The effect of stimulation rate on the signal-to-noise ratio of evoked responses.
The signal-to-noise ratio (SNR) in averaged evoked responses is proportional to the signal amplitude and to the square root of the stimulation frequency. If the SNR-stimulation-rate dependence is known for some specified component or feature of the response it is possible to select a rate that maximizes the SNR of that component within a given measurement time. The same stimulation rate also minimizes the acquisition time for a given SNR.
Ahlfors
S P
SP
Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland.
Ilmoniemi
R J
RJ
Portin
K
K
D005071:Evoked Potentials / Q000502:physiology*; D006801:Humans; D015225:Magnetoencephalography; D008433:Mathematics; D010812:Physical Stimulation; D011930:Reaction Time / Q000502:physiology; D013997:Time Factors