Hemineglect

1
Hemineglect

• Group 5
• Hans Tim Joey Sumanth
• COGS 175

2
Outline

• What is hemineglect (Tim)
• Examples of hemineglect (Tim)
• Deepness of Neglect (Hans)
• Neuroanatomy (Hans)
• Neglect and consciousness (Sumanth)
• Neglect and attention (Sumanth)
• Artists with neglect (Sumanth)
• Neglect and rational thinking (Joey)
• Neglect and reality (Joey)
• Summary (Joey)

3
What is Hemineglect?

• Hemineglect is due to right parietal damage and
  results in contralateral neglect
• When a patient has hemineglect, they do not
  attend to their left visual field, since it is
  the right parietal lobe that is damaged
• It is not that the patients cannot see it, its
  simply an inability to attend to it
• They do not know they have it

4
Examples of Neglect

• Line bisection task
• Cancellation task
• Copying task

5
Visual Search Eye Tracking

• Here the subject tries to find the Ts among the
  other shapes

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Gradient of Neglect

• Neglect does not perfectly divide the entire
  visual field, rather it varies between
  individuals and the attended to or not attended
  to portions of the VF does not have sharp
  boundaries

7
The Deepness of hemineglect

• Memories are also selectively attended to
• For example, a woman who went to the Piazza in
  Milan, was asked what she saw when looking at the
  Pope, she reported only seeing things in her
  right visual field
• Mirror Agnosia
• Occurs in half of neglect patients

8
Neuroanatomy of Neglect

• Classically, hemineglect has been associated with
  lesions in the posterior parietal cortex,
  particularly the inferior parietal lobe (IPL) or
  tempo-parietal junction(TPJ)
• Also, some researchers agree that damage to
  subcortical regions are also responsible for
  neglect, like the thalamus and basal ganglia

9
Hemineglect and Consciousness

• Its not the seat of consciousness, because
  people with hemineglect are conscious, but their
  consciousness is dramatically altered.
• Individuals with right parietal damage but
  symptoms of neglect still failed in many visual
  working memory tasks (Berryhill 2008)

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Hemineglect and Attention

• Normal conscious people visually attend to both
  the left and right sides, where hemineglect
  patients attend only to the right
• SPECT (Single photon emission-computed
  tomography) study. (Jodzio 2008)
• Hypoprofusion _at_ OFC, Parietal, Striatum,
  Thalamus.
• These areas together form higher thinking and
  attentional functions.
• Deficits in cortico-striatothalamo-cortical loop.

11
Hemi-neglected Art
Lovis Corinth Expressionism 1858-1925 Stroke
1911 Damage R lt-- Pre Stroke Self-portrait
with skeleton, 1896.
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Post Stroke Work
'Piéta', drypoint by Lovis Corinth,
1920 Corinth had a stroke in his right
hemisphere in 1911 and his work was not not the
same till his death 13 years later.
13
Apple tree in blossom, 1922
Difference Internal vs External Visualization?
-Lean -Detail
14
Alterations to Rational Thinking

• 10 of people with hemineglect have anosognosia
• It is a denial of their deficit

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Hemineglect Reality

• Hemineglect patients have a different perspective
  in the world when compared to those with no
  neglect and normal consciousness

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Summary

• Neglect is usually a result of damage to parietal
  areas from stroke.
• This leads to lack of attention and analysis of
  contralaterial visual field.
• Modification of attention leads to changes in
  consciousness.

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Questions?

• Treatments drug treatments and behavioral
  interventions
• Difficult because everyone has varying degrees
  due to various parts being damaged
• Small subject pool to help design effective
  treatment options

18
Citations

• Dietrich, A.  Functional neuroanatomy of altered
  states of consciousness the transient
  hypofrontality hypothesis.  Consciousness and
  Cognition, 12, 231-256, 2003.
• Husain, Masud. "Hemineglect." Scholarpedia. 25
  Apr. 2007. Institute of Cognitive Neuroscience
  University College, London. 11 Mar. 2008
  http//www.scholarpedia.org/article/Hemineglect.
• Laukkanen, Hannu. "ASSESSMENT AND MANAGEMENT OF
  NEUROLOGIC UNILATERAL SPATIAL INATTENTION/NEGLECT
  SYNDROME." 2006. Pacific University College of
  Optometry. 11 Mar. 2008 lthttp//images.google.com/
  imgres?imgurlhttp//www.opt.pacificu.edu/ce/catal
  og/16593-NO/Fig3aNew.jpgimgrefurlhttp//opt.paci
  ficu.edu/ce/catalog/16593-NO/16593-NO.htmlh428w
  432sz89hlenstart32um1tbnidj8RUlwooU1CDK
  Mtbnh125tbnw126prev/images3Fq3Danosognosi
  a26start3D2026ndsp3D2026um3D126hl3Den26sa
  3DNgt.
• Ramachandran, V.S. "Parietal Lobes and Neglect."
  University of California, San Diego. 10 Oct.
  2007.
• "Visual Neglect." 12 Nov. 2006. University of
  Minnesota. 11 Mar. 2008 lthttp//www.psych.umn.edu/
  courses/fall06/hes/psy5062/lectures/Lecture11-12-n
  eglect-ppt.pdfgt.
• Me, Berryhill, and Olson Ir. "The Right Parietal
  Lobe is Critical forVisual Working Memory."
  Neuropsychologia (2008). PubMed. Giesel SE,La
  Jolla. 11 Mar. 2008. Keyword visual neglect.
• K, Jodzio, Lass P, Nyka W, Gasecki D, Bandurski
  T, and Scheffler J."Cerebral Blood Flow SPECT
  Imaging in Right Hemisphere-DamagedPatients with
  Hemispatial Neglect. a Pilot Study."
  Neuropsychologia(2008). PubMed. Giesel SE, La
  Jolla. 11 Mar. 2008. Keyword bloodflow, visual
  neglect.
• H, Bazner, and Hennerici Mg. "The Consequences of
  Stroke for theArtist Lovis Corinth." Dev Med
  Child Neurol (2006). PubMed. GieselSE, La Jolla.
  11 Mar. 2008. Keyword artists, neglect.