visible muscle of the anterior compartment, is integral for leg extension and thigh flexion. It is formed by merging four distinct muscles — the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris. The quadriceps tendon, a shared tendon of the four quadriceps muscles, is affixed to...
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Corticospinal Excitability Modulation During Action Observation
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FAQs
Leg action threshold reflects how sensory inputs are combined within neural circuits and translated into motor commands. A movement begins only after excitation reaches the level needed to activate leg muscles. This relationship connects the strength of stimulation with circuit-level control of an observable behavioral response.
Comparing thresholds can reveal changes in behavioral responsiveness, sensory sensitivity, arousal, or motor control. A shift in the amount of stimulation needed to produce movement indicates that the relationship between input and response has changed. Researchers can therefore examine effects associated with environmental conditions, development, injury, or experimental treatment.
The threshold identifies whether stimulation is sufficient to initiate movement, whereas onset speed describes how quickly the response begins after that condition is reached. Recording both measures provides complementary information about behavioral responsiveness. Two subjects may show similar initiation thresholds but differ in the timing of their leg movements.
Researchers vary the intensity of a sensory or internal stimulus and record whether a detectable leg movement begins. The lowest stimulation level that produces the defined response is used to characterize the threshold. Recording how quickly movement starts at each level adds information about response timing without replacing the threshold measurement.
Thresholds can be measured under different environmental conditions, developmental stages, injury states, or experimental treatments, then compared using the same movement criterion. Such comparisons show whether the level of stimulation required for leg activation changes. The results help distinguish altered sensory responsiveness from broader changes in motor behavior or arousal.
These measurements provide a quantitative link between stimulation and detectable movement. They can be used to characterize motor control, sensory sensitivity, and arousal by examining both the required stimulus level and the resulting response timing. In behavior research, this makes subtle changes in responsiveness easier to compare across subjects or experimental conditions.