. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SINGING MUSCLES IN A KATYDID 421 40 B. 20 ^ 0 0 10 20 40 cr UJ h- ? 20 O 0 40 20 0 10 20 0 10 20 BURST TO BURST INTERVAL (MSEC) FIGURE 10. Inter-burst interval distribution during early warm-up. Each histogram in- cludes 100 successive intervals measured from the onset of one burst to the onset of the following burst. The records chosen for analysis were ones in which the bursts appeared rather regular in a preliminary inspection. A portion of the original record from which D was obtained is shown in A. The muscles here are
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SINGING MUSCLES IN A KATYDID 421 40 B. 20 ^ 0 0 10 20 40 cr UJ h- ? 20 O 0 40 20 0 10 20 0 10 20 BURST TO BURST INTERVAL (MSEC) FIGURE 10. Inter-burst interval distribution during early warm-up. Each histogram in- cludes 100 successive intervals measured from the onset of one burst to the onset of the following burst. The records chosen for analysis were ones in which the bursts appeared rather regular in a preliminary inspection. A portion of the original record from which D was obtained is shown in A. The muscles here are the right tergosternal (upper), the right first tergocoxal (middle) and the left dorsal longitudinal (lower channel). Initially warm-up is intermittent with periods of muscle activity several seconds to a few minutes long separated by silent periods. Later the activity is not inter- rupted by significant pauses. Through most of warm-up the muscle action poten- tials occur in short bursts of two to four individual potentials, seen clearly in some records but tending to fuse in others. The interval between the onset of successive bursts is 10-30 msec. The bursts can occur quite regularly (Fig. 10). The bursts might be due to either individual motor units in each muscle firing in slight asynchrony or to multiple firing by the same population of units. The latter seems more likely. The intervals between successive peaks of a burst can be quite regular, suggesting repetitive firing. Further, simultaneous recordings from different mus- cles usually show exactly the same number and spacing of pulses in equivalent bursts, even when the recordings are made from muscles which are antagonists in singing. This similarity would require that each muscle has the same number of motor units which are activated in the same pattern if the separate peaks are due. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
