transduction

Transduction is the process of converting one form of energy, stimulus, or signal into another. It is a basic idea in biology, medicine, engineering, and physics, and the exact meaning depends on the field.

In biology, it often describes the way living systems turn outside input into signals the body or a cell can use. Your eyes change light into electrical nerve signals, your ears change sound waves into nerve signals, and your taste buds change chemicals in food into signals that help create taste. In cell biology, signal transduction is the chain of events by which a cell receives a signal, such as a hormone or other chemical message, and turns it into a response inside the cell.

In engineering, the word is used for devices that convert one kind of energy or signal into another. A microphone changes sound into an electrical signal. A speaker does the reverse and changes an electrical signal into sound. Sensors in general often work by transduction, because they take something in the physical world, such as light, pressure, or heat, and turn it into a form a machine can measure or use.

The word can also appear in more specific areas. In genetics, transduction can mean the transfer of genetic material from one bacterium to another by a virus. In vision science, phototransduction means the conversion of light into electrical signals in the retina.

So the central idea stays the same across different uses: something is received in one form and converted into another form that a body, cell, or device can act on.