Motor Threshold
Motor Threshold - Related Videos
06:48
The Staircase Procedure for Finding a Perceptual Threshold
0 Views •
2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Psychophysics is the name for a set of methods in perceptual psychology designed in order to relate the actual intensity of stimuli to their perceptual intensity. One important aspect of psychophysics involves the measurement of perceptual thresholds: How bright does a light need to be for a person to be able to detect it? How little pressure applied to the skin is detectable? How soft can a sound be and still be heard? Put...
05:45
Rapid Determination of the Thermal Nociceptive Threshold in Diabetic Rats
0 Views •
Cited by 10 •
2012
Here, we describe a rapid reliable and simple procedure to determine the lowest temperature at which rats or mice show nocifensive behavior, i.e. the thermal nociceptive threshold (TNT). This method applies a slowly increasing thermal stimulus allowing precise and reproducible estimation of TNTs with minimum, if any, stress to the animals.
09:29
DC Motors
0 Views •
2023
Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT. The DC machine operates with DC currents and voltages as opposed to an AC machine, which requires AC currents and voltages. DC machines were the first to be invented and utilize two magnetic fields that are controlled by DC currents. The same machine can be easily reconfigured to be a motor or generator if appropriate field excitation is available, since the DC machine has two fields termed field...
11:03
Motor Maps
0 Views •
2023
Source: Laboratories of Jonas T. Kaplan and Sarah I. Gimbel—University of Southern California One principle of brain organization is the topographic mapping of information. Especially in sensory and motor cortices, adjacent regions of the brain tend to represent information from adjacent parts of the body, resulting in maps of the body expressed on the surface of the brain. The primary sensory and motor maps in the brain surround a prominent sulcus known as the central sulcus. The cortex...
14:35
Using TMS to Measure Motor Excitability During Action Observation
0 Views •
2023
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...
FAQs
Resting and active motor thresholds represent different physiological states during stimulation. The resting measure is obtained when the target muscle is at rest, whereas the active measure is assessed while the muscle is engaged. Comparing them allows researchers to examine corticospinal excitability under separate conditions rather than treating neural responsiveness as fixed.
Motor Threshold provides a person-specific reference for adjusting stimulation intensity over the motor cortex. Instead of applying an identical intensity to every participant, researchers can relate the protocol to the level that produces a measurable motor response in that individual. This supports more consistent comparisons across people and experimental conditions.
The motor-evoked potential, or MEP, is the measurable muscle response used to identify whether stimulation has activated the targeted motor pathway. During threshold assessment, researchers gradually adjust stimulus intensity and observe the resulting MEPs. This response connects the applied TMS intensity with corticospinal excitability in the selected muscle.
A typical measurement begins by positioning stimulation over the motor cortex and selecting a target muscle for recording. Researchers then gradually adjust the TMS intensity while monitoring whether the stimulus produces a motor-evoked potential. The intensity associated with the required response is recorded, with resting or active muscle conditions specified for interpretation.
Researchers can use Motor Threshold to compare corticospinal excitability across individuals, experimental conditions, or stages of a study. These measurements provide a reference for examining changes associated with learning, injury, neurological disease, or therapeutic intervention. Because the measure is linked to a recorded muscle response, it can help track differences in motor-system responsiveness.
A change in Motor Threshold can serve as an indicator that corticospinal excitability differs across conditions or over time. In studies of learning, injury, neurological disease, or therapeutic intervention, researchers can compare threshold measurements to evaluate altered motor-system responsiveness. Interpretation depends on the specified physiological state, such as resting or active muscle conditions.