Abstract
The effect of chlorpromazine on the rate of habituation of phasic arousal responses has been studied in cats carrying permanently implanted cortical recording electrodes. In the sleeping animal repeated presentation of an auditory stimulus (1 sec duration, 3000 Hz) at intensities which only produced a localised, phasic electrocortical change in the auditory cortex, resulted in the rapid habituation of this latter response. Once habituation had occurred the intensity of the stimulus was increased until a similar change in electrocortical activity once again appeared in the auditory cortex. The habituation procedure was then repeated. In this way it was possible to habituate the animal gradually to successively higher intensities of auditory stimulation without ever inducing behavioural arousal or tonic, generalised changes in electrocortical activity. Indeed, it was possible to reach a level of stimulation which previously would have induced overt behavioural effects and tonic arousal. It may be concluded that alterations in the activity of the mechanisms responsible for phasic electrocortical responses leads to changes in the responsiveness of the animal even during sleep.
Following chlorpromazine phasic electrocortical responses were still elicited but their rate of habituation was significantly increased. Thus the overall effect of chlorpromazine was a marked shortening in the time taken to “train” the animal while still asleep, not to respond behaviourally or with tonic electrocortical changes to a particular auditory stimulus.
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Ader, W. R., Clink, D. W.: Effects of chlorpromazine on the acquisition and extinction of an avoidance response in rats. J. Pharmacol. exp. Ther. 121, 144–148 (1957)
Andén, N.-E., Dahlström, A., Fuxe, K., Hökfelt, T.: The effect of haloperidol and chlorpromazine on the amine levels of central monoamine neurones. Acta physiol. scand. 68, 419–420 (1966)
Andén, N.-E., Corrodi, H., Fuxe, K., Hökfelt, T.: Increased impulse flow in bulbospinal noradrenaline neurons produced by catecholamine receptor blocking agents. Europ. J. Pharmacol. 2, 59–64 (1967)
Arbuthnott, G. W., Christie, J. E., Crow, T. J., Eccleston, D., Walter, D. S.: Lesions of the locus ceruleus and noradrenaline metabolism in cerebral cortex. Exp. Neurol. 41, 411–417 (1973)
Barnes, C. D., Eltherington, L. G.: Drug dosage in laboratory animals. A handbook. Los Angeles: University of California Press 1965
Bartholini, G., Keller, H. H., Pletscher, A.: The effect of neuroleptics on endogenous norepinephrine in the rat. Neuropharmacology 12, 751–756 (1973)
Batini, C., Magni, F., Palestini, M., Rossi, G. F., Zanchetti, A.: Neural mechanisms underlying the induring EEG behavioural activation in the midpontine pretrigeminal cat. Arch. ital. Biol. 97, 13–25 (1959a)
Batini, C., Moruzzi, G., Palestini, M., Rossi, G. F., Zanchetti, A.: Effects of complete pontine transaction on the sleep-wakefulness rhythm: the midpontine pretrigeminal preparation. Arch. ital. Biol. 97, 1–12 (1959b)
Bolme, P., Fuxe, K., Lidbrink, P.: On the function of cerebral catecholamine neurones—their role in cardiovascular and arousal mechanisms. Res. Comm. Chem. Path. Pharmacol. 4, 657–697 (1972)
Bonvallet, M., Newman-Taylor, A.: Neurophysiological evidence for a differential organisation of the mesencephalic reticular formation. Electroenceph. clin. Neurophysiol. 22, 54–73 (1967)
Bradley, P. B., Elkes, J.: The effects of some drugs on the electrical activity of the brain. Brain 80, 77–117 (1957)
Bradley, P. B., Hance, A. J.: The effect of chlorpromazine and methopromazine on the electrical activity of the brain in the cat. Electroenceph. clin. Neurophysiol. 9, 191–215 (1957)
Bradley, P. B., Key, B. J.: The effect of drugs on arousal responses produced by electrical stimulation of the reticular formation of the brain. Electroenceph. clin. Neurophysiol. 10, 97–110 (1958)
Bradley, P. B., Key, B. J.: A comparative study of the effects of drugs on the arousal system of the brain. Brit. J. Pharmacol. 14, 340–349 (1959)
Carlsson, A., Lindquist, M.: Effect of chlorpromazine or haloperidol on formation of 3-meth-oxytyramine and normetanephrine in mouse brain. Acta pharmacol. (Kbh.) 20, 140–144 (1963)
Caspers, H. H., Grüter, H., Lerche, E.: über den Weckeffekt krackfreier Tonimpulse bei der nicht narkotisierten Ratte. Pflügers Arch. ges. Physiol. 267, 93–105 (1958a)
Caspers, H. H., Lerche, E., Grüter, H.: Adaptationserscheinungen der akustisch ausgelösten Weckreaktion bei Reizung mit defenierten Tonimpulsen. Pflügers Arch. ges. Physiol. 267, 128–141 (1958b)
