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Fig. 7. Body pressure changes in response to adduction and retraction. (A) Pressure
changes were measured at the base of the subcoxa in segment A4 (upper trace)
while monitoring the separation of the prolegs in all body segments (lower
traces). An upward deflection indicates an increase in pressure and retraction
of the prolegs. Proleg movements tend to occur concurrently in different body
segments. The pressure scale bar corresponds to 980 Pa (10 cmH2O).
(B) The first 9 s of data for the pressure and prolegs in A5 are shown on an
expanded scale. The magnitude of the pressure trace has been rescaled to
demonstrate the close relationship between pressure changes and proleg
movements. (C) A cross-correlation plot of movements and pressure change in
A5. A peak at the dotted line would indicate exact coincidence of movement and
pressure. Here, the peak lags behind, showing that the pressure pulse precedes
the proleg movement by 200 ms. This correlation is very similar for the other
prolegs at the start of the recording but the relationship breaks down
completely for the rest of the recording (see text).
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