The 1 millisecond duration was used to study which type of summation?

• A. Temporal summation
• B. Spatial summation
• C. Spectral summation
• D. Adaptation summation

Answer: (A)

Temporal integration of neural inputs is being tested. When a stimulus lasts only 1 millisecond, the key question is whether successive inputs can summate in time to produce a larger postsynaptic response. Temporal summation describes this exact process: combining rapid inputs within a brief time window so the membrane potential can reach threshold even if a single input is subthreshold. The very short duration is chosen to focus on how inputs add up over time rather than across space or across wavelengths, which would point to other phenomena. So using a 1 ms duration is a classic way to probe temporal summation.