When multiple sub stimuli converge on one cell body simultaneously

When multiple sub stimuli converge on one cell body simultaneously

• A. Temporal summation
• B. Spatial summation
• C. Positive feedback
• D. Negative feedback

Answer: (B)

When several subthreshold signals arrive from different inputs at around the same time onto the neuron, their excitatory effects add up at the cell body and soma/dendrites. This spatial convergence summates the potentials across different synapses, making it more likely for the combined depolarization to reach the threshold at the axon hillock and trigger an action potential. Temporal summation, by contrast, involves rapid inputs from the same synapse adding up over time, not multiple inputs in space at once. Positive and negative feedback relate to regulatory processes, not how multiple inputs are integrated on a neuron.

When several subthreshold signals arrive from different inputs at around the same time onto the neuron, their excitatory effects add up at the cell body and soma/dendrites. This spatial convergence summates the potentials across different synapses, making it more likely for the combined depolarization to reach the threshold at the axon hillock and trigger an action potential. Temporal summation, by contrast, involves rapid inputs from the same synapse adding up over time, not multiple inputs in space at once. Positive and negative feedback relate to regulatory processes, not how multiple inputs are integrated on a neuron.