Fig. 12
From: Experimental observation of gray whale skull vibrations amplified in the bony hearing complex

Frequency response ratios between 150–1000 Hz obtained in air with vibrations excited by a shaker at different points on the plastic juvenile skull. In all cases, the skull was resting ventral-side up, but the skull had a tilt to the right when driven at its rostrum. Legend indicates excitation location (OC = occipital condyles). (a) Ratio of left bulla to skull mediolateral velocity. (b) Ratio of right bulla to skull mediolateral velocity. (c) Ratio of left bulla to skull anteroposterior velocity. (d) Ratio of right bulla to skull anteroposterior velocity.