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Neurons, or neurons, in the brain process information by sending and receiving electrochemical signals. This signal is usually referred to as an "action potential" or "spike".

Neurons change their potential (voltage) in response to signals received from other surrounding cells. This can be viewed as an analogous process. However, when the potential of a neuron exceeds a certain threshold, an action potential is generated. This action potential has a certain size and shape and propagates to other neurons. This process can be viewed as digital.

That is, it is digital in the sense that a neuron has only two states: "firing" or "not firing. On the other hand, it is analog in the sense that the interval and timing of firing can take on continuous values.

Thus, the brain can process information very efficiently by combining analog and digital characteristics.