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At least 1,603 records · Page 89Linked to original sources
PubMed1976

A microelectrode study of amygdaloid afferents: temporal neocortical inputs.

Acute experiments were performed on anesthetized cats using standard techniques of electrical stimulation and single unit recording in order to study the responses of amygdaloid neurons to neocortical inputs. Satisfactory records were obtained from 272 amygdaloid neurons. The majority of those fired spontaneously, at low rates, with single, randomly occurring spikes. The lateral neocortex, particularly the portion which is homologous to temporo-insular cortex in man, is capable of influencing the discharges of many amygdaloid neurons. The typical response pattern consisted of an excitatory-inhibitory sequence with the median onset latency of 12.0 msec, which is consistent with monosynaptic excitation of the output-type nerve cells in the affected regions of the amygdala (Al, Ac, Ab). There was an absence of clear topographical arrangement: all of the effective neocortical areas influenced the neuronal discharges in Al, Ac and Ab fairly equally. These results correlate well with neuroanatomical studies of amygdaloid structure and connectivity. Our finding of diffuse non-topographic excitatory influence upon the lateral, central and basal amygdaloid nuclei exerted by insular-temporal regions known to be involved with higher order sensory analysis and pattern recognition is quite consistent with a view of this system serving as a link between neocortical information stores and the fundamental motivational drive mechanisms of the hypothalamus.

Amygdala↗
PubMed1981

A special holder allows replacement of the recording barrel of a 'piggy-back' multibarrel microelectrode.

A new form of multibarrel micropipette is described. The special holder has several advantages: it can be quickly replaced if it is damaged; the multi-barrel injection portion of the pipette and the drugs it contains can be reused; contamination by spill-over of drugs from one barrel to another is prevented and pressure techniques can be applied using this micro-electrode.

Electrodes↗
PubMed1984

A multiple floating microelectrode for chronic implantation and longterm single unit recording in the cat.

This paper describes a multiple electrode, suitable for chronic implantation and single unit recording in the superficial cerebral cortex of the cat. The electrodes are fine wires, 5-8 per implant, not kept together in a bundle; a segment of them floats freely in saline in a closed chamber over the place of penetration. The electrode tips are not sharpened electrolytically, but cut at a bevel during surgery. Longevity of the implants is improved by slowing down the occasional rapid head shaking characteristic of cats, which tends to tear out implanted electrodes, by means of a small weight attached by a bar to the head.

Animals↗