Figure 8

PARADOXICAL SLEEP STRUCTURES evidently lie far back along the brainstem. A cat deprived of all its higher brain function by means of a cut through the pons (a) will live for months, alternately awake and in paradoxical sleep. If a cut is made lower (b) along the brainstem, however, the cat will no longer fall into paradoxical sleep, because the cut destroys the brain cells in that region, which produce another monoamine, noradrenalin.

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