New research reveals competition between brainhemispheres during sleep nature
sleep , with origins in the midbrain. Antiphase activity between the two hemispheres has been identified in running rodents and during REM with fast rhythms in superficial retrosplenial cortex, but the mechanisms that underlie this relationship are unknown. The relative simplicity of the reptilian model may thus help to reveal not only some mechanisms of sleep, but also some of the functions of the claustrum and of the midbrain in sleep.
Finally, our data emphasize the value of investigating non-mammalian sleep. Comparing stages of sleep , electrophysiological waveforms or even brain areas across distant species can be difficult; indeed, the terminology of sleep originated with data from humans and cats, the phenomena to be compared are usually multiparametric and sleep is polymorphic even among mammals. Matches across species are thus often only partial.
Silicon probes were mounted on a Nanodrive and secured to a stereotactic adaptor for insertion. On the day after the surgery, probes were slowly lowered into the tissue . For Imc recordings, the probe was advanced in small steps over two to three days until the signal began to show the area-typical signature.
The brain was covered with Duragel followed by Vaseline, and the probes were secured with UV-hardening glue. After surgery, lizards were released from the stereotactic apparatus and left on a heating pad set to 30 °C until full recovery from anaesthesia.Two to three days before surgery, lizards were habituated to a sleep arena, which was itself placed in a 3 × 3 × 3-m electromagnetic-shielded room.
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