An experiment was aimed at testing flexor reflex in a spinal frog, which was initiated by simultaneous stimulation with isolated pre-threshold electrical impulses. The frequency of those impulses was such, that the reflex occurred. What process in the nerve centers can be observed during this experiment?

Answer options

1. Temporal summation
2. Presynaptic summation
3. Threshold summation
4. Postsynaptic summation
5. Spatial summation

Explanation

An experiment was aimed at testing flexor reflex in a spinal frog, which was initiated by simultaneous stimulation with isolated pre-threshold electrical impulses. The frequency of those impulses was such, that the reflex occurred. What process in the nerve centers can be observed during this experiment?Single pre-threshold impulses cannot stimulate the flow of action potentials but when transmitted from multiple sources or at high frequencies, they add up to produce a Threshold Impulse capable of producing action potentials in a phenomenon called Summation. There are 2 types of Summation, Spatial (with multiple sources) and Temporal (single or isolated source, repeatedly at a high frequency). Note the words we have made bold.