Speaker
Description
In non-invasive brain stimulation (NIBS), electric fields are used to stimulate or modulate neuronal activity. To achieve the desired degree of stimulation, a certain level of induced field is required. Contact impedance between the electrodes and skin/tissue layers results in a voltage drop, which reduces the amount of current applied for a given excitation voltage. To address this, the impedance of the head of eight participants was measured, and an analytical model based on electrode geometry was developed. To capture the variance in the measured impedance, the 10th and 90th percentiles of the parameters of the best-fit model were computed to indicate the degree of variation that is to be expected. These results will serve as a guide in determining the required stimulation parameters, potentially enhancing the therapeutic outcomes of NIBS.
