“Your body is not just a vehicle for yourpages.ucsd.edu/~mboyle/COGS11/COGS11-website/pdf... ·...
Transcript of “Your body is not just a vehicle for yourpages.ucsd.edu/~mboyle/COGS11/COGS11-website/pdf... ·...
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“Your body is not just a vehicle for your brain to cruise around in. The
relationship is perfectly reciprocal: Your body and your brain exist for each other.
… Meaning is rooted in agency (the ability to act and choose), and agency
depends on embodiment.”
Sandra Blakeslee and Matthew Blakeslee – The Body Has a Mind of It’s Own
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Journal of Comparative and Physiological Psychology 1963, Vol. 56, No. 5, 872-876
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human brain holds and continuously updates an internal map of the body
Using tendon vibration distort volunteers’ brains rapidly
adjusted the processing of touch information to match information from proprioception –the position to the limbs relative to the body.
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Blindfolded subjects held their left index finger with their right arm.
Vibration was applied to the right arm on the biceps tendon.
…. a subjective elongation of the left index finger.
The triceps vibration induced a subjective flexion of the right arm
and, consequently, a subjective shrinking of the left index.
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Mary ET Boyle COGS 11 Minds and Brains
The case of Tom and Philip...
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Mary ET Boyle COGS 11 Minds and Brains
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Phantom Limb – From “https://www.youtube.com/watch?v=1mHIv5ToMTM
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There is a secondary somatosensory cortex (region S2) (Brodmann Areas 40 and 43)
Area is responsive to light touch, pain, visceral sensation and tactile attention. Very large receptive areas.
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Insula and Amygdala
Both are involved in the mediation of emotion and emotional states
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intraparietal sulcus (IPS)
perceptual-motor
coordination (for directing eye
movements and reaching) and
visual attention
processing symbolic numerical
information
visuospatialworking memory
interpreting the intent of others
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GSR and its Mediators
electrical conductance of skinsympathetic nervous systeminsula mediatesamygdala influences
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Apotemnophilia, a disorder that blurs the distinction between neurology and psychiatry, is characterized by the intense and longstanding desire for amputation of a specific limb. Here we present evidence from two individuals suggestive that this condition, long thought to be entirely psychological in origin, actually has a neurological basis. We found heightened skin conductance response to pinprick below the desired line of amputation. We propose apotemnophilia arises from congenital dysfunction of the right superior parietal lobule and its connection with the insula.
NeuroReport 19:1305-1306 c 2008 Wolters Kluwer Health |LippincottWilliams &Wilkins.
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B.C. was a 63‐year‐old right‐handed man who reported that since the age of 4 years he had desired bilateral lower limb amputations. Specifically, he indicated that he wanted his right leg to be amputated four inches below his hip joint and his left leg to be amputated two inches below the knee, and he stated that these parts felt as if they were ‘just not’ his. He attributed his feelings about his legs to ‘a possessive mother’, ‘an abusive boss’ and a desire to ‘fit in’. He noted that recently the left‐side desire had become particularly strong, while conversely his desire for a right‐sided amputation had decreased. He contacted us a year later to report that the desire for an amputation on his right side had almost completely disappeared. Several months after this, HEHAD AN ELECTIVE LEFT BELOW‐KNEE AMPUTATION AND SUBSEQUENTLY
STATED THAT HE NO LONGER HAD ANY DESIRE FOR A RIGHT LEGAMPUTATION.
McGeoch, et al (2011) J Neurol Neurosurg Psychiatry 82:1314
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B.C. 63 y/o man – desires both legs amputated; left leg below the knee; right leg below the thigh.
XX
BC
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Changes in skin conductance recording in response to pinprick above and below desired levels of amputation in the legs. B.C. wanted both legs amputated. Individuals with apotemnophilia show significant increases SCR below the level of amputation.
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Body map integration failure
“They can feel the body being touched, but it does not integrate into their sense of body image…They know
the limb is part of their body, but it's 'more' than it should be. It should be gone.”
