Temporal summation refers to what?

Temporal summation refers to what?

• A. Addition of inputs from different synapses
• B. Addition of repeated inputs from the same single synapse
• C. Summation across multiple neurons
• D. Addition of repeated inputs from the same single synapse

Answer: (D)

Temporal summation is the additive effect that occurs when a neuron receives repeated inputs at the same synapse in rapid succession. Each input generates a postsynaptic potential, and if another input arrives before the first one has decayed, their effects overlap and combine, producing a larger depolarization. If enough inputs come in quickly enough, this summed depolarization can reach the threshold to trigger an action potential. This is different from summation across different synapses, which is spatial summation. The idea is that time-based convergence of signals at a single synapse can push the neuron past threshold even if individual inputs are weak.

Temporal summation is the additive effect that occurs when a neuron receives repeated inputs at the same synapse in rapid succession. Each input generates a postsynaptic potential, and if another input arrives before the first one has decayed, their effects overlap and combine, producing a larger depolarization. If enough inputs come in quickly enough, this summed depolarization can reach the threshold to trigger an action potential. This is different from summation across different synapses, which is spatial summation. The idea is that time-based convergence of signals at a single synapse can push the neuron past threshold even if individual inputs are weak.