Overlap of Somatic and Auditory Cortical Response Fields in Anterior Ectosylvian Gyrus of Cat

Berman, A. L.

doi:10.1152/jn.1961.24.6.595

Cited by 81 publications

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“…The difference between the two zones, was in the number of individuated spike discharges in the evoked multiple unit cluster; the fringe zone re sponding with a fewer number of discharges, even though similar stimulus strengths were used. Such a differentiation of fringe and focus was never encountered within SI-LTLT cortex, but has been reported in other mi croelectrode studies of SII [Berman, 1961;H aight, 1972], High threshold tap areas (HTT). The rostral and caudal HTT zones were most prominent in the unfissured cortex both rostral and caudal to the SI-LTLT forelimb and hindlimb regions.…”

Section: Second Low Threshold Light Touch Area (Sii-ltlt)mentioning

confidence: 51%

Microelectrode Mapping of Modality-Specific Somatic Sensory Cerebral Neocortex in Slow Loris

Krishnamurti¹,

Sanides²,

Welker³

1976

Brain Behav Evol

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Microelectrode mapping methods and strategies were developed to map fine details of the somatotopic; organization of somatic sensory cortex (SI) in slow loris. In-depth, multiple-unit recording, and threshold natural stimulation of skin and hair revealed three modality-specific cortical areas. The centrally located one was activated by extremely light touch and the somatotopic organization of peripheral projections to it was mapped in detail. As many as 25 punctures/mm² were made in delineating these details. The microelectrode mapping method used revealed smaller receptive fields, lesser degrees of overlap, a more differentiated pattern of peripheral projections, and a more precise correlation of electrophysiological results with underlying cytoarchitectonic details than did the usual macroelectrode surface recording method. These results and the correlations found between different physiologically defined areas and cortical sulci are discussed as they pertain to methodological advances in studies of cerebral localization of function.

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Section: Second Low Threshold Light Touch Area (Sii-ltlt)mentioning

confidence: 51%

Microelectrode Mapping of Modality-Specific Somatic Sensory Cerebral Neocortex in Slow Loris

Krishnamurti¹,

Sanides²,

Welker³

1976

Brain Behav Evol

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“…The existence of such a 'sustaining' projection was suggested by Rose & Woolsey (1958) from their degeneration studies. This projection to both auditory and SII regions may account in part for the overlap of auditory and somatic projections described by Berman (1961).…”

Section: Discussionmentioning

confidence: 88%

Somatic afferent input to posterior thalamic neurones and their axon projection to the cerebral cortex in the cat

Rowe¹,

Sessle²

1968

The Journal of Physiology

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SUMMARY1. A technique of reversible block of synaptic transmission through the dorsal column nuclei and the trigeminal nucleus caudalis (n. caudalis) has been employed to assess the somatic afferent input to individual posterior thalamic neurones in the cat. The axon projection to the cerebral cortex of these neurones has been identified by antidromic activation following cortical stimulation.2. Unitary responses in the nucleus ventralis posterolateralis (VPL) evoked by cutaneous stimulation were abolished or depressed following block of transmission in the dorsal column nuclei. Block in n. caudalis, however, depressed unitary responses in nucleus ventralis posteromedialis (VPM) evoked by facial skin stimulation in less than 10 % of cells.3. A more complex source of the somatic input to the posterior nuclear region of the thalamus (PO) was found. It was most commonly noted that PO unitary activity evoked by cutaneous stimulation of the face was unaffected by block of synaptic transmission in n. caudalis. No uniform effect was observed on unitary responses in PO evoked by limb stimulation when transmission in the dorsal column nuclei was blocked. 4. Antidromic activation from the cerebral cortex was seen in 69 % of ventrobasal neurones. Most cells (66 %) had 'antidromic cortical fields' restricted to a region consisting of a third to a half of the specific somatic projection areas. In 10 % of cells evidence was obtained for discontinuous cortical 'antidromic fields' suggesting subcortical bifurcation of the projecting axon.5. An axon projection to the cortex was found in 35 % of PO cells, about half of which projected only to specific somatic projection areas.

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“…Cortical responses to auditory stimuli were recorded in the anterior ectosylvian gyrus by Mickle & Ades (1952, 1953 and by Berman (1961). These authors showed that the anterior ectosylvian gyrus received primary auditory projections, because the latency of the evoked potential was just as short as that of the response evoked in the primary auditory projection area, and because the auditory response remained unaltered after removal of this area.…”

Section: Discussionmentioning

confidence: 99%

Vestibular, cochlear and trigeminal projections to the cortex in the anterior suprasylvian sulcus of the cat

Landgren¹,

Silfvenius²,

Wolsk³

1967

The Journal of Physiology

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SUMMARY1. Cats anaesthetized with chloralose were used. Potentials evoked by electrical stimulation of the vestibular, cochlear, facial, trigeminal and chorda tympani nerves were recorded with micro-electrodes in the cortex in the anterior syprasylvian sulcus.2. Negative focal potentials with a latency of 3 msec were evoked by stimulation of the contralateral and ipsilateral vestibular nerves. These potentials were located in the lower and upper banks of the sulcus at a level just caudal to the projection of the Group I muscle afferents to the lower bank.3. The cochlear projections were located mainly in the lower bank partially overlapping the vestibular and the Group I fields.4. Trigeminal responses were recorded in both banks of the sulcus but were of largest amplitude and shortest latency rostrally in the upper bank. The potentials evoked by the chorda tympani had a similar distribution but were of low amplitude.5. The hypothesis is suggested, that the cortex in the anterior suprasylvian sulcus plays a role in the orientation of the body and head towards auditory stimuli.

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Overlap of Somatic and Auditory Cortical Response Fields in Anterior Ectosylvian Gyrus of Cat

Cited by 81 publications

References 0 publications

Microelectrode Mapping of Modality-Specific Somatic Sensory Cerebral Neocortex in Slow Loris

Microelectrode Mapping of Modality-Specific Somatic Sensory Cerebral Neocortex in Slow Loris

Somatic afferent input to posterior thalamic neurones and their axon projection to the cerebral cortex in the cat

Vestibular, cochlear and trigeminal projections to the cortex in the anterior suprasylvian sulcus of the cat

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