Electrical Signals
Electrical Signals - Related Videos
14:16
A New Application of the Electrical Penetration Graph (EPG) for Acquiring and Measuring Electrical Signals in Phloem Sieve Elements
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Cited by 24 •
2015
Electrical Penetration Graph (EPG) is a well-established technique for studying the feeding behavior of stylet-bearing insects. Here we show a new application of EPG as a non-invasive tool for the acquisition of intracellular electrophysiology recordings of sieve elements (SEs), the cells that form the phloem vasculature in plants.
04:06
Monitoring Electrical Signals from the Afferent Neurons in an Immobilized Zebrafish Larva
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2025
This video demonstrates the recording of electrical signals from the afferent neurons in a paralyzed zebrafish larva by positioning a micropipette near the lateral line ganglion and forming a loose seal for signal capture. The extracellular solution maintains neuronal viability during this process.
13:56
Modeling Biological Membranes with Circuit Boards and Measuring Electrical Signals in Axons: Student Laboratory Exercises
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Cited by 15 •
2011
This is a demonstration of how biological membranes can be understood using electrical models. We also demonstrate procedures for recording action potentials from the ventral nerve cord of the crayfish for student orientated laboratories.
06:50
Electric Potential
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Electric potential, also known as "voltage", measures the electric potential energy per unit charge. Electric field is a scalar quantity and is fundamental to many electrical effects. Like potential energy, what is physically meaningful is the difference in the electric potential. For example, the spatial variation in the electric potential is related to the electric...
04:53
Electrical Safety
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2023
Robert M. Rioux & Suprita Jharimune, Pennsylvania State University, University Park, PA Among the many hazards present in the laboratory, electrical hazards are one of the most common we must be cognizant of since most of the laboratory equipment we use requires electricity for operation. Improper handling or operation of electrical devices might lead to electric shock with the potential risk of injury or even death. Electric sparks can lead to fire or explosion (since many flammable...
FAQs
Threshold acts as the key decision point in neuronal signaling. A graded potential may change the membrane voltage without producing a traveling signal, but reaching threshold initiates a rapid action potential. This distinction allows neurons to convert changing voltage conditions into a more decisive signal that can travel along the axon and affect downstream communication.
Ion movement across the neuronal cell membrane changes voltage and produces the electrical conditions needed for signaling. These voltage changes can appear as graded potentials or, after threshold is reached, as rapid action potentials. The resulting sequence links membrane-level ion activity with signal transmission along the axon and communication at synapses.
An action potential traveling along the axon connects electrical activity in one part of a neuron with events at its synapses. When the signal reaches those sites, it can influence neurotransmitter release. This pathway matters because it provides a mechanism through which a voltage change can affect communication between neural cells and contribute to broader nervous-system activity.
Electroencephalography records coordinated electrical activity at the scalp. Its measurements therefore provide a way to study patterns of brain activity in relation to psychological or physiological states, rather than focusing only on the electrical event within one neuron. This makes the technique useful for examining how brain activity changes across cognitive and behavioral contexts.
Psychology researchers examine electrical signals to connect brain activity with perception, attention, emotion, learning, and behavior. Electroencephalography can record activity while participants experience psychological stimuli, allowing researchers to relate coordinated electrical responses to those processes. The approach supports investigation of how neural activity corresponds with observable changes in cognition and behavior.
Scalp recordings of coordinated electrical activity support research across several areas, including cognition, sleep, neurological conditions, and responses to psychological stimuli. In psychology, these recordings can complement questions about perception, attention, emotion, and learning. Their value comes from relating measured brain activity to specific mental processes, conditions, or behavioral responses under study.