What is the time between two spikes called, and how do you turn it into a frequency? · Lobeworks/17
The inter-spike interval, ISIn=tn+1−tn\mathrm{ISI}_n = t_{n+1} - t_nISIn=tn+1−tn, and its inverse is the instantaneous frequency, fn=1/ISInf_n = 1/\mathrm{ISI}_nfn=1/ISIn.
What is the time between two spikes called, and how do you turn it into a frequency?
The inter-spike interval, ISIn=tn+1−tn\mathrm{ISI}_n = t_{n+1} - t_nISIn=tn+1−tn, and its inverse is the instantaneous frequency, fn=1/ISInf_n = 1/\mathrm{ISI}_nfn=1/ISIn. Spikes 5 ms apart mean 1/0.005=2001/0.005 = 2001/0.005=200 Hz; 20 ms apart, 50 Hz. The interval can never be shorter than the absolute refractory period, about 1 ms, which caps any neuron near 1000 Hz.