The power of theta-, delta-, alpha-, beta-low rhythms of the dorsal hippocampus telemetrically recorded was studied on four dogs after 24 and 48-hours water or food deprivation, after satisfaction of thirst and hunger as well as in choice between two different reinforcements (dried crust, water). A direct dependence between the strength of motivational state and the power of theta-rhythm has been found. In animals' behaviour two regimes of activity were singled out: stationary regime and transitory one. In the stationary regime, repetition of similar behavioural acts was attended by gradual increase in the power of theta-rhythm in the intervals between the signals. In case of changes from one behavioural form to the other (transitory regime) a selective sharp decline in the theta-rhythm power was observed.

Animals↗

PubMedDate not supplied

[The perception of an odogen is proportional to the activity of the autonomous nervous system in man].

Women aged 18-26 characterized according to R. M. Baevskiĭ's cardiointervalometric criteria by the balance between sympathetic and parasympathetic activities ("normotonicity") participated in the experiments. Sniffing subthreshold concentrations of cordiamin solution vapour during 7-9 s was revealed to increase activity of the sympathetic nervous system and heart rate frequency with a decrease of its variability. Normotonic subjects with predominance of the parasympathetic activity were found to have lower thresholds of the odogen detection and to be more cardioreactive to the subthreshold odogen than the "normotonics" with slight predominance of the sympathetic activity.

Adolescent↗

PubMedDate not supplied

[The analyzers of smell and taste--the chemoreceptors of the nasopharynx and tongue, the nerves and structures of the CNS--characterize the chemical composition of gaseous and liquid stimuli and protect the body from harmful exposures].

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Central Nervous System↗

PubMedDate not supplied

[P. K. Anokhin: his physiological, general biological and philosophical ideas (on the centenary of his birth)].

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Biology↗

PubMedDate not supplied

[Rol' of the frontal lobe in synchronizing biopotentials in different regions of the dog brain].

The role of the frontal cortex in formation of neocortical systemic processes has been studied by the method of sign correlation of the summate electrical activity. A distant EEG synchronization in the temporal and occipital zones sets in following strychninization of F2 zones (but not of Prc2 zones) in anaesthetized dogs or in cerveau isolé preparations. In dogs with elaborated conditioned reflexes a statistically significant distant synchronization of the neocortical EEG sets in during the delay period only in case of well expressed motivation (of hunger in case of food reinforcement, and of thirst in case of water reinforcement). No distant conditioned EEG synchronization was revealed in lobectomised dogs. The role of the frontal cortex in the intracerebral integration is discussed which is necessary for achievement of the forthcoming signal activity.

Animals↗