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Fig. 5. Power-spectra for antennal and leg movements in a searching cockroach. (A)
Spectra for horizontal (H) and vertical (V) deflections in pausing. Their
major peaks were distributed mainly at <3 Hz (H) and <4 Hz (V),
respectively. (B) Power-spectra for antennal (H and V) and foreleg (L)
movements in walking. Lower frequency components at <2 Hz were largely
suppressed for horizontal deflections (H). Higher frequency components around
4 Hz became remarkable for vertical deflections (V) instead. Note that no
conspicuous peak is observable in the H and V spectra at the frequency
corresponding to major peaks in the L spectrum (2–3.5 Hz). Inset in each
spectrum is part of the time course before FFT. These spectra were obtained
from data for a 31 s period each.
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