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Related Experiment Videos

Midbrain adrenergic mechanisms modulating flight behaviour induced by hypothalamic stimulation

S Saha1, S K Manchanda, S C Bhatia

  • 1Department of Physiology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi.

Indian Journal of Physiology and Pharmacology
|April 1, 1993
PubMed
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Electrical stimulation in cats induced flight responses. Midbrain alpha-2 adrenoceptive mechanisms, modulated by norepinephrine and clonidine, were found to mediate this hypothalamically-driven behavior.

Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Neuropharmacology

Background:

  • The neural circuits underlying fear and flight responses are complex.
  • Electrical stimulation of specific brain regions can elicit goal-directed behaviors like flight.

Purpose of the Study:

  • To investigate the role of midbrain alpha-2 adrenoceptive mechanisms in hypothalamically induced flight responses in cats.

Main Methods:

  • Electrical stimulation of preoptic and lateral hypothalamic areas in cats to elicit flight.
  • Microinjections of norepinephrine, clonidine (alpha-2 agonist), and yohimbine (alpha-2 blocker) into the midbrain pretectal area.
  • Measurement of changes in current strength required to elicit flight response.

Main Results:

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  • Norepinephrine and clonidine significantly reduced the current strength needed for flight.
  • Yohimbine significantly increased the current strength needed for flight.
  • Control injections of saline and propylene glycol had no effect.

Conclusions:

  • Hypothalamically induced flight response in cats is mediated by alpha-2 adrenoceptive mechanisms in the midbrain.
  • This suggests a crucial role for these midbrain pathways in processing and executing fear-related behaviors.