True about summation -

Ans. is 'c' i.e., Subthreshold stimuli are usedSummationo A subthreshold stimulus does not produce a response, but when more than one subthreshold stimuli are applied response is produced.o The application of two subthreshold stimuli may be sufficiently quickly, one by another (temporal summation) or two subthreshold stimuli together at diferent places (Spatial summation).o Summation is due summation of EPSP in synapses (at post-synaptic neuron).