My rudimentary understanding of the neuronal firing rate is that it varies person to person, and neuron to neuron. So any specific number for a firing rate would be specific to the test subject and type of neuron etc. However aside from this I'm interested to find out if any medication or specific dietary constituents have been shown to increase neuronal firing rate in average test subjects. To be clear I understand that some medication has been shown to help suffers of diseases such as Alzheimer's, but I'm interested in the typical human brain. 
Can the neuronal firing rate be increased through medication/diet?
neurobiology;measurement;feeding;psychopharmacology