Observations on single neurons recorded in the sigmoid gyri of awake, nonparalyzed cats

Baker, M. A.; Tyner, C.F.; Towe, A.L.

doi:10.1016/0014-4886(71)90006-9

Cited by 42 publications

(10 citation statements)

References 21 publications

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“…Among these cells 40 % had 'probably cutaneous' receptive fields, 30 % responded only to deep inputs and the remaining cells appeared to receive convergent input from both deep and superficial receptors. These findings are closely comparable with those of Baker et al (1971) whose data from awake cats indicate that taking anterior and posterior sigmoid gyri together ca. 35 % of neurones responded to hair movement and/or light touch, 40 % to joint movement or palpation and 20 % to both deep and superficial stimuli.…”

Section: Representation Offorelimbsupporting

confidence: 88%

“…joint movements) and Sakata & Miyamoto (1968) found in free-to-move cats that 61 % of cells received cutaneous input and 32 % responded to joint movement. Our study (and that of Baker et al 1971) differs from these two latter principally in the smaller proportion of cells classed as 'cutaneous' and this in turn reflects our inclusion ofa substantial category receiving deep/superficial convergence. Admittedly, stimulus typing can be difficult in free-to-move animals but we nevertheless believe that the apparent convergence was usually real.…”

Section: Representation Offorelimbmentioning

confidence: 51%

“…However, receptive fields could not be defined with the precision achievable in anaesthetized or paralysed animals (cf. Baker et al 1971;Armstrong & Drew, 1984b).…”

Section: Somatotopy In Cat Motor Cortex Receptive Field Determinatio8wmentioning

confidence: 99%

“…Many studies have shown that motor cortical neurones in the cat (including pyramidal tract neurones; p.t.n.s) are readily discharged by natural stimulation of cutaneous and deep mechanoreceptors of the limbs and trunk (e.g. Welt, Aschoff, Kameda & Brooks, 1967;Baker, Tyner & Towe, 1971). Receptive fields have been defined in detail and it has been demonstrated that cells encountered in the course of a micro-electrode track perpendicular to the cortical surface have receptive fields which are usually similar in location, though not necessarily in modality.…”

Section: Introductionmentioning

confidence: 99%

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Topographical localization in the motor cortex of the cat for somatic afferent responses and evoked movements.

Armstrong¹,

Drew²

1984

The Journal of Physiology

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SUMMARY1. Microwires chronically implanted in the pericruciate cortex of free-to-move cats were used to record extracellularly from cortical neurones and to deliver intracortical stimulation.2. Natural stimulation of cutaneous and/or deep mechanoreceptors in limbs and trunk evoked discharges in 89 % of 165 neurones, 57 % of which were pyramidal tract neurones.3. Out of 112 cells with receptive fields on the contralateral forelimb, 41 % had cutaneous fields, 29 % had fields involving deep tissues and 30 % were driven from both sources.4. Cutaneous receptive fields were much commoner than deep ones among cells with fields including the forefoot; this relationship was reversed for cells with more proximal fields. Many more cells had distal than proximal fields.5. The 'zones' of the forelimb (i.e. foot, wrist, elbow, shoulder) provided input to widespread and overlapping cell populations within the coronal gyrus and the lateral parts of the anterior and posterior sigmoid gyri.6. Despite the overlap a somatotopy existed with successively more distal limb zones represented successively further laterally in the pericruciate area.7. Intracortical stimulation (eleven cathodal pulses, duration 0-2 ms, frequency 330 Hz, intensity 35 ,uA or less) evoked flick movements of the contralateral limbs which were abolished by pyramidectomy.8. In the forelimb, shoulder movements were commonest and elbow, wrist and digits were represented with decreasing frequency.9. Both for 35 ,uA and for threshold stimulation the distributions of the effective electrodes revealed an overlapping somatotopy such that the wrist movements were almost restricted to the coronal gyrus and shoulder movements were most often evoked from the lateral part of the anterior sigmoid gyrus.10. The movement and receptive field somatotopies overlapped heavily but the former showed a distinct lateral shift relative to the latter. As a result shoulder movements were not uncommonly evoked from the coronal gyrus although the shoulder provided almost no input to cells in that area.

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Section: Representation Offorelimbsupporting

confidence: 88%

Section: Representation Offorelimbmentioning

confidence: 51%

“…However, receptive fields could not be defined with the precision achievable in anaesthetized or paralysed animals (cf. Baker et al 1971;Armstrong & Drew, 1984b).…”

Section: Somatotopy In Cat Motor Cortex Receptive Field Determinatio8wmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Topographical localization in the motor cortex of the cat for somatic afferent responses and evoked movements.

