motor systems1 active sensing lecture 5: motor systems iv
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Motor systemsMotor systems 11
ACTIVE SENSINGACTIVE SENSING
Lecture 5: Motor systems IVLecture 5: Motor systems IV
Motor systemsMotor systems 22
Motor control of the vibrissal systemMotor control of the vibrissal system
Whisker movement (whisking control)
Touch (perceptual control)
Motor systemsMotor systems 33
Motor control of the vibrissal systemMotor control of the vibrissal system
Whisker movement (whisking control)
Touch (perceptual control)
1 2 3 4 5 6 7
A
B
C
D
E
Row D
Arc
1
Motor systemsMotor systems 44
Motor control of the vibrissal systemMotor control of the vibrissal system
Dorfl J, 1985, J Anat 142:173-184
Horizontal cut through row C
1mm
Motor systemsMotor systems 55
Motor control of the vibrissal systemMotor control of the vibrissal systemIntrinsic muscles
Dorfl J, 1982, J Anat 135:147-154
0.5 mm
Motor systemsMotor systems 66
Motor control of the vibrissal systemMotor control of the vibrissal systemIntrinsic muscles
Dorfl J, 1982, J Anat 135:147-154
Motor systemsMotor systems 77
Motor control of the vibrissal systemMotor control of the vibrissal systemIntrinsic muscles
Dorfl J, 1982, J Anat 135:147-154
Motor systemsMotor systems 88
Motor control of the vibrissal systemMotor control of the vibrissal systemExtrinsic muscles
Dorfl J, 1982, J Anat 135:147-154
Motor systemsMotor systems 99
Motor control of the vibrissal systemMotor control of the vibrissal systemIntrinsic muscles
Dorfl J, 1982, J Anat 135:147-154
Motor systemsMotor systems 1010
Motor control of the vibrissal systemMotor control of the vibrissal systemInnervation
Dorfl J, 1985, J Anat 142:173-184
Motor systemsMotor systems 1111
Motor control of the vibrissal systemMotor control of the vibrissal system
Innervation - motor
Dorfl J, 1985, J Anat 142:173-184
Motor systemsMotor systems 1212
Motor control of the vibrissal systemMotor control of the vibrissal system
Innervation - motor
Dorfl J, 1985, J Anat 142:173-184
Row ERow C
Motor systemsMotor systems 1313
Motor control of the vibrissal systemMotor control of the vibrissal system
Innervation - motor
Dorfl J, 1985, J Anat 142:173-184
Motor systemsMotor systems 1515
Motor control of the vibrissal systemMotor control of the vibrissal systemCoordination of extrinsic and intrinsic muscles
Hill, Bermejo, Zeigler, Kleinfeld, unpublished
Motor systemsMotor systems 1616
Motor control of the vibrissal systemMotor control of the vibrissal systemPad motion
Motor systemsMotor systems 1717
Motor control of the vibrissal systemMotor control of the vibrissal systemPad and whisker motion
Motor systemsMotor systems 1818
Motor control of the vibrissal systemMotor control of the vibrissal system
Innervation - sensory
Dorfl J, 1985, J Anat 142:173-184
•A row as a unit of processing
Motor systemsMotor systems 1919
Motor control of the vibrissal systemMotor control of the vibrissal system
Innervation - sensory
Dorfl J, 1985, J Anat 142:173-184
Motor systemsMotor systems 2020
Follicle as a motor-sensory junctionFollicle 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
Dorfl J, 1985, J Anat 142:173-184
=proprioception
Motor systemsMotor systems 2121
Vibrissal proprioceptionVibrissal proprioception
•might contain muscle spindles •Connected to facial bones•might contain tendon organs
Extrinsic muscles
•No signs of muscle spindles •No bony connections•No joints, no tendons
Intrinsic muscles
How is whisker movement tracked by the brain?How is whisker movement tracked by the brain?
Motor systemsMotor systems 2222
Vibrissal proprioceptionVibrissal 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: ’’’other
• What is known is that they fire consistently
during whisker motion, regardless of
contacts with external objects
Motor systemsMotor systems 2323
The spinal loop (stretch reflex)The spinal loop (stretch reflex)
Knee joint
Motor neuron
’’spindle
whisker
Motor neuron
W receptors
Sensory neuron
The brainstem loopThe brainstem loop
Motor systemsMotor systems 2525
Contact loop
Proprioceptive loop
Proprioceptive loop
Skeletal systemVibrissal system
Motor systemsMotor systems 2626
Whisking behavior – reflections of control loopsWhisking behavior – reflections of control loops
Motor systemsMotor systems 2727
Contact loop
Proprioceptive loop Proprioceptive loop
Skeletal systemVibrissal system
Contact loop
Motor systemsMotor systems 2828
Loop sign – effect of contextLoop sign – effect of context
Mitchinson, Martin, Grant, Prescott (2007) Proc R Soc Biol Sci
Positive(?) contact loopNegative contact loop
Motor systemsMotor systems 2929
Loop sign – effect of contextLoop sign – effect of context
Mitchinson, Martin, Grant, Prescott (2007) Proc R Soc Biol Sci
Negative contact loop
Motor systemsMotor systems 3030
Brainstem in a dishBrainstem in a dish
Nguyen & Kleinfeld, Neuron 2004
Motor systemsMotor systems 3131
Anesthetized brainstem loop is positiveAnesthetized brainstem loop is positive
Nguyen & Kleinfeld, Neuron 2004
Motor systemsMotor systems 3232
End of Lecture 5End of Lecture 5
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