Medications

Study shows hydroxychloroquine's harmful effects on heart rhythm

The malaria drug hydroxychloroquine, which has been promoted as a potential treatment for COVID-19, is known to have potentially serious effects on heart rhythms. Now, a team of researchers has used an optical mapping system ...

Genetics

Using electrical stimulus to regulate genes

This is how it works. A device containing insulin-producing cells and an electronic control unit is implanted in the body of a diabetic. As soon as the patient eats something and their blood sugar rises, they can use an app ...

Neuroscience

Mechanism behind upper motor degeneration revealed

Scientists from Northwestern Medicine and the University of Belgrade have pinpointed the electrophysiological mechanism behind upper motor neuron (UMN) disease, unlocking the door to potential treatments for amyotrophic lateral ...

Medical research

Changing how we think about warm perception

A team of neuroscientists at Max Delbrueck Center for Molecular Medicine in the Helmholtz Association (MDC) have made an unexpected discovery about the way mice perceive warming sensations. It's counterintuitive: cooling ...

Neuroscience

High-speed microscope captures fleeting brain signals

Electrical and chemical signals flash through our brains constantly as we move through the world, but it would take a high-speed camera and a window into the brain to capture their fleeting paths.

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Signal (electronics)

In the fields of communications, signal processing, and in electrical engineering more generally, a signal is any time-varying or spatial-varying quantity.

In the physical world, any quantity measurable through time or over space can be taken as a signal. Within a complex society, any set of human information or machine data can also be taken as a signal. Such information or machine data (for example, the dots on a screen, the ink making up text on a paper page, or the words now flowing into the reader's mind) must all be part of systems existing in the physical world – either living or non-living.

Despite the complexity of such systems, their outputs and inputs can often be represented as simple quantities measurable through time or across space. In the latter half of the 20th century, electrical engineering itself separated into several disciplines, specializing in the design and analysis of physical signals and systems, on the one hand, and in the functional behavior and conceptual structure of the complex human and machine systems, on the other. These engineering disciplines have led the way in the design, study, and implementation of systems that take advantage of signals as simple measurable quantities in order to facilitate the transmission, storage, and manipulation of information.

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