Which of the Following Statements About Summation in the Nervous

Question

Which of the following statements about summation in the nervous system is INCORRECT?
A) Summation of signals in neuronal pathways allows integration of multiple subthreshold changes in local potential.
B) Spatial summation occurs when local potentials originate from different locations on the posynaptic neuron.
C) Spatial summation also occurs when local potentials overlap in time.
D) Both spatial and temporal summation can lead to either inhibition or stimulation depending upon the signal type.
E) A single presynaptic action potential usually does not cause a sufficiently large postsynaptic local potential to cause the postsynaptic cell to reach threshold.

Accepted Answer

Spatial summation refers to the combination of signals that are received at different locations on the neuron's membrane, not to their timing. Temporal summation, on the other hand, involves signals that arrive at the same location but at different times.