What is frequency coding in neural communication?

What is frequency coding in neural communication?

• A. Information is encoded by the rate of action potentials (number per second).
• B. Information is encoded by amplitude of postsynaptic potentials.
• C. Information is encoded by synaptic vesicle size.
• D. Information is encoded by diffusion distance.

Answer: (A)

Frequency coding means information is carried by how often a neuron fires action potentials over a given time window—the firing rate. Since the spike amplitude is all-or-none and fairly uniform, the brain reads stimulus strength from the number of spikes per second: a weak input yields few spikes per second, a strong input yields more spikes per second. This rate provides a scalable measure of intensity that downstream neurons can interpret. The other ideas—varying the amplitude of postsynaptic potentials, changing vesicle size, or diffusion distance—don’t map onto how a single neuron's output rate encodes information, so they’re not the basis of frequency coding.

Frequency coding means information is carried by how often a neuron fires action potentials over a given time window—the firing rate. Since the spike amplitude is all-or-none and fairly uniform, the brain reads stimulus strength from the number of spikes per second: a weak input yields few spikes per second, a strong input yields more spikes per second. This rate provides a scalable measure of intensity that downstream neurons can interpret. The other ideas—varying the amplitude of postsynaptic potentials, changing vesicle size, or diffusion distance—don’t map onto how a single neuron's output rate encodes information, so they’re not the basis of frequency coding.