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ACTIVE SENSING

ACTIVE SENSING. Lecture 5: Motor systems IV. Motor control of the vibrissal system. Whisker movement (whisking control) Touch (perceptual control). A. a. B. b. C. g. D. d. E. Motor control of the vibrissal system. Whisker movement (whisking control) Touch (perceptual control).

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ACTIVE SENSING

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  1. ACTIVE SENSING Lecture 5: Motor systems IV Motor systems

  2. Motor control of the vibrissal system • Whisker movement (whisking control) • Touch (perceptual control) Motor systems

  3. A a B b C g D d E Motor control of the vibrissal system • Whisker movement (whisking control) • Touch (perceptual control) Arc 1 Row D 1 2 3 7 6 5 4 Motor systems

  4. Motor control of the vibrissal system 1mm Horizontal cut through row C Motor systems Dorfl J, 1985, J Anat 142:173-184

  5. Motor control of the vibrissal system 0.5 mm Intrinsic muscles Motor systems Dorfl J, 1982, J Anat 135:147-154

  6. Motor control of the vibrissal system Intrinsic muscles Motor systems Dorfl J, 1982, J Anat 135:147-154

  7. Motor control of the vibrissal system Intrinsic muscles Motor systems Dorfl J, 1982, J Anat 135:147-154

  8. Motor control of the vibrissal system Extrinsic muscles Motor systems Dorfl J, 1982, J Anat 135:147-154

  9. Motor control of the vibrissal system Intrinsic muscles Motor systems Dorfl J, 1982, J Anat 135:147-154

  10. Motor control of the vibrissal system Innervation Motor systems Dorfl J, 1985, J Anat 142:173-184

  11. Motor control of the vibrissal system Innervation - motor Motor systems Dorfl J, 1985, J Anat 142:173-184

  12. Motor control of the vibrissal system Innervation - motor Dorfl J, 1985, J Anat 142:173-184 Row E Row C Motor systems

  13. Motor control of the vibrissal system Innervation - motor Dorfl J, 1985, J Anat 142:173-184 Motor systems

  14. Motor control of the vibrissal system Coordination of extrinsic and intrinsic muscles Hill, Bermejo, Zeigler, Kleinfeld, unpublished Motor systems

  15. Motor control of the vibrissal system Pad motion Motor systems

  16. Motor control of the vibrissal system Pad and whisker motion Motor systems

  17. Motor control of the vibrissal system Innervation - sensory Dorfl J, 1985, J Anat 142:173-184 • A row as a unit of processing Motor systems

  18. Motor control of the vibrissal system Innervation - sensory Dorfl J, 1985, J Anat 142:173-184 Motor systems

  19. Follicle as a motor-sensory junction • Motor control is an integral component of sensation • The sensory organ reports back details of self motion • Plus perturbations of this motion caused by the external world = proprioception Motor systems Dorfl J, 1985, J Anat 142:173-184

  20. Vibrissal proprioception Extrinsic muscles • might contain muscle spindles • Connected to facial bones • might contain tendon organs Intrinsic muscles • No signs of muscle spindles • No bony connections • No joints, no tendons How is whisker movement tracked by the brain? Motor systems

  21. Vibrissal proprioception • Each follicle contains ~2000 receptors • About 20% of them convey pure proprioceptive information • (Other 20% convey proprioceptive information mixed with contact information) • It is not yet clear what aspects of motion they encode: q, q’, q’’, other ? • What is known is that they fire consistently during whisker motion, regardless of contacts with external objects Motor systems

  22. Sensory neuron Motor neuron Motor neuron W receptors spindle ? q’ Knee joint whisker The spinal loop (stretch reflex) The brainstem loop Motor systems

  23. Vibrissal system Skeletal system Proprioceptive loop Proprioceptive loop Contact loop Motor systems

  24. Whisking behavior – reflections of control loops Motor systems

  25. Vibrissal system Skeletal system Proprioceptive loop Proprioceptive loop Contact loop Contact loop Motor systems

  26. Loop sign – effect of context Negative contact loop Positive(?) contact loop Mitchinson, Martin, Grant, Prescott (2007) Proc R Soc Biol Sci Motor systems

  27. Loop sign – effect of context Negative contact loop Mitchinson, Martin, Grant, Prescott (2007) Proc R Soc Biol Sci Motor systems

  28. Brainstem in a dish Nguyen & Kleinfeld, Neuron 2004 Motor systems

  29. Anesthetized brainstem loop is positive Nguyen & Kleinfeld, Neuron 2004 Motor systems

  30. End of Lecture 5 Motor systems

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