Fig. 7. (A) The frequency f₀ of the resonance measured at the arista tips of two males and two females as a function of the relative particle velocity of the random-noise stimuli (for corresponding absolute particle velocities, see Fig. 6A). f₀ increases linearly with stimulus intensity. (B) Intensity-dependent response magnitudes of two male and two female arista tips to pure-tone stimulation at different frequencies. The responses exhibit maxima at frequency-specific intensities. _vib/_air is the response magnitude, where _vib is the vibration velocity and _air is the particle velocity.