Fig. 4. The arista tip response in four male and four female flies. (A) Stimuli:
superimposed frequency spectra of the acoustic random-noise stimulus at the
position of the antenna during vibration measurements in eight animals and a
spectrum of the background noise (BN). (B) Data reliability: frequency spectra
of the coherence between the laser and the microphone signals during the same
eight vibration measurements. Coherence can range between 0 and 1, with a
value of 1 indicating the absence of unrelated noise. (C) Superimposed
magnitude responses of the eight arista tips examined (males, blue traces;
females, red traces). A response magnitude of unity
(
vib/air=1), where vib is the
vibration velocity and air is the particle velocity, means that
arista tip and air particles move at the same velocity. (D) Corresponding
phase responses. A phase angle of +90° means that vib leads
air by a quarter of an oscillation cycle.
