Effects of presso- and chemoceptive components of the cat's aortic nerve on sham rage behaviour

Riassunto La stimolazione elettrica delle fibre aortiche a più bassa soglia, presumibilmente d'origine pressocettiva, è capace d'inibire tutte le manifestazioni somatiche e viscerali dell'attività di rabbia del gatto talamico acuto. Uno stimolo maggiore, eccitando un altro gruppo di fibre, probabilmente di tipo chemocettivo, maschera questo effetto inibitorio, portando alla luce in sua vece una forte attivazione del comportamento di rabbia.

---

---

This research has been sponsored jointly by the Aeronautical Systems Division, ASD and the Office of Aerospace Research, OAR, through its European Office, Office of Aerospace Research, United States Air Force, under Contract No. AF 61 (052)-253, and by Consiglio Nazionale delle Ricerche.     

Cerebral projection of group I afferents in fore-limb muscle nerves of cat

Zusammenfassung Bei Reizung der Gruppe I afferenter Fasern der Muskelnerven des Vorderbeins erhält man positive Potentiale mit kurzer Latenz in der somatischen Area I der Grosshirnrinde. Die somatishe Area II bleibt reaktionslos. Die Leitung läuft über das System, Funiculus dorsalis-Lemniscus medialis.     

Foraging behaviour patterns of herring gulls elicited by electrical forebrain stimulation

Zusammenfassung Zwei artspezitische Verhaltensabläufe, die Silbermöwen (Larus argentatus) bei der Futtersuche und Futteraufnahme zeigen, wurden durch elektrische Reizung begrenzter Bezirke des rostralen Vorderhirns experimentell hervorgerufen. Diese Befunde stützen vergleichend-anatomische Schlussfolgerungen über die funktionelle Rolle des rostralen Vorderhirns bei Vögeln.

---

---

The work was supported by grants from the United States Air Force, the Science Research Council and the Royal Society to ProfessorN. Tinbergen and myself. It was partially carried out at the Department of Zoology, Oxford. The assistance of Dr.G. Thompson and Mr.A. Jackson is gratefully acknowledged.     

Crossed reflex actions by low threshold muscle afferents

Zusammenfassung Bei chronisch spinalen Katzen wurde mit Hilfe tetanischer Reizung festgestellt, dass grosse afferente, von Muskeln kommende Fasern gekreuzte Wirkungen auf monosynaptische Reflexe ausüben. Die Ausdehnung der Effekte wird beschrieben.     

Crossed reflex actions evoked by high threshold muscle afferents

Résumé Chez le chat spinal des impulsions provoquées dans les fibres afférentes à seuil élevé d'origine musculaire chez le chat spinal facilitent ou inhibent des motoneurones contra-latéraux fléchisseurs et extenseurs. Chez l'animal décérébré, ces actions croisées sont supprimées, tandis qu'après une lésion pontine, les actions inhibitrices se manifestent.     

Significance of supraspinal control of reflex actions by impulses in muscle afferents

Zusammenfassung An decerebrierten und spinalen Katzen wurden diverse somatische Afferenzen in ihren synaptischen Wirkungen auf Vorderhornzellen verglichen. Bei der decerebrierten Katze waren deren erregende und hemmende Wirkungen stark herabgesetzt oder nicht nachweisbar. Somit werden Zwischenneurone im Reflexbogen durch supraspinale Zentren tonisch gehemmt. Die Bedeutung dieser Kontrolle für die Reflexregulierung wird besprochen.     

Intracellular recording of electrical response of muscle fibre to transversely applied middle-frequency pulse stimulation

Zusammenfassung Der Froschsartorius wird mit Mittelfrequenz(20 kHz)-Stromstössen quer gereizt. Die Reizantwort wird mit intracellulärer Mikroelektrode am Reizort abgeleitet. Die lokale Depolarisierung und die daraus sich ergebende Auslösung des Aktionspotentials werden auf ihre Abhängigkeit von Stärke und Dauer der Reizimpulse untersucht.     

Post-tetanic changes of bilateral dorsal root potentials evoked by stimulation of the cutaneous afferents

Summary In spinal cats following tetanic stimulation of the cutaneous nerve bilateral dorsal root potentials in the lumbar spinal cord are depressed. Because of differences between ipsi- and contralateral potentials, this depression can usually be evoked only on one side of the cord.     

The role of the substantia nigra on the rage reaction elicited by hypothalamic stimulation,in the cat

Summary The effects of substantia nigra stimulation on the rage reaction evoked by hypothalamic activation were studied. The reference value of the rage reaction was the latency of the hissing, which was constant in all animals when hypothalamic stimulation was performed with the same parameters. Simultaneous activation of substantia nigra and hypothalamus determined a significant decrease in hissing latency. The influence of the substantia nigra on the affective components of the aggressive behavior is underlined.This work was supported by a grant from the Consiglio Nazionale delle Ricerche Roma, Italy.     

The role of the substantia nigra on the rage reaction elicited by hypothalamic stimulation, in the cat

The effects of substantia nigra stimulation on the rage reaction evoked by hypothalamic activation were studied. The reference value of the rage reaction was the latency of the hissing, which was constant in all animals when hypothalamic stimulation was performed with the same parameters. Simultaneous activation of substantia nigra and hypothalamus determined a significant decrease in hissing latency. The influence of the substantia nigra on the affective components of the aggressive behavior is underlined.     

Reticular potentials evoked by electrical stimulation of individual semicircular canals

Summary Responses of pontine reticular formation neurons following single shock electrical stimulation of single semicircular canals were recorded with tungsten microelectrodes in 40 curarized guinea-pigs. The field and unitary potentials obtained from 62 reticular sites, exhibited latency values ranging from 0.3 to 2.5 msec. The early latencies (0.3–0.5 msec) have been interpreted as responses mediated by primary vestibular fibres projecting directly to the reticular substance.This work was supported by a grant of CNR.     

Post-tetanic changes of bilateral dorsal root potentials evoked by stimulation of the cutaneous afferents.

In spinal cats following tetanic stimulation of the cutaneous nerve bilateral dorsal root potentials in the lumbar spinal cord are depressed. Because of differences between ipsi- and contralateral potentials, this depression can usually be evoked only on one side of the cord.     

Influence of cervical sympathetic nerve stimulation on carotid sinus baroreceptor afferents

Summary In rabbits and dogs, the response of low-threshold carotid sinus baroreceptor afferent fibres to cervical sympathetic nerve stimulation at various non-pulsatile steady pressures was examined. Fibres which possessed a rhythmic bursting discharge at low pressures increased this activity during sympathetic stimulation; all other low-threshold afferents were unaffected.This work was supported by the Medical Research Council of Canada and the British Columbia Heart Foundation.