• Corpus ID: 49056577

Properties of cutaneous mechanoreceptors in the human hand-related to touch sensation

@inproceedings{BVallbo1999PropertiesOC,
  title={Properties of cutaneous mechanoreceptors in the human hand-related to touch sensation},
  author={' B.Vallbo},
  year={1999}
}
Recordings from single peripheral nerve fibres made it possible to analyse the functional properties of tactile afferent units supplying the glabrous skin of the human hand and to assess directly the relation between impulse discharge and perceptive experiences. The 17,000 tactile units in this skin area of the human hand are of four different types: two fast adapting types, FA I and FA I1 (formerly RA and PC), and two slowly adapting types, SA I and SA 11. The receptive field characteristics… 

Figures from this paper

Tactile perception across the human foot sole as examined by the firing characteristics of cutaneous afferents and mechanical properties of the skin
TLDR
This dissertation investigated the ability of foot sole cutaneous afferents to respond to exteroceptive, light touch and vibration stimuli, the influence of skin mechanics, and the relationship with tactile perception.
Sensations evoked by microstimulation of single mechanoreceptive afferents innervating the human face and mouth.
TLDR
It is suggested that the spontaneously active afferents that monitor tension in collagen fibers may have the role to register the mechanical state of the soft tissues, which has been hypothesized to help maintain the body's representation in the central somatosensory system.
Site of stimulation effects on the prevalence of the tactile motion aftereffect
TLDR
Which FA units underlie the tactile MAE are investigated by measuring its prevalence, duration, and vividness on different skin areas that vary in their composition of FA units to suggest that the FA I units in the glabrous skin and the hair follicle and/or theFA I and field units inThe hairy skin contribute to the tactileMAE.
Single tactile afferents outperform human subjects in a vibrotactile intensity discrimination task.
TLDR
The superiority in performance of individual neurons over observers could reflect a nonoptimal integration window or be due to the presence of noise between the sensory periphery and the cortical decision stage, and indicate that the range of perceptual sensitivity comes at the cost of discrimination through pooling across neurons with different response functions.
Slow Touch and Fast Nociception: Exploration of the Interactions Between Noxious and Innocuous Mechanical Touch Sensation
TLDR
The work in this thesis investigates the neural basis for ‘slow’ touch and ‘fast pain’ in the human cutaneous somatosensory system concentrating first in the peripheral nervous system before addressing spinal pathways and higher-level consequences of a pathological lack of specific afferent fibre types.
The biology of skin wetness perception and its implications in manual function and for reproducing complex somatosensory signals in neuroprosthetics.
TLDR
The present review explores how thermal and tactile afference from the periphery can generate the percept of wetness centrally, and proposes that the main signals include information about skin cooling, signaled primarily by thinly myelinated thermoreceptors, and rapid changes in touch, through fast-conducting, myelination mechanoreceptors.
Clustering of slowly adapting type II mechanoreceptors in human peripheral nerve and skin.
TLDR
The data do not support the notion that myelinated fibres are randomly organized in peripheral nerve fascicles and suggest that SAII units tend to be clustered in human peripheral nerves, but the response of groups ofSAII units to skin stretch suggests that they play a role in proprioception.
Discriminative touch and emotional touch.
TLDR
It seems reasonable to conclude that CT afferents have not been found in the glabrous skin of the hand in spite of numerous electrophysiological explorations of this area, and a fuller understanding of their function awaits.
Exploring the cortical evidence of a sensory-discrimination process.
TLDR
The results indicate that neurons of the primary somatosensory cortex (S1) generate a neural representation of vibrotactile stimuli which correlates closely with psychophysical performance and may contribute to the sensory-discrimination process studied here.
...
...

References

SHOWING 1-10 OF 51 REFERENCES
Microstimulation of single tactile afferents from the human hand. Sensory attributes related to unit type and properties of receptive fields.
TLDR
It was concluded that a train of impulses in a single tactile unit may produce within the brain of the subject a construct which specifies with great accuracy the skin area of the unit's terminals as well as a tactile subquality which is related to unit properties.
Tactile sensibility in the human hand: receptive field characteristics of mechanoreceptive units in the glabrous skin area.
TLDR
The findings indicate that the RA and SA I units are well suited for the analysis of mechanical events on the skin surface with a high degree of spatial selectivity, whereas the PC and SA II units are suited for analysis of other mechanical events, e.g. vibration and various forms of tension in the skin and related tissues.
The responses of afferent fibres from the glabrous skin of the hand during voluntary finger movements in man.
TLDR
Afferent activity of 111 single units from the glabrous skin area was recorded percutaneously in the median nerve of human subjects, using tungsten electrodes, with possible implications for kinaesthesia and motor control.
Tactile sensibility in the human hand: relative and absolute densities of four types of mechanoreceptive units in glabrous skin.
TLDR
The spatial distribution of densities supports the idea that the RA and SA I units account for spatial acuity in psychophysical tests, which is known to increase in distal direction along the hand.
Spatial properties of the population of mechanoreceptive units in the glabrous skin of the human hand
Single unit analysis of mechanoreceptor activity from the human glabrous skin.
Single unit impulses were recorded from the median and the ulnar nerves in waking human subjects with percutaneously inserted tungsten electrodes. 61 mechanoreceptor units in the glabrous skin were
...
...