[Vestibular origin of phasic depression of spinal reflexes during rapid eye movements in desynchronized sleep].
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Animals↗
Biomedical subjects
A R Morrison
Publications and source records attributed to A R Morrison.
[Presynaptic inhibition of the monosynaptic spinal reflex pathway in physiological sleep].
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Animals↗
The amygdala: a critical modulator of sensory influence on sleep.
The influence of external stimuli and the memories of both unpleasant and pleasant conditions clearly can have a considerable impact on the quality of sleep. The amygdala, a structure that plays an important role in coding the emotional significance of stimuli and is heavily interconnected with brainstem nuclei known to be involved in sleep control, has received little attention from sleep researchers. We report on a series of studies, focusing on its central nucleus (Ace). Presence of serotonin (5-HT) in Ace caused a rapid change of state when injected in rapid- eye-movement sleep (REM) compared with non-REM (NREM) injections. A 5-HT antagonist released ponto-geniculo-occipital waves (PGO) into NREM. Stimuli conditioned by pairing with aversive stimuli in a fear-conditioning paradigm significantly increased sound-elicited PGO and reduced REM.
Amygdala↗
Spontaneous and evoked activities of interpositus nucleus neurons before and after lesion of the cerebellar cortex.
Spontaneous and evoked activities of nucleus interpositus neurons (IN) of the cerebellum were examined before and after cerebellar paravermal cortex lesions in cats anesthetized with alpha-chloralose. It was found that spontaneous activity increased dramatically following cortical ablation: before the lesion only 4% of cells encountered fired at a rate exceeding 80 impulses/sec., whereas up to 40% discharged at this rate postoperatively. Responses to paw stimulation were also altered: the initial excitation was lengthened from 8.5 to 15.8 msec; narrow; trough causing segmentation in this excitation, which seems to result from Purkinje cell inhibition, was absent; and the succeeding inhibitory period was reduced in duration by 50%. Also after the lesion there was a strong tendency for the neurons to discharge in bursts. It is suggested that changes in cell activity in the IN following cortical lesion unveil neural mechanisms of motor disturbances in lesioned cats.
Action Potentials↗