. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. E. 80 T. c. GG-GH (suck) 300 T â MH^^fif^^ I I I I I I I I I I I M I I I 40 0 +40 ms STH-OMO (drink) '^°i4Ww»w^^ 1111111111111111 40 0 +40 ms I Figure 3. Cross-correlations between signals detected by different pairs of electrodes in one animal. Abbreviations used: DIG, digastric; GH, geniohyoid; HYOG, hyoglossus; STYLO, styloglossus; GG, genioglossus; OMO, omohyoid; STH, sternohyoid. The horizontal axis indicates time shift relative to zero time shift (fg). Examples of cross-correlations that were commonly found in
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. E. 80 T. c. GG-GH (suck) 300 T â MH^^fif^^ I I I I I I I I I I I M I I I 40 0 +40 ms STH-OMO (drink) '^°i4Ww»w^^ 1111111111111111 40 0 +40 ms I Figure 3. Cross-correlations between signals detected by different pairs of electrodes in one animal. Abbreviations used: DIG, digastric; GH, geniohyoid; HYOG, hyoglossus; STYLO, styloglossus; GG, genioglossus; OMO, omohyoid; STH, sternohyoid. The horizontal axis indicates time shift relative to zero time shift (fg). Examples of cross-correlations that were commonly found in suckling are shown in (A), (B), and (C). Some evidence of short-term synchronization (elevation of central region ± 2 milli- seconds) in suckling is present in (D) and stronger evidence is present in (E). In (F), the activities in the same muscles as in (E) were recorded during drinking and were cross-correlated but with no sign of a central peak. providing the clearest evidence of the presence of synchronization. Before deahng with the significance of this finding, it is necessary to comment briefly on its vahdity. First, the results shown in Figure 3E indicate that the cross-correlation method used in this pa- per was intrinsically capable of detecting synchronization within the recorded EMG signals. However, motor neurons are acti- vated froin multiple sources within the central and peripheral nei'vous systems and not all the motor neurons supplying units in a given muscle are subject to the same neural influences. Consistent with this, some motor units have different tasks from others within the same muscle. If EMG activity is recorded with an intra-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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