Afferent impulses in median nerve fascicles evoked by tactile stimuli of the human hand

Hagbarth, K.‐E.; Hongell, A.; Hallin, Rolf G.; Rk, Hunt

doi:10.1016/0006-8993(70)90183-6

Cited by 100 publications

(28 citation statements)

References 35 publications

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“…Details of electrodes, equipment and recording procedures have been fully described (cf. Vallbo, 1970Vallbo, , 1971Hagbarth, Hongell, Hallin & Torebjork, 1970;Hagbarth, Wallin & Lofstedt, 1975). In brief, insulated tungsten micro-electrodes tapered to a tip of 1-5 ,sm were inserted manually through the skin into the appropriate nerve trunk and guided into an appropriate fascicle with the help of electrical shocks delivered through the micro-electrode.…”

Section: Methodsmentioning

confidence: 99%

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The responses of human muscle spindle endings to vibration of non‐contracting muscles.

Burke¹,

Hagbarth²,

Löfstedt³

et al. 1976

The Journal of Physiology

733

318

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SUMMARY1. In micro-electrode recordings from the human peroneal and tibial nerves, the responses of thirty-two primary spindle endings, thirteen secondary spindle endings and three Golgi tendon organs were studied during vibration of the tendons of the receptor-bearing muscles in the leg. The amplitude of the applied vibration was 1-5 mm and the frequency was varied from 20 to 220 Hz. As checked with e.m.g. and torque measurements, the muscles of the leg were relaxed during the sequences analysed.2. Providing that the vibrator was accurately applied, all endings responded with discharges phase-locked to the vibration cycles, the discharge rates being at the vibration frequency or at subharmonics of that frequency. The response to vibration was of abrupt onset and offset, was maintained for the duration of vibration, and was not subject to fluctuation with changes in attention or with remote muscle contraction.3. The maximal discharge rate that could be achieved varied from one ending to the next, and increased with the length of the receptor-bearing muscle. For endings driven at their maximal rate an increase in vibration frequency produced a decrease in discharge rate as the ending changed to a subharmonic pattern of response. The converse occurred on decreasing vibration frequency.' 4. For any given muscle length, primary endings could generally be driven to higher rates than secondary endings but there was a wide range of responsiveness within each group and a significant overlap between the groups. At medium muscle length, the most responsive primary endings could be driven up to 220 Hz but secondary endings did not reach discharge rates higher than 100 Hz. 5. With combined vibration and passive movements, primary endings

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Section: Methodsmentioning

confidence: 99%

“…An amplitude discriminator (cf. Hagbarth, Hongell, Hallin & Torebjork, 1970) was used to reduce the remaining noise. Unit frequency was calculated using an instantaneous frequency meter with a range of up to 500 Hz (Hagbarth, Wallin & Lofstedt, 1975).…”

Section: Methodsmentioning

confidence: 99%

The responses of human muscle spindle endings to vibration of non‐contracting muscles.

Burke¹,

Hagbarth²,

Löfstedt³

et al. 1976

The Journal of Physiology

733

318

View full text Add to dashboard Cite

show abstract

“…The technique has proved suitable in normal subjects for studying mass neural responses to physiological stimuli (Vallbo and Hagbarth, 1968;Hagbarth et al, 1970) and the evoked compound action potential (Hallin and Torebjork, 1973;Torebjork and Halin, 1973). Even the activity of single sensory fibre axons may be recorded, be they myelinated (Hagbarth et al, 1970) or unmyelinated (Torebjork, 1974;Torebjork and Hallin, 1974).…”

mentioning

confidence: 99%

Cutaneous afferent activity in median and radial nerve fascicles: a microelectrode study.

Burke¹,

MacKenzie²,

Skuse³

et al. 1975

Journal of Neurology, Neurosurgery & Psychiatry

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SYNOPSIS Cutaneous afferent activity was recorded in fascicles of the median and radial nerves of normal subjects using percutaneous microelectrodes. Multi-unit fascicular responses were dominated by activity in large myelinated fibres. Easily tolerated electrical stimuli evoked the full spectrum of fast and slow myelinated fibre activity but more intense levels were required to activate unmyelinated fibres. Correlation of the evoked potentials and the sensations reported by the subject suggested that fast myelinated fibres mediate tactile sensations. Pricking pain appeared with the activation of slow myelinated fibres. The only sensations induced by electrical stimuli were tactile or painful.

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“…In contrast to the well documented responsiveness to passive deformation of the skin, little is known about the responses of these afferents during active movements apart from a few casual observations and inferences on SA II units (Hagbarth, Hongell, Hallin & Torebjork, 1970;Knibestol & Vallbo, 1970;Knibest6l, 1975). This question seemed, however, of considerable interest with regard to the possible contribution of cutaneous afferent signals to kinaesthesia and to motor control at subconscious levels.…”

Section: Introductionmentioning

confidence: 99%

The responses of afferent fibres from the glabrous skin of the hand during voluntary finger movements in man.

Hulliger¹,

Nordh²,

Thelin³

et al. 1979

The Journal of Physiology

292

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1. Afferent activity of 111 single units from the glabrous skin area was recorded percutaneously in the median nerve of human subjects, using tungsten electrodes. 2. The majority of the units (103) were classified as low‐threshold mechano‐sensitive units belonging to one of the four categories previously described: rapidly adapting with small receptive fields (RA), rapidly adapting with large receptive fields (PC, presumed Pacinian corpuscle units), slowly adapting with small fields (SA I), and slowly adapting with large fields (SA II). The size of the responses (in number of impulses) to indentation and stretching of the skin was compared with that of the responses elicited during voluntary isotonic finger movements, which avoided trivial excitation of the units by direct touch. 3. All four types of units, and 77% of the single units, were activated by isotonic movements. The decreasing order of responsiveness was PC, SA II, SA I, RA. 4. Almost all responsive units were excited during the dynamic phase of ramp and smooth oscillatory movements. Static responses, on the other hand, occurred only with 50% of the slowly adapting units, corresponding to a third of the total sample (SA II, 81%; SA I, 17%. 5. For all four types of units the dynamic responses to movements were of similar size as the responses to localized skin indentation with a von Frey hair at five times threshold. 6. The results are discussed with regard to the possible implications for kinaesthesia and motor control.

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Afferent impulses in median nerve fascicles evoked by tactile stimuli of the human hand

Cited by 100 publications

References 35 publications

The responses of human muscle spindle endings to vibration of non‐contracting muscles.

The responses of human muscle spindle endings to vibration of non‐contracting muscles.

Cutaneous afferent activity in median and radial nerve fascicles: a microelectrode study.

The responses of afferent fibres from the glabrous skin of the hand during voluntary finger movements in man.

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