Trigger Signals
Trigger Signals - Related Videos
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An efficient method to gain insights into visualizing the paracrine-derived ROS induction of endothelial Ca2+ signaling is described. This method takes advantage of measuring paracrine derived ROS triggered Ca2+ mobilization in vascular endothelial cells in a co-culture model.
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In this protocol, caged protein kinase A (PKA), a cellular signal transduction bioeffector, was immobilized on a nanoparticle surface, microinjected into the cytosol, and activated by the upconverted UV light from near-infrared (NIR) irradiation, inducing downstream stress fiber disintegration in the cytosol.
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Triggering a Closed-Loop Stimulation by Neuron Spiking Activity
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2025
This video demonstrates the operation of closed-loop stimulation in a rat with a surgically implanted device to record neural activity. Neuronal signals are first recorded and analyzed. Template waveforms are then uploaded, and parameters are defined to trigger closed-loop stimulation.
03:49
Real-Time Electroencephalography-Triggered Transcranial Magnetic Stimulation for Cortical Excitation
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Source: Stefanou, M., et.al. Brain State-dependent Brain Stimulation with Real-time Electroencephalography-Triggered Transcranial Magnetic Stimulation. J. Vis. Exp. (2019)This video demonstrates the process of real-time EEG-triggered transcranial magnetic stimulation (TMS) to study cortical excitability. The procedure involves positioning the TMS coil over the motor cortex, synchronizing stimulation with specific phases of the EEG signal, and recording motor-evoked potentials (MEPs) to explore...
09:58
RNAi Trigger Delivery into Anopheles gambiae Pupae
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RNA interference (RNAi) is an extremely valuable tool for uncovering gene function. However, the ability to target genes using RNAi during pre-adult stages is limited in the major human malaria vector Anopheles gambiae. We describe an RNAi protocol to reduce gene function via direct injection during pupal development.
FAQs
An initial stimulus changes the neuron's membrane potential, and the response begins when depolarization reaches threshold. At that point, voltage-gated ion channels generate an action potential, which travels along the axon and promotes neurotransmitter release at synapses. This sequence lets researchers connect an input with subsequent communication between neurons.
Threshold matters because it separates a membrane-potential change from the point at which voltage-gated ion channels generate an action potential. This gives the nervous system a defined condition for converting an input into a traveling axonal signal. Measuring responses relative to threshold can therefore clarify how stimuli become neural activity.
Voltage-gated ion channels are the key components that convert threshold-reaching depolarization into an action potential. Their opening links a change in membrane potential to a signal that travels along the axon. The resulting propagation promotes neurotransmitter release at synapses, allowing the original trigger to influence downstream neural communication.
Researchers can examine trigger signals by relating a sensory input to measured circuit activity and then to behavior. This design follows the signal across levels, from the initiating cue through neural processing to an observable outcome. It can help reveal how particular inputs engage circuits and how circuit activity corresponds with behavior.
This topic supports research on synaptic communication, neural coding, and reflexes because each area asks how an initiating input becomes organized neural activity or a physiological response. It also informs approaches that modulate brain activity, where understanding the trigger-to-response link helps frame what part of the nervous system is being influenced.
Abnormal triggering matters because it can contribute to neurological dysfunction, making the link between an initiating cue and its neural outcome a research target. Investigators can relate altered triggering to circuit activity, synaptic communication, and behavior. This approach helps place dysfunction within the broader sequence connecting input, neural activity, and physiological response.