Fig. 8. Downstroke amplitude (
) and angular velocity (
) of the wing as
determinants of tegula excitation. (Ai,ii) Two sample recordings from the
hindwing organ illustrate failures of the tegula during single wingbeat cycles
with incomplete downstroke movements. For each cycle shown, the values of
and are given. Wing position (top trace) and tegula activity
recorded extracellularly from nerve branch N1 (lower trace) are shown. The
shaded areas indicate tegula burst duration. (Bi) Excitation of the tegula
organs in relation to stroke amplitude. Data for each wing were pooled from
eight animals. For the hindwing (hw), no excitation of the tegula was observed
during strokes of less than 50° in amplitude; in the forewing (fw), the
tegula failed at amplitudes of less than 44° (illustrated by the shaded
area). (Bii) Excitation of the tegula organs in relation to the angular
velocity of the downstroke (same data set as above). In both pairs of wings,
the tegula organs were active at any given angular velocity within the range
of values investigated.
