Sensory hind-limb representation in Sml cortex of the cat. A unit analysis

Levitt, Janice; Levitt, M.

doi:10.1016/0014-4886(68)90056-3

Cited by 30 publications

(3 citation statements)

References 47 publications

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“…On the contrary, neither the endings of the muscle stretch receptors nor the Golgi tendon organs were found to be represented in the hindlimb area of the sensory-motor cortex [17]. This conclusion is in agreement with that of others based upon evoked potentials employing group I volleys of the hind limb [24,25,27].…”

Section: Discussionsupporting

confidence: 81%

Peripheral Influences on VPM-VPL Thalamic Nuclei in the Human A Study on Evoked Potentials

Divitiis¹,

Giaquinto²,

Signorelli³

1971

Stereotact Funct Neurosurg

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Thalamic evoked potential (TEP) was recorded in VPM-VPL nuclei following ulnar and sciatic stimulation in humans. The latencies of the early positive deflection were found respectively at 9.6±1.5 and 21.2±3.1 msec for stimulation at the elbow and at the popliteal fossa. It was proved that TEP is not produced by muscular activity and is unaffected by attention or distraction. Stimulation of low threshold afferent fibers of the ulnar nerve was followed by TEP, even in the absence of EMG responses. Their nature is discussed. No clear evidence was found that group I afferent fibers of the sciatic nerve project to the thalamus. Group II cutaneous fibers project to the thalamus also through a fast route; late components of TEP (40–45 msec for the ulnar nerve stimulation) are assigned to group III excitation.

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Section: Discussionsupporting

confidence: 81%

Peripheral Influences on VPM-VPL Thalamic Nuclei in the Human A Study on Evoked Potentials

Divitiis¹,

Giaquinto²,

Signorelli³

1971

Stereotact Funct Neurosurg

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“…The proportion of deep columns were said to be greater in the regions of SI caudal to area 3 while the proportion of cutaneous responses were greatest in the center of the somatosensory cortex. Subsequent to these experiments, cortical columns have been studied by numerous workers (Welt et al, 1967;Levitt and Levitt, 1968;Dreyer et al, 1975) confirming the existence of functionally homogenous regions separated by boundaries where the function and receptive field change abruptly. Comparable functional units were reported in the visual cortex (Hubel and Wiesel, 1962) soon after their description in the somatosensory cortex and equivalent, vertically-arranged functional units were reported in the auditory cortex (Hindetal., 1960).…”

Section: The Cortical Column and Modality Specificitymentioning

confidence: 90%

Parallel Processing of Cutaneous Information in the Somatosensory System of the Cat

Dykes

1982

Can. j. neurol. sci.

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RESUME: Dans le passe le principe de base des mecanismes corticaux du systeme sensitif furent fondes en grande partie sur le resultat de Vetude du systeme somatosensitif. Les idees de cartes topographiques de colonnes corticales, de specificite module, ont toutes originees dans Vetude de ce systeme, pour etre ensuite appliquees aux systemes auditifs et visuels. Re'cemment des changements fondamentaux se sont produits dans notre comprehension des fonctions somatosensitives et corticales, ces concepts nouveaux s'appliqueront bientdt aux autres systemes. Le present article detaille ces developpements.

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“…Units with wide field or off-focus driving have been recorded from other areas of somatosensory cortex (Baker et al, 1971;Towe et al, 1968) and ventrobasal thalamus (Bava et al, 1966b;Harris, 1970;Jabbur et al, 1972;Mallart et al, 1961;Shimazu et al, 1965), but we found no forepaw driving in our control sample of 67 units. Under similar conditions of pentobarbital anesthesia, Levitt and Levitt (1968a) also failed to find a single forepaw-activated unit in their sample of 588 units taken from a wider area of hindlimb cortex. A similar restriction of receptive field is found in the coronal forepaw focus (S1) of unanesthetized (Baker et al, 1971) or chloralose-anesthetized cats (Towe et al, 1968).…”

Section: Discussionmentioning

confidence: 98%

Somatosensory function and cortical unit activity in cats with only dorsal column fibers

1977

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Cats received lesions that transected the entire thoracic cord except for partial sparing of the dorsal columns. The cats were required to discriminate the side on which they were touched, the size of simultaneously presented discs, or the direction their fur was stroked to obtain food reward. All cats found by anatomical and/or electrophysiological criteria to have any functional continuity in the dorsal columns were able to master the first of these tasks; some responded above chance on the second. Performance was at chance on blank trials, and cats with complete cord transection failed to discriminate. Lesioned cats did not orient or otherwise react to any nonrewarded stimulus below the level of the lesion. A total of 532 units were recorded under light barbiturate anesthesia from the hind paw projection near the tip of the ansate sulcus in these and other similarly prepared cats. Three-fourths of the units found before and acutely after the cord lesions were made were driven by hind limb stimulation. Only 27% of the units recorded 10 or more days afterwards could be driven. Of these driven units, 15 (38%) responded to foreleg stimulation, 13 exclusively so. No such units were found in intact or acutely lesioned cats.

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Sensory hind-limb representation in Sml cortex of the cat. A unit analysis

Cited by 30 publications

References 47 publications

Peripheral Influences on VPM-VPL Thalamic Nuclei in the Human A Study on Evoked Potentials

Peripheral Influences on VPM-VPL Thalamic Nuclei in the Human A Study on Evoked Potentials

Parallel Processing of Cutaneous Information in the Somatosensory System of the Cat

Somatosensory function and cortical unit activity in cats with only dorsal column fibers

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