Figure 3. Rate histograms and crosscorrelogram of discharge in a pair of cat reticularis pontis oralis units recorded during REM sleep (top), compared with a pair of echidna reticularis pontis oralis units recorded during sleep (bottom). Crosscorrelograms of each pair computed at 50 msec binwidth are shown at right. Unit pairs in both the cat and echidna were recorded from adjacent microwires on a single bundle of 32 m microwires. While most cat and dog units fire synchronously and are crosscorrelated during REM sleep (12), none of the echidna unit pairs were crosscorrelated in sleep.
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