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- W2076924974 abstract "<h3>ABSTRACT</h3> The somatosensory system decodes a range of tactile stimuli to generate a coherent sense of touch. Discriminative touch of the body depends on signals conveyed from peripheral mechanoreceptors to the brain via the spinal cord dorsal column and its brainstem target the dorsal column nuclei (DCN)<sup>1, 2</sup>. Models of somatosensation emphasize that fast-conducting low- threshold mechanoreceptors (LTMRs) innervating the skin drive the DCN<sup>3, 4</sup>. However, post- synaptic dorsal column neurons (PSDCs) within the spinal cord dorsal horn also collect mechanoreceptor signals and form a second major input to the DCN<sup>5–7</sup>. The significance of PSDCs and their contributions to the coding of touch have remained unclear since their discovery. Here, we show that direct LTMR inputs to the DCN convey vibrotactile stimuli with high temporal precision, whereas PSDCs primarily encode touch onset and the intensity of sustained contact into the high force range. LTMR and PSDC signals topographically re-align in the DCN to preserve precise spatial detail. Different DCN neuron subtypes have specialized responses that are generated by unique combinations of LTMR and PSDC inputs. Thus, LTMR and PSDC subdivisions of the dorsal column encode different tactile features and differentially converge in the DCN to generate unique ascending sensory processing streams." @default.
- W2076924974 created "2016-06-24" @default.
- W2076924974 creator A5015828915 @default.
- W2076924974 date "1989-07-31" @default.
- W2076924974 modified "2023-09-26" @default.
- W2076924974 title "Group rotation from the bottom up" @default.
- W2076924974 doi "https://doi.org/10.3905/jpm.1989.409220" @default.
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