Abstract
To use sensory information from the skin to guide motor behaviour the central nervous system must transform sensory coordinates into movement coordinates. As yet, the basic principles of this crucial neural computation are unclear. One motor system suitable as a model for the study of such transformations is the spinal withdrawal reflex system. The spatial organization of the cutaneous input to these reflexes has been characterized, and we now introduce a novel method of motion analysis permitting a quantitative analysis of the spatial input-output relationship in this motor system. For each muscle studied, a “mirror-image” relationship was found between the spatial distribution of reflex gain for cutaneous input and the pattern of cutaneous unloading ensuing on contraction. Thus, there is an “imprint” of the movement pattern on this motor system permitting effective sensorimotor transformation. This imprint may indicate the presence of a learning process which utilizes the sensory feedback ensuing on muscle contraction.
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References
Asanuma H (1989) The motor cortex. Raven, New York, pp 1–189
Ekerot C-F, Garwicz M, Schouenborg J (1991a) Topography and nociceptive receptive fields of climbing fibres projecting to the cerebellar anterior lobe in the cat. J Physiol (Lond) 441:257–274
Ekerot C-F, Garwicz M, Schouenborg J (1991b) The postsynaptic dorsal column pathway mediates cutaneous nociceptive information to cerebellar climbing fibres in the cat. J Physiol (Lond) 441:275–284
Garwicz M, Ekerot, C-F, Schouenborg J (1992) Distribution of cutaneous nociceptive and tactile climbing fibre input to sagittal zones in cat cerebellar anterior lobe. Eur J Neurosci 4:289–295
Goldberg ME (1991) Group report: what are the functions of sensory signals in the organization of movement and how do motor signals select and shape sensory input? In: Humphrey DR, Freund H-J (eds) Motor control: concepts and issues. Wiley and Sons, Chichester, New York, pp 245–262
Jankowska E (1992) Interneuronal relay in spinal pathways from proprioceptors. Prog Neurobiol 38:335–378
Kalliomäki J, Schouenborg J, Dickenson AH (1992) Differential effects of a distant noxious stimulus on hindlimb nociceptive withdrawal reflexes in the rat. Eur J Neurosci 4:648–652
Lundberg A (1982) Inhibitory control from the brain stem of transmission from primary afferents to motoneurons, primary afferent terminals and ascending pathways. In: Sjölund BH, Björklund A (eds) Brain stem control of spinal mechanisms. Elsevier Biomedical, Amsterdam, pp 179–224
Ripley BD (1981) Spatial statistics. Wiley, New York
Ripley BD (1988) Statistical inference for spatial processes. Cambridge University Press, New York pp 1–148
Schomburg ED (1990) Spinal sensorimotor systems and their supraspinal control. Neurosci Res 7:265–340
Schouenborg J, Holmberg H, Weng H-R (1992) Functional organization of the nociceptive withdrawal reflexes. II. Changes of excitability and receptive fields after spinalization in the rat. Exp Brain Res 90:469–478
Schouenborg J (1992) A quantitative analysis of the sensorimotor transformation in the nociceptive withdrawal reflex pathways. Eur J Neurosci, Suppl 5: P 194
Schouenborg J, Kalliomäki J (1990) Functional organization of the nociceptive withdrawal reflexes. I. Activation of hindlimb muscles in the rat. Exp Brain Res 83:67–78
Sherrington CS (1910) Flexion-reflex of the limb, crossed extension-reflex and reflex stepping and standing. J Physiol (Lond) 40:28–121
Willis WD Jr, Coggeshall RE (1991) Sensory mechanisms of the spinal cord, 2nd edn. Plenum, New York, pp 1–575
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Schouenborg, J., Weng, HR. Sensorimotor transformation in a spinal motor system. Exp Brain Res 100, 170–174 (1994). https://doi.org/10.1007/BF00227291
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DOI: https://doi.org/10.1007/BF00227291