Fig. 8.

Time and use dependent increase in sensitivity of Ag/AgCl electrodes to motion artifacts. A: to simulate use and deplete the layer of deposited AgCl, a −80-μA current was applied to each electrode for the 4- to 5-h experimental duration. At ∼30-min intervals flow was stopped for ∼5 min as shown by the scale bar at the bottom. Data representative of n = 4. B: comparison of the average magnitude of offset in response to flow in the first and last 2 h of the experiment. Charge in Coulombs indicates the total charge passed to deplete the deposited AgCl under each experimental condition (calculated from current and time); n = 4 in each group.