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Temporal correlation of responses in blood pressure and motor reaction under electrical stimulation of limbic structures in unanaesthetized, unrestrained cats

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Summary

The experiments were performed on 28 unanaesthetized, unrestrained cats of both sexes weighing 2.5–3.5 kg. For the operations pentobarbital anaesthesia (40 mg/kg) was used.

  1. 1.

    Weak electrical stimulation of the basolateral area of the nucleus amygdalae and the septum causes a decrease in blood pressure without alteration of the EMG (registered from the dorsal cervical muscles).

  2. 2.

    Stimulation with medium intensity of these cerebral structures and of the nucleus amygdalae centralis evokes an isolated rise in blood pressure. The electrical threshold for the cardiovascular responses is lower than that for a behavioral reaction.

  3. 3.

    Stronger stimulation of three limbic areas causes a latent psycho-motor reaction, which follows the rise in blood pressure. The time intervals between the onset of stimulation and i) the rise in blood pressure and ii) the first motor reaction depend upon the stimulus intensities. This means the higher the intensities of stimulation the shorter the latencies.

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Authors and Affiliations

  1. Physiologisches Institut der Universität Heidelberg, Germany

    H. Heinemann, G. Stock & H. Schaefer

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  1. H. Heinemann
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  2. G. Stock
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  3. H. Schaefer
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Additional information

This research was supported by grants from the Deutsche Forschungsgemeinschaft with in the SFB 90 “Cardiovasculäres System”.

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Heinemann, H., Stock, G. & Schaefer, H. Temporal correlation of responses in blood pressure and motor reaction under electrical stimulation of limbic structures in unanaesthetized, unrestrained cats. Pflugers Arch. 343, 27–40 (1973). https://doi.org/10.1007/BF00586572

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  • DOI: https://doi.org/10.1007/BF00586572

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