Armstrong¹,

Drew²

1984

The Journal of Physiology

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“…Surround inhibition has also been described for neurones at other stages in the dorsal column system: in the dorsal column nuclei (Gordon & Jukes, 1964;Andersen, Etholm & Gordon, 1970;Bystrzycka, Nail & Rowe, 1977;Aoki, 1981); the thalamus (Poggio & Mountcastle, 1963;Gordon & Manson, 1967;Baker, 1971;Janig, Spencer & Younkin, 1979) and in the somatosensory cortex (Mountcastle & Powell, 1959;Baker, Tyner & Towe, 1971;Laskin & Spencer, 1979). It has generally been considered to provide a mechanism for improving spatial discrimination of tactile stimuli (Mountcastle & Powell, 1959;Gordon & Paine, 1960;Andersson, 1962).…”

Section: Discussionmentioning

confidence: 99%

Cutaneous excitatory and inhibitory input to neurones of the postsynaptic dorsal column system in the cat.

Noble

Riddell

1988

The Journal of Physiology

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SUMMARY1. In chloralose-anaesthetized cats single-unit microelectrode recordings were made from axons in the dorsal columns, at the lumbar level, identified as belonging to the postsynaptic dorsal column (PSDC) system.2. Excitatory and inhibitory receptive field arrangements of a sample of seventyfive PSDC neurones were examined in detail using natural cutaneous stimuli.3. The sample was characterized by a high degree of convergent input: 80% of units were activated by both light tactile and noxious mechanical stimuli and more than half of those examined were excited by noxious radiant heat. In addition, threequarters of the units had inhibitory receptive fields on the ipsilateral limb.4. Twenty-three units (27 %) were influenced by input from areas of both hairy and glabrous skin covering the foot and distal limb. Neurones in this group had complex receptive fields, many of which occupied several discontinuous areas of skin. Background and evoked activity of these units could frequently be inhibited by light tactile and/or noxious stimuli. Their inhibitory receptive fields occupied small areas of skin overlapping or adjacent to excitatory fields.5. Fifty-two units (73 %) had receptive fields restricted to areas of hairy skin on the thigh and upper hindlimb. Half the units in this group had coextensive low-and high-threshold excitatory areas but about one-third had a concentric receptive field organization; a high-threshold excitatory component extending beyond, or around, a central low-threshold area. The discharge of these units could be inhibited only by light tactile stimuli. Their inhibitory receptive fields covered extensive areas of skin, sometimes completely surrounding the excitatory field.6. The complex receptive field arrangements observed for neurones of the postsynaptic dorsal column system are discussed in relation to previous observations on dorsal horn neurones of other ascending tracts.

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Receptive field properties of somatosensory neurons in the cat superior colliculus

Clemo¹,

Stein²

1991

J of Comparative Neurology

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In general, knowledge of the internal organization of receptive fields has played an important role in shaping current understanding of sensory physiology. Such knowledge is particularly important for understanding the function of the superior colliculus, since this structure is at once implicated in spatial localization and has relatively large receptive fields. While this issue has been addressed in the visual and auditory modalities represented in the superior colliculus, there are no previous studies of its somatosensory receptive field organization. Here, the properties of somatosensory receptive fields in the cat superior colliculus were studied quantitatively to determine whether they contain internal non-homogeneities that might aid in the determination of stimulus detail. Of special interest was the possibility that these comparatively large receptive fields would contain areas of differential excitability that could aid in spatial resolution, that within-field spatial summation and/or inhibition would be exhibited, and that the borders of the excitatory receptive field would be flanked by inhibitory regions. The data demonstrate that while inhibition beyond the receptive field borders is a rarity, these somatosensory receptive fields nearly always contain a well-defined area of maximal sensitivity within which the size of the stimulus is a critical feature in determining the magnitude of the response. These best areas are systematically distributed across receptive fields as a function of their location in the structure, and indicate that the resolution of stimulus location and size may be greater than expected on the basis of receptive field size alone.

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Observations on single neurons recorded in the sigmoid gyri of awake, nonparalyzed cats

Cited by 42 publications

References 21 publications

Topographical localization in the motor cortex of the cat for somatic afferent responses and evoked movements.

Topographical localization in the motor cortex of the cat for somatic afferent responses and evoked movements.

Cutaneous excitatory and inhibitory input to neurones of the postsynaptic dorsal column system in the cat.

Receptive field properties of somatosensory neurons in the cat superior colliculus

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