 Temporal summation refers to successive excitatory stimuli on the same location of the postsynaptic neuron.Both types of summation are the result of adding together many excitatory potentials; the difference being whether the multiple stimuli are coming from different locations at the same time (spatial) or at different times from the same location (temporal).Summation has been referred to as a “neurotransmitter induced tug-of-war” between excitatory and inhibitory stimuli.