Activity changes of the cat paraventricular hypothalamus during stressor exposure

Dorso-medial paraventricular hypothalamus (PVH) activity was assessed by light scattering procedures in freely behaving cats during auditory stressor exposure. Acoustic noise (> 95 dB) raised plasma ACTH concentrations, somatic muscle tonus, respiratory frequency and cardiac rates; PVH activity p...

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Veröffentlicht in:Neuroreport 2004-01, Vol.15 (1), p.43-48
Hauptverfasser: Kristensen, Morten P, Rector, David M, Poe, Gina R, Harper, Ronald M
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creator Kristensen, Morten P
Rector, David M
Poe, Gina R
Harper, Ronald M
description Dorso-medial paraventricular hypothalamus (PVH) activity was assessed by light scattering procedures in freely behaving cats during auditory stressor exposure. Acoustic noise (> 95 dB) raised plasma ACTH concentrations, somatic muscle tonus, respiratory frequency and cardiac rates; PVH activity peaked 0.8 s following stimulation, and then markedly declined below baseline to a trough at 9.7 s. Hypothalamic responses were not uniformly distributed across the recorded PVH field. Activity changes emerged from subregions within the visualized area, and were widespread at the overall activity zenith and nadir. Isolated pixels appeared opposite in activity pattern to overall changes. We suggest that transient activity increases represent initial PVH neural stress responses, and that subsequent profound declines result from neural inhibitory feedback.
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subjects Acoustic Stimulation - adverse effects
Adrenocorticotropic Hormone - blood
Animals
Biological and medical sciences
Cats
Electroencephalography - methods
Electromyography - methods
Female
Fundamental and applied biological sciences. Psychology
Heart Rate - physiology
Male
Paraventricular Hypothalamic Nucleus - physiology
Stress, Physiological - blood
Stress, Physiological - physiopathology
Vertebrates: nervous system and sense organs
title Activity changes of the cat paraventricular hypothalamus during stressor exposure
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