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Microelectrode recordings from the SII cortical area of chloralose-anaesthetized cats have been performed in order to ascertain the peripheral reactivity of the neurones receiving cortico-cortical projections from the ipsilateral SI area. With glass micropipettes, extracellular records were obtained from 64 cells isolated in the forepaw focus, and each one was tested with stimulation both of its peripheral receptive field (PRF) and of the forepaw region of the SI. Twenty-two such units were endowed...
Experiments have been carried out in order to study which ascending spinal pathways are utilized by peripherally-originated impulses and activating callosal fibres. In chloralose-anaesthetized cats stim uli of graded intensities were applied to the superficial (SRN) and deep (DRN) radial nerves. Mass potentials were recorded simultaneously from the cerebral cortex (SI, SII and 3a areas, according to the experiment), from the somesthetic callosal region (SCR) and, on some occasions, from the distal...
Experiments have been carried out in order to study in the first somato-sensory area (SI) the relationships between the topography of callosal neurones and the physiological map of the trunk. Horseradish peroxidase (HRP) was injected into the posterior sygmoid gyrus of one hemisphere of 20 adult cats. On 11 of them, the contralateral homotopic cortex was explored with tungsten microelectrodes on the day after HRP delivery. Neurones retrogradely labelled by HRP (callosal neurones) were grouped within...
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