𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Gating of tactile input from the hand

✍ Scribed by R. F. Schmidt; H. E. Torebjörk; W. J. L. Schady

Publisher
Springer-Verlag
Year
1990
Tongue
English
Weight
525 KB
Volume
79
Category
Article
ISSN
0014-4819

No coin nor oath required. For personal study only.

✦ Synopsis

Tactile sensations of flutter or pressure were evoked in alert human subjects by intraneural microstimulation in the median nerve. Ratings were obtained of the magnitude of sensations at threshold for conscious detection during movement of the finger to which they were projected, of neighbouring fingers or of the opposite hand. Results showed that inhibition of flutter sensation was maximal in the moved finger (48%), with a weaker graded effect from adjacent (23%) to distant (19%) fingers of the same hand. Sensations of pressure were more markedly suppressed but the gradients were similar. Movement of the opposite hand and isometric contraction of the forearm muscles had little effect. Local anaesthetic blocks of the median and other upper limb nerves counteracted most of the inhibitory effect of movement on cutaneous flutter sensation. We conclude that sensory gating is largely restricted to the moved digits, that it applies to submodalities of both flutter and pressure and that sensory gating is mostly mediated by cutaneous receptor input from the hand.

📜 SIMILAR VOLUMES

Gating of tactile input from the hand
Gating of tactile input from the hand
✍ R. F. Schmidt; W. J. L. Schady; H. E. Torebjörk 📂 Article 📅 1990 🏛 Springer-Verlag 🌐 English ⚖ 589 KB

Intraneural microstimulation within the median nerve of alert healthy subjects was used to evoke tactile sensations at threshold for conscious detection. The effect of movement on these sensations was studied by asking the subjects to estimate their magnitude before, during and after movement of the

Functional organization of tactile input
Functional organization of tactile inputs from the hand in the cuneate nucleus and its relationship to organization in the somatosensory cortex
✍ Xu, J.; Wall, J.T. 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 788 KB

Central processing of tactile inputs from the hand begins in the main cuneate nucleus and continues in the thalamus and area 3b cortex. Little is known about cuneate functional organization in primates or about how cuneate and area 3b organization are related. In this study, neurophysiologic approac