Temporal patterning in the responses of gracile and cuneate neurones in the cat to cutaneous vibration.

Ferrington, D. G.; Horniblow, S; Rowe, Mark J.

doi:10.1113/jphysiol.1987.sp016534

Cited by 15 publications

(32 citation statements)

References 41 publications

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“…Phase locking was tightest over the range 100-300 Hz and fell thereafter, a trend confirmed in Fig. lb F Ferrington et al (1987a).…”

Section: Quantitative Evaluation Of Phase Lockingsupporting

confidence: 57%

“…fibres of the footpads onto individual dorsal column nuclei neurones. Although conclusive evidence already exists for convergence of sensory fibres onto dorsal column nuclei neurones (Ferrington et al 1987a) such evidence has not been established specifically for this class of input fibres from the footpads. In order to resolve this issue we made precise measurements of vibration thresholds at different points on the toes and central footpads after using procedures (see Methods) to minimize the spread of vibration from the point of application on the footpads to adjacent digits.…”

Section: Quantitative Evaluation Of Phase Lockingmentioning

confidence: 99%

“…It is most improbable that the known conduction-velocity variations in different P.c. fibres (Greenstein et al 1987;Ferrington et al 1987a) arrival of activity centrally and therefore account for the tight phase locking observable in the gracile neurone responses (Figs. 2-5).…”

Section: Quantitative Evaluation Of Phase Lockingmentioning

confidence: 99%

“…Within the dorsal column nuclei of the cat there is a prominent representation of inputs from vibration-sensitive receptors in the skin (Perl, Whitlock & Gentry, 1962;Gordon & Jukes, 1964;Bystrzycka, Nail & Rowe, 1977;Douglas, Ferrington & Rowe, 1978;Ferrington & Rowe, 1982;Connor, Ferrington & Rowe, 1984;Ferrington, Horniblow & Rowe, 1987a). The dorsal column nuclei neurones that respond to vibration applied to the footpads form two major classes: one most sensitive to high frequencies (> 100 Hz) and deriving its input from Pacinian corpuscle (P.c.)…”

Section: Introductionmentioning

confidence: 99%

“…Such phase locking is found in dorsal column nuclei neurones up to 400-500 Hz but its presence is puzzling as the P.c. input fibres show considerable dispersion from fibre to fibre in the preferred phase of their responses at frequencies of > 100 Hz (Douglas et al 1978;Greenstein, Kavanagh & Rowe, 1987;Ferrington et al 1987a).…”

Section: Introductionmentioning

confidence: 99%

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Integrative processing of vibratory information in cat dorsal column nuclei neurones driven by identified sensory fibres.

Ferrington

Rowe

Tarvin

1987

The Journal of Physiology

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SUMMARY1. In decerebrate or anaesthetized cats, the vibration-induced responses of dorsal column nuclei neurones were examined, first, when their input came from simultaneously recorded pairs or other combinations of identified Pacinian corpuscle (P.c.) afferent fibres of the interosseous nerve, and secondly, when different convergent sets of P.c. fibres were engaged by footpad vibration.2. Suprathreshold actions were observed on individual dorsal column nuclei neurones from two or more identified P.c. fibres. Recruitment of these convergent fibres usually led to summation in the dorsal column nuclei neurone as reflected in higher response levels compared with those evoked by single-fibre inputs.3. When the input was increased from one to two or more identified P.c. fibres the dorsal column nuclei neurones could retain a single, dominant phase of response to high-frequency (> 100 Hz) vibration even though these fibres, in isolation, evoked responses in the target neurone at substantially different latencies. However, on average, phase locking was significantly tighter in response to single-fibre input than to multiple P.c.-fibre input.4. Dorsal column nuclei neurones were also able to retain phase-locked responses to high-frequency vibration when phase differences between different convergent inputs were systematically introduced to alter the degree of synchrony in the activity arriving over convergent, identified P.c. fibres.5. When the input to dorsal column nuclei neurones came from the skin it was found that with the recruitment of two converging sets of P.c. fibres the dorsal column nuclei neurones were able to retain phase-locked responses to high-frequency vibration even when phase shifts were introduced between the two sets of P.c. inputs.6. In conclusion, the observed integrative processing by dorsal column nuclei neurones of vibration-induced inputs arriving over identified, convergent P.c. fibres, or sets of P.c. fibres, is consistent with our hypothesis that the retention of phase-locked responses to vibration at frequencies > 100 Hz may reflect the functional domination of the target neurone by just one or a few of its convergent input fibres.

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“…Phase locking was tightest over the range 100-300 Hz and fell thereafter, a trend confirmed in Fig. lb F Ferrington et al (1987a).…”

Section: Quantitative Evaluation Of Phase Lockingsupporting

confidence: 57%

Section: Quantitative Evaluation Of Phase Lockingmentioning

confidence: 99%

Section: Quantitative Evaluation Of Phase Lockingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Integrative processing of vibratory information in cat dorsal column nuclei neurones driven by identified sensory fibres.

Ferrington

Rowe

Tarvin

1987

The Journal of Physiology

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Coding of vibration by neurones of the dorsal column nuclei in the pigeon

Reinke

Necker

1996

J Comp Physiol A

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Responses of cat ventroposterolateral thalamic neurons to vibrotactile stimulation of forelimb footpads

et al. 1992

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Responses of neurons in the ventroposterolateral nucleus of the thalamus to vibration applied to the forelimb footpads were analyzed in anesthetized cats in order to describe the signalling properties of thalamic neurons that received input from the different classes of tactile afferents innervating the glabrous skin of the distal forelimb. Seventy-six thalamic neurons, the majority of which (60 of 76) were positively identified as thalamocortical projection neurons, were classified into two broad groups according to their responses to 1-s step indentations of the skin. A minority (24%) comprised neurons that had slowly adapting (SA) responses, whereas the remainder (76%), the dynamically sensitive neurons, had transient responses to the onset and offset phase of the step and were further classified according to their sensitivity to cutaneous vibrotactile stimuli into those activated by low-frequency vibration (rapidly adapting, RA, neurons) and those activated by high frequencies (Pacinian afferent, PC, neurons). Thalamic RA neurons displayed phaselocked responses to vibration at frequencies up to approximately 100 Hz, while PC neurons displayed phaselocked responses to vibration up to 400-500 Hz. Thalamic SA neurons varied in their responses to vibrotactile stimuli; half were most sensitive to vibration frequencies of 50 Hz or less, while the others responded over a broader range of frequencies. Although three major classes of footpad-related thalamic neurons were identified, there was evidence of convergent input to a small proportion of them. The study demonstrates that thalamic neurons have the capacity for responding to cutaneous vibration with phaselocked, patterned impulse trains, which would enable them to encode information about vibrotactile frequencies up to approximately 300 Hz.

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Temporal patterning in the responses of gracile and cuneate neurones in the cat to cutaneous vibration.

Cited by 15 publications

References 41 publications

Integrative processing of vibratory information in cat dorsal column nuclei neurones driven by identified sensory fibres.

Integrative processing of vibratory information in cat dorsal column nuclei neurones driven by identified sensory fibres.

Coding of vibration by neurones of the dorsal column nuclei in the pigeon

Responses of cat ventroposterolateral thalamic neurons to vibrotactile stimulation of forelimb footpads

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