Behavioral correlates of hippocampal type 2 theta in the rat

@article{Sainsbury1987BehavioralCO,
  title={Behavioral correlates of hippocampal type 2 theta in the rat},
  author={Robert Sainsbury and Arnold J. Heynen and Christopher P. E. Montoya},
  journal={Physiology \& Behavior},
  year={1987},
  volume={39},
  pages={513-519}
}
Previous research has indicated that there are two types of theta activity which can be recorded from the hippocampus in most rodents. One type (type 1) of theta is correlated with voluntary movements while the second (type 2) occurs during immobility. A third waveform termed LIA (Large Amplitude Irregular Activity) occurs during more automatic behaviors, e.g., grooming, shivering or immobility. In the rabbit and guinea pig type 2 theta can readily be elicited in unrestrained animals. However… Expand
Sensitization and hippocampal type 2 theta in the rat
TLDR
Data was used to support the hypothesis that a state of arousal is a necessary precursor for the production of type 2 theta and inescapable shock when the temporal characteristics of the conditioning stimulus (CS) were varied. Expand
Immobility-related hippocampal theta activity in rats during reaction to novelty.
TLDR
The purpose of the present study was to investigate whether Type 2 theta may occur in rats encountering novelty, and to shed light on this issue rats were tested in a novelty test in which smell made up the novel aspect. Expand
Alpha2 modulation of type 1 and type 2 hippocampal theta in the freely moving rat
Abstract In order to determine the brain sites involved in the noradrenergic modulation of hippocampal theta, the alpha2 agonist detomidine was infused into one of three brain sites in the freelyExpand
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TLDR
Hippocampal theta activity results from activation in the ascending synchronizing system and is involved in the organization of motor behaviour, providing evidence that these neural systems are involved in signal processing relevant to movements underlying adaptive behaviour. Expand
Hippocampal theta oscillations are modulated by behaviour in the ferret but persist during both locomotion and immobility
TLDR
It is shown that theta oscillations occur during locomotion in both the ferret and rat, however during periods of immobility, theTA oscillations persisted in the ferrets, contrasting starkly with the switch to large irregular activity (LIA) in the rat. Expand
The lateral septum as a regulator of hippocampal theta oscillations and defensive behavior in rats.
TLDR
A novel role is revealed of the LS, especially its dorsal aspects, as an important gating mechanism for the expression of theta oscillations in the rodent hippocampus, and the fact that dLS-muscimol increased theta frequency while also reducing anxiety-like behaviors challenges the influential theta suppression model of anxiolysis. Expand
The effects of alpha2 agonists and antagonists on hippocampal theta activity in the freely moving rat
Abstract The alpha 2 agonists detomidine and xylazine were given to freely moving rats implanted with bilateral hippocampal recording electrodes. These alpha 2 agonists produced virtually continuousExpand
Behaviourally modulated hippocampal theta oscillations in the ferret persist during both locomotion and immobility
TLDR
It is shown that theta oscillations occur during locomotion in both ferrets and rats, however during periods of immobility, theTA oscillations persisted in the ferret, contrasting starkly with the switch to large irregular activity (LIA) in the rat. Expand
Hippocampal Theta: a Sensory-inhibition Theory of Function
  • R. Sainsbury
  • Medicine, Psychology
  • Neuroscience & Biobehavioral Reviews
  • 1998
TLDR
It is argued that the most parsimonious hypothesis relating theta to behavior is not the motor programming theory but a sensory-inhibition model. Expand
Alpha2-noradrenergic modulation of hippocampal theta activity
TLDR
The inhibitory effect of norepinephrine on hippocampal type 2 theta activity was found to be mediated by alpha 2-adrenergic receptors and was blocked by microinfusions of an alpha 2 antagonist (tolazoline), which indicates that the site of action was specific to the noradren allergic alpha 2 receptor. Expand
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References

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Guinea pigs were exposed to three high "arousal" situations that produced reliable trains of "Type 2" theta, and a stimulus which had not previously elicited Type 2 theta was presented a second time after a presentation of a stimuli which did elicit Type 1 theta. Expand
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TLDR
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