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Results for “Reticular Formation”

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PubMed1978

[Deprivation of "rapid" sleep by stimulation of the reticular formation of rats].

Rats were repeatedly arused from REM sleep by the stimulation via implanted midbrain reticular electrodes. The 4-day seprivation reduced REM sleep by 50% whereas the slow-wave sleep was only reduced by 10%. There was no evidence of a disruption in the animal behaviour during the deprivation and no changes of emotional responsiveness in the "open-field" at the end of the deprivation. REM deprivation produced a slight but statistically significant (P = 0.025) adrenal weightlos. Thymus weight was unchanged and no stomach ulcers developed. Therefore the REM deprivation as such did not appear to produce stress in rats.

Adrenal Glands↗
PubMed1989

[The effect of stimulation of the substantia nigra on the low- and high-threshold neuronal responses of the reticular formation].

Modulation of somatosensory responses of bulbar (n. reticularis gigantocellularis) and pontine (n. reticularis pontis caudalis) reticular neurons by the substantia nigra (SN) stimulation was studied in cats under light chloralose anesthesia. It was found that the action of the SN stimulation on the somatosensory activity of the neurons was based on the principle of the inhibitory control of their high-threshold synaptic somatosensory inputs; high-threshold neuronal responses were much more depressed than the low-threshold ones in most (71%) of the studied reticular units. Possible neuromodulatory mechanisms and functional significance of described influences are discussed.

Animals↗
PubMed2004

Cardiovascular rhythms in the 0.15-Hz band: common origin of identical phenomena in man and dog in the reticular formation of the brain stem?

Selected examples from experiments in humans and dogs with time series of reticular neurons, respiration, arterial blood pressure and cutaneous forehead blood content fluctuations were analysed using multiscaled time-frequency distribution, post-event-scan and pointwise transinformation. We found in both experiments a "0.15-Hz rhythm" exhibiting periods of spindle waves (increasing and decreasing amplitudes), phase synchronized with respiration at 1:2 and 1:1 integer number ratios. At times of wave-epochs and n:m phase synchronization, the 0.15-Hz rhythm appeared in heart rate and arterial blood pressure. As phase synchronization of the 0.15-Hz rhythm with respiration was established at a 1:1 integer number ratio, all cardiovascular-respiratory oscillations were synchronized at 0.15 Hz. Analysis of a canine experiment supplied evidence that the emergence of the 0.15-Hz rhythm and n:m phase synchronization appears to result from a decline in the level of the general activity of the organism associated with a decline in the level of activity of reticular neurons in the lower brainstem network. These findings corroborate the notion of the 0.15-Hz rhythm as a marker of the "trophotropic mode of operation" first introduced by W.R. Hess.

Animals↗