Paul DiZio and Jim Lackner

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Paul DiZio and Jim Lackner Ashton Graybiel
Spatial Orientation Laboratory Rabb Basement,
85-1 dizio_at_brandies.edu www.graybiel.brandeis.edu
X62043
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NON-CONTACTING, INERTIAL FORCE Coriolis force in
a rotating, artificial gravity environment
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NON-CONTACTING, INERTIAL FORCE Coriolis force in
a rotating, artificial gravity environment
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NON-CONTACTING, INERTIAL FORCE Coriolis force
during voluntary turn reach in a natural
environment
Shoulder Torque
Coriolis

Total

Reach, Stationary environment

Ext Flex

0

0.4

Time s

Turn reach, Stationary environment
Ext Flex

0

0.6

Time s

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CONTACT FORCE - from manipulated
object Velocity-dependent force simulated by a
robotic manipulandum
varm
Applied question Will motor training of rehab
patients with robotic contacting forces transfer
to natural movements where no contact is
present? Basic question Does the nervous system
partition different load sources and learn them
separately, and if so what is the sensory basis
of the segregation?
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SIMULTANEOUS CONTACTING AND NON-CONTACTING FORCES
Free
non-contact
Object
non-contact contact
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• How does the nervous system partition the net
  load into contacting and non-contacting
  components?
• Two type of force receptors
• ? Golgi tendon organ ? total muscle force
• (object
  on hand
• 
  non-contact on arm)
• ? Cutaneous ? local contact
  force
  (object on hand)

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• How does the nervous system partition the net
  load into contacting and non-contacting
  components?
• Hypothesized CNS computation
• ? GTO ? Cutaneous
  Non-contacting
• (total force) (contact force)

estimate of contacting load
estimate of non-contacting load