Activity on a neuron that when it returns facilitates future activity on that neuron

Activity on a neuron that when it returns facilitates future activity on that neuron

• A. Positive feedback
• B. Negative feedback
• C. Stimulus
• D. Threshold

Answer: (A)

Positive feedback in neural signaling is when the activity of a neuron makes it more likely to fire again in the near future. After a neuron fires, mechanisms such as depolarization that persists or recurrent excitatory connections can feed back to enhance the neuron's excitability, creating a self-reinforcing loop. This means the initial activity facilitates future activity on that same neuron, which is exactly what positive feedback describes. Negative feedback would do the opposite—dampen or terminate activity to keep things from escalating. A stimulus is simply input that can start activity, but it doesn’t inherently promote continued firing. Threshold is the level needed to trigger an action potential, not a self-reinforcing process.

Positive feedback in neural signaling is when the activity of a neuron makes it more likely to fire again in the near future. After a neuron fires, mechanisms such as depolarization that persists or recurrent excitatory connections can feed back to enhance the neuron's excitability, creating a self-reinforcing loop. This means the initial activity facilitates future activity on that same neuron, which is exactly what positive feedback describes.

Negative feedback would do the opposite—dampen or terminate activity to keep things from escalating. A stimulus is simply input that can start activity, but it doesn’t inherently promote continued firing. Threshold is the level needed to trigger an action potential, not a self-reinforcing process.