Paul McGeoch, UCSD
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A.O. was a 29‐year‐old right‐handed man who desired a right mid‐tibial amputation. He recalled that a ‘strong desire’ for the amputation of his right leg around the middle of his tibia started around the age of 12 years and had been constant since then. He denied a sexual motivation, but stated that rather the presence of his right leg made him feel ‘over‐complete’ and that he simply wanted it ‘gone’. He had cut off the distal phalanx of his right middle finger after reading on the internet that this might alleviate his desire for amputation of his leg. He had no a priori desire to amputate this phalanx and its removal did not have an impact on the strength of his desire for his leg to be amputated. He readily acknowledged that his feelings about his leg were not normal. On neurological examination, he reported that pinprick was, possibly, slightly duller in a stocking distribution from the mid‐level of his right tibia down. He also commented that at other times the same area felt ‘more sensitive’ than the other side. A month after visiting us, he irrevocably damaged his right leg with dry ice, thus necessitating a right below‐knee amputation.
McGeoch, et al (2011) J Neurol Neurosurg Psychiatry 82:1314
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Magnetoencephalography
MEG measures changes
in magnetic fields that are correlated to neuronal firing.
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Where is the brain malfunction?
Right superior parietal lobule (rSPL)Linked to people’s representation
of their own body
Tap foot to see which areas of the brain are
responsive. Use MEG to visualize
neuronal activity.
Touch the normal limb right parietal lobe
showed activity;
Touch the limb they want amputated
no right parietal lobe activity.
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Site of desired amputation and right SPL activation detected by MEG in response to tapping of the feet.
Data from: Apotemnophilia – the Neurological Basis of a ‘Psychological’ Disorder.
McGeoch, Paul, Brang, David, Song, Tao, Lee, Roland, Huang, Mingxiong, and Ramachandran, Vilayanur.
Available from Nature Precedings (2009)http://hdl.handle.net/10101/npre.2009.2954.1
Image from: Bisley & Goldberg (2010) Annu. Rev. Neurosci.
superior Parietal Lobe
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sPL Activation in BIID Case
Paul D. McGeoch, David Brang, Tao Song, Roland R. Lee, Mingxiong Huang, V. S. Ramachandran
Control
Patient
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First, M. B. Psychological Medicine, 2004, 34, 1–10
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Psychological Medicine, 2004, 34, 1–10
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Anatomical Identity Crisis
Amputation to establish their “true identity”
“I felt like I was in the wrong body—that I am only complete with both my arm and leg off on the right side”
Is BIID similar to gender identity disorder?
First, M. B. Psychological Medicine, 2004, 34, 1–10
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Does psychotherapy work?
First, M. B. Psychological Medicine, 2004, 34, 1–10
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What about SSRIs?
First, M. B. Psychological Medicine, 2004, 34, 1–10
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Are we really sure –which came first?
Desire could change circuitry
Circuitry could create desire.
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Anorexia Nervosa
misperception of true body size
extreme control of food intake
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Grunwald, M Scientific American Mind 2004
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Overestimated Boundaries
both right parietal lesion patients and anorexia patients
overestimated their body boundary
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Case, L. K., et al (2011) Exp Brain Res
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Case, L. K., et al (2011) Exp Brain Res
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Kaye, W. H. et al (2009) Nature Reviews| Neuroscience volume 10
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Kaye, W. H. et al (2009) Nature Reviews| Neuroscience volume 10
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Body DysmorphicDisorder
perceived flaw
obsession to the point of inability to function
properly in the world
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SOMATOFORM AND FACTITIOUS DISORDERS
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SOMATOFORM AND FACTITIOUS DISORDERS
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SOMATOFORM AND FACTITIOUS DISORDERS
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Summary
The function of the right parietal lobe in
body image disorders
The possible correlation of other disorders with right
parietal damage cases
What can happen when these areas are
damaged by head trauma or stroke
Brain lesion studies provide evidence of brain regions that help mediate body
representations
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The Future of these Studies
Look at attention confounds
The better we understand these
disorders, the better we can provide treatment
for those afflicted
Create studies with more controls
Treatments exist for the reintegration of body
image in anorexic patients
Create more behavioral tasks
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Review Anatomy:
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Citations