Corrodi, H., Fuxe, K., Hökfelt, T.: The effect of neuroleptics on the activity of central catecholamine neurones. Life Sci. 6, 767–774 (1967)
Courvoisier, S., Fournal, J., Duerot, R., Kolsky, M., Koetschet, P.: Propriétés pharmacodynamiques du chlorohydrate de chloro-3-(diméthylamino-3-propyl)-10-phénothiazine (4560RP); étude expérimentale d'un nouveau corps utilisé dans l'anesthésie potentialisée et dans l'hibernation artificielle. Arch. int. Pharmacodyn. 92, 305–361 (1953)
Fuxe, K., Hökfelt, T.: Histochemical fluorescence detection of changes in central monoamine neurones provoked by drugs acting on the CNS. Triangle 10, 73–84 (1971)
Gastaut, H., Rogers, A.: Les mécanismes de l'activité nerveuse supérieure au niveau des grandes structures fonctionelles du cerveau. In: Moscow Colloquium on Electroencephalography of Higher Nervous Activities, H. H. Jasper and G. D. Smirnov, eds. Electroenceph. clin. Neurophysiol., Suppl. 13, 13–38 (1960)
Hartmann, E.: The biology of dreaming. Springfield, Ill.: Ch. C. Thomas 1965
Hishikawa, Y., Nakai, K., Ida, H., Kaneko, Z.: The effect of imipramine, desmethylimipramine and chlorpromazine on the sleep wakefulness cycle of the cat. Electroenceph. clin. Neurophysiol. 19, 518–521 (1965)
Jewett, R. E., Norton, S.: Effects of some stimulant and depressant drugs on sleep cycles of rats. Exp. Neurol. 15, 463–474 (1966)
Jones, B. E., Bobillier, P., Pin, C., Jouvet, M.: The effect of lesions of catecholamine-containing neurones upon monoamine content of the brain and EEG and behavioural waking in the cat. Brain Res. 58, 157–177 (1973)
Jouvet, M.: Mechanisms of the states of sleep. In: Sleep and altered states of consciousness, S. S. Kety, E. V. Evarts and H. C. Williams, eds., pp. 86–126. Baltimore: Williams and Wilkins 1967
Jouvet, M.: The role of monoamines and acetylcholine-containing neurones in the regulation of the sleep-waking cycle. Ergebn. Physiol. 64, 166–307 (1972)
Jus, A., Jus, C.: étude de l'extinction par répétition de l'expression EEG du réflexe d'orientation et de l'action du frein externe sur les réactions EEG aux différents stimuli chez l'homme. In: Moscow Colloquium on Electroencephalography of Higher Nervous Activities, H. H. Jasper and G. D. Smirnov, eds. Electroenceph. clin. Neurophysiol., Suppl. 13, 321–333 (1960)
Khazan, N., Sawyer, C. H.: Mechanisms of paradoxical sleep as related by neurophysiological and pharmacological approaches in the rabbit. Psychopharmacologia (Berl.) 5, 457–466 (1964)
Key, B. J.: Effects of chlorpromazine and lysergic acid diethylamide on the rate of habituation of the arousal response. Nature (Lond.) 190, 275–277 (1961a)
Key, B. J.: The effect of drugs on discrimination and sensory generalisation of auditory stimuli in cats. Psychopharmacologia (Berl.) 2, 352–363 (1961b)
Key, B. J.: The effect of drugs in relation to the afferent collateral system of the brainstem. Electroenceph. clin. Neurophysiol. 18, 670–679 (1965)
Key, B. J., Bradley, P. B.: The effects of drugs on conditioning and habituation to arousal stimuli in animals. Psychopharmacologia (Berl.) 1, 450–462 (1960)
Miller, R. E., Murphy, J. V., Mirsky, I. A.: The effect of chlorpromazine on fear-motivated behaviour in rats. J. Pharmacol. exp. Ther. 120, 379–387 (1957a)
Miller, R. E., Murphy, J. V., Mirsky, I. A.: Persistent effects of chlorpromazine on extinction of an avoidance response. Arch. Neurol. Psychiat. (Chic.) 78, 526–530 (1957b)
Moruzzi, G.: Synchronising influences of the brain stem and the inhibitory mechanisms underlying the production of sleep by sensory stimulation. In: Moscow Colloquium on Electroencephalography of Higher Nervous Activities, H. H. Jasper and G. D. Smirnov, eds. Electroenceph. clin. Neurophysiol., Suppl. 13, 231–256 (1960)
Sharpless, S., Jasper, H. H.: Habituation of the arousal reaction. Brain 79, 655–680 (1956)
Tissot, R., Bovet, J.: Modifications de l'habituation de la réaction d'arrÊt du rythme a chez l'homme sous l'effect de la Chlorpromazine et du Halopéridol. Psychopharmacologia (Berl.) 10, 298–307 (1967)
Ungerstedt, U.: Stereotaxic mapping of the monoamine pathways in the rat brain. Acta physiol. scand., Suppl. 367, 1–48 (1971)
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Key, B.J. Effect of chlorpromazine on the interaction between phasic and tonic electrocortical arousal mechanisms. Psychopharmacologia 44, 179–185 (1975). https://doi.org/10.1007/BF00421007
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DOI: https://doi.org/10.1007/BF00421007