A biosensor is an analytical device made up of two elements in spatial proximity: a biological recognition element able to interact specifically with a target and a transducer able to convert the recognition event into a measurable signal.
It is an analytical device that converts a biological response into an electrical signal. London Southbank University says that this is a very general definition though. However, they also say that biosenors are used to determine the concentration of substances. The article I attached does a much better job than I ever could of describing its features and uses.
As nellieliz4 and mcoffey said, a bio-sensor will measure a biological response to something into an electrical signal that can be recorded and analyzed by a computer. Bio-sensors can measure things such as the firing of a neuron or the concentrations of hormones, neurotransmitters, or other substances in the body. Bio-sensors are especially useful in the field of psychology because they can tell us a lot about how our brains work. Here is a link to an article where bio-sensors are being employed to measure people’s emotions. A lie detector is also a type of bio-sensor.
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