Theta waves and behavioral manifestations of alertness and dreaming activity in the rat

Electro-oscillographic recordings show that when rats wake up, behavioral manifestations such as head dorsal extension and snout and eye movements (which occur in this sequence), occasionally followed by brief ear and limb twitches, are preceded by and are simultaneous with theta waves (around 6.5 H...

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Published inBrazilian journal of medical and biological research Vol. 25; no. 7; pp. 745 - 749
Main Authors VALLE, A. C, TIMO-IARIA, C, FRAGA, J. L, SAMESHIMA, K, YAMASHITA, R
Format Journal Article
LanguageEnglish
Published Ribeirão Preto Associação Brasileira de Divulgação Científica 1992
Subjects
Animals
Behavior, Animal - physiology
Biological and medical sciences
Cortical Synchronization
Dreams - physiology
Electromyography
Female
Male
Medical sciences
Neurology
Rats
Rats, Wistar
Theta Rhythm
Wakefulness - physiology
Electrodiagnosis
Vigilance
Vertebrata
Nervous system diseases
Mammalia
Sleep
Rat
Rodentia
Electroencephalography
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Summary:Electro-oscillographic recordings show that when rats wake up, behavioral manifestations such as head dorsal extension and snout and eye movements (which occur in this sequence), occasionally followed by brief ear and limb twitches, are preceded by and are simultaneous with theta waves (around 6.5 Hz in frequency) in neocortical areas 3 and 17 and in the hippocampus. Heart rate increases when the animal passes from synchronized sleep to relaxed wakefulness to exploratory behavior. During desynchronized sleep theta waves, similar to those found during alertness, usually precede and are simultaneous with rostrum and eye movements and brief ear and limb twitches. Heart rate also increases during dreaming activity. A high degree of coherence (near 1.0) was found among theta bursts in different hippocampal areas in both highly attentive alertness and dreaming. It is suggested that theta waves are related to attention as part of some kinds of behavior and of the process of dream shaping and expression, both characterized by consciousness.
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ISSN:0100-879X
1414-431X