Hippocampal EEG and behavior: effects of variation in body temperature and relation of EEG to vibrissae movement, swimming and shivering

doi:10.1016/0031-9384(71)90172-7

Physiology & Behavior

Volume 6, Issue 4, April 1971, Pages 391-392, IN2, 393-397

https://doi.org/10.1016/0031-9384(71)90172-7 Get rights and content

Abstract

Hippocampal and neocortical EEG activity was examined in freely moving rats at normal rectal temperature and during artificial hypothermia and hyperthermia. Hippocampal rhythmical slow activity (RSA) and neocortical low voltage fast activity occurred during walking, jumping and swimming (voluntary movement), but irregular hippocampal activity and cortical spindling occurred during immobility and shivering (when it occurred in the absence of other movement). Movements of the vibrissae were not directly correlated with RSA. During voluntary movement, RSA frequency varied from 2 to 12 Hz over a temperature range of 23–42°C. RSA fell in amplitude only below about 26°C and disappeared entirely below 23°C. Simultaneously, voluntary movements also disappeared, but shivering persisted below 20°C. Neocortical spindle activity was not observed below about 30°C.

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Citation Excerpt :
It is unclear what direction and magnitude of body temperature change occurred at our low doses (0.25 and 0.5 g/kg), but doses at 1 and 2 g/kg used in the RPO paradigm would likely have resulted in mild hyperthermia. Relating to ethanol’s impact on thermoregulation, it is important to note that a decrease in body temperature is associated with a decrease in HPC theta frequency (Whishaw and Vanderwolf, 1971), and an increase in body temperature is likely to result in an increase (Andersen and Moser, 1995). In addition, ethanol’s effect on body temperature is also dependent on ambient room temperature (Kalant and Lê, 1983).
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Citation Excerpt :
To avoid sudden jerks of the animal head during the inter-trial period, the animal was carefully dried with a towel after each trial in the water maze. This procedure can also reduce the probable cooling associated with the training, since it has been reported that a reduction in core temperature (Whishaw and Vanderwolf, 1971) and long periods of swimming in cool water (22 c) before starting the training in the Morris maze modifies the theta frequency (Pan and McNaughton, 1997). The swimming path length and the swimming speed of the training tests were calculated using VideoBench software.
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^☆: This research was supported by a grant from the National Research Council (APB-118). The authors are indebted to B. Bland for assistance in performing some of the experiments.

²: Now at Department of Psychology, University of Lethbridge, Lethbridge, Alberta.

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Hippocampal EEG and behavior: effects of variation in body temperature and relation of EEG to vibrissae movement, swimming and shivering☆

Abstract

Physiol. Behav.

Electroenceph. clin. Neurophysiol.

Electroenceph. clin. Neurophysiol.

The effect of decreased body temperature on conditioned reflex activity in the rat

Physiologia bohemoslov.

Subcortical electrical activity in the golden hamster during arousal from hibernation

Electroenceph. clin. Neurophysiol.

Note on the nature of the motor discharge in shivering

Brain

Hippocampal electrical activity in arousal

J. Neurophysiol.

Rabbit EEG “theta” rhythm: Its anatomical source and relation to activity in single neurons

J. Neurophysiol.

An apparatus for detecting and monitoring movement

Am. J. Psychol.

Shivering

Physiol. Rev.

Effects of hippocampal lesions on maze learning and retention in rats

Expl Neurol.