Fig. 7. Bamboo shark audiogram plotted in terms of (A) acceleration, (B) velocity and (C) displacement. These results support the proposal that the macula neglecta is a velocity detector, as there is a substantially flat response in terms of particle velocity irrespective of the change in frequency (B). For a velocity sensitive organ, if the thresholds are plotted in terms of acceleration (A) there is an increase in threshold with increase in frequency (approximately 6 dB per octave) and a decrease in threshold with increase in frequency when expressed in terms of particle displacement (C).