Figure 2: Experiment schematic adapted from Wenzel et al. [10]. (a) Expansion of the external acoustic meatus, retroauricular incision and positioning of the electrodes on the mastoids (M), vertex (V) and neutral (N). (b) Detailed view of the extended meatus with view of the tympanic membrane, the umbo (U) and the positioning of the laser fiber (F1). (c) Detailed view of the retroauricular incision with view of the tympanic membrane (T), the round window (RF) and the laser filament positioned towards the round window (F2) and the otic capsule (F3) [10].