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NEUR 2600 Lecture Notes - Dorsal Root Ganglion, Proprioception, Dorsal Root Of Spinal Nerve


Course Code
NEUR 2600
Ian Whishaw

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Healthy young man, lost the compete ability to do anything
Learned to walk, learned to drive a car
Couldn't have any feedback from joints or muscles or anything
Everything was done with vision.
Largely recovered via looking at his joints
When he was eighteen, working as butcher, cut his finger. Finger got red, got fatigued,
had trouble walking, couldn't get out of bed, no one knew what to do
Ian Waterman
Wrote a book (Pride and a Daily Marathon)
10 cases of this condition around the world
Jonathon Cole
Wipes out the dorsal root ganglion cells
Proprioception = the body's eyes.
B6 poisoning
Oliver Sacks
Proprioception loss
Hapsis - not only touch, but being touched
When he was stimulating the brain, the somatosensory cortex, people would report
sensations from mouth and face, head, body,
Somatosensory homunculus
Wilder Penfield
The density of receptors on the body relate to the area of the sensory cortex given to a body part.
Rodents have a representation of their vibrissae in sensory cortex
Look at glucose utilization in the barrels, and only one is being used
Map of whiskers in the brain, in this way
Barrel Cortex
There isn't an entire homunculus
There is for muscles, skin (slow), skin fast) and joints/pressure.
John H. Kaas
Arises from brain processes for attention.
Your attention system provides where your eyes move
If something that happens that's new, your eyes move there
Peggy was surprised when she drew half a cat, she thought she drew the whole thing
Curious phenomena
Not a vision deficit, they can see what they’ve done once attention is brought to it
Dogs can get this too
What's wrong with neglect is that the attention is impaired.
Neglect-right parietal lesions
Edward Taub
Restraint induced therapy
Alex Pacheco
Brain and Behavior Page 1
One of the monkeys got quite sick, got permission from the courts, to do an experiment
to look at the cortex, to see if it got no sensory feedback
Normal pattern illustrated by a normal face
In the control monkey, an area of the somatosensory cortex represents the arm
and face
In the deafferented monkey, the area of the somatosensory cortex that formerly
represened the arm has been taken over by expansion of the face area
This expansion is illustrated by an elongated face
Pon's experiment
Essentially developed for people who worked on cannons, and they had to fire them in
the dark
Someone modified their technique and turned it into a language
Braille - the language of the somatosensory system
Information from the secondary somatosensory cortex contributes to the dorsal stream by
specifying the movement used for grasping a target
Information from the secondary somatosensory cortex contributes to the ventral stream by
providing information about object size and shape
Brain and Behavior Page 2