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Intracellular records were obtained from 31 neurones isolated from the first somatosensory cortical projection area of chloralose-anaesthetized cats. These neurones, which are part of a wider sample of 197 cells recorded extracellularly during the same experiments, were all tested with the electrical stimulation of peripheral receptive fields (PRF) and hence classified as somatotopic (contralateral, specific PRF) or non-somatotopic (wide and bilateral PRF). Upon PRF shocks, sequences of EPSP-IPSP...
In 16 chloralose-anaesthetized, curarized cats, extracellular recordings (glass micropipettes) were obtained from 197 SI neurones, and each one was tested with appropriate electrical stimulation both of their cutaneous receptive fields and of contralateral SI, SII, and anterior lateral associative (ALA) cortical areas. The study of peripheral reactivity showed that 97 neurones were endowed with very restricted, contralateral fields (somatotopic units, Group I), whereas 66 had wide fields, often...
The investigation whose preliminary results are reported herewith, was meant to ascertain the functional properties of S neurones receiving callosal projections. Electrophysiological experiments were performed in 9 chloralose-anaesthetized, curarized cats. By means of glass micropipettes the electrical activity from 71 S neurones was recorded. Each neurone has been tested with the stimulation of the peripheral receptive fields in order to classify the neuronal sample in lemniscal (Group I), extralemniscal...
The synaptic events, induced by transcallosal afferents in somesthetic cortical neurones were studied with intracellular technique in 21 units (14 belonging to SI and 7 to SII), out of a larger sample whose characteristics of transcallosal as well as peripheral reactivity were determined extracellularly. The recordings were obtained from chloralose-anaesthetized, curarized cats by means of glass micropipettes (2M K-citrate or 2.5 M KCl; 10-50 M in resistance) and DC-, AC-amplifying conventional...
Extending our previous research concerned with the reception of callosal messages by the cortical somatosensory areas of the cat, the present experiments were devoted to studying what kind of somesthetic information is transmitted through the fibers of the corpus callosum (CC). By recording electrical activity through coaxial macroelectrodes and tungsten microelectrodes directly from the CC of chloralose-anaesthetized cats, a set of fibers was identified in the rostral part of this commissure (somesthetic...
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