Occipital Lobe
external image occipital.jpg




Location and Functions

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  • The occipital lobe is located in the back of the brain.
  • The main function of the occipital lobe is visual processing.
  • It is also helps with shape, movement and color recognition.
  • The primary visual cortex (Brodmann area 17) is located in the occipital lobe which receives information from the retinas in our eyes.

Damage and Disorders of the Occipital Lobe

  • Damages to the occipital lobe can lead to some vision loss.
    • Even if only one occipital lobe is damaged, a person can suffer from the same amount of a loss of vision in both eyes.
  • Disorders of the occipital lobe can lead to visual hallucinations and illusions, color agnosia, movement agnosia, agraphia, and alexia.
    • Visual hallucinations and illusions can be caused by lesions in the occipital region.
      • Visual illusions can include objects appearing a different size than what they really are, a lack of color in objects or an abnormal coloring of an object.
    • Color agnosia is the inability of a person to name or identify certain colors.

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    • Movement agnosia is the inability of a person to recognize the movement of an object.
    • Agraphia is the inability or loss of ability to write and spell.
    • Alexia is the complete loss of the ability to read. It is also called word-blindness.

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References

http://www.waiting.com/brainanatomy.html#anchor2684498
http://biology.about.com/od/anatomy/p/occipital-lobes.htm
http://www.psychdaily.com/encyclopedia.php?term=Occipital+lobe
http://www.neuroskills.com/tbi/boccipit.shtml
http://www.sciencedaily.com/articles/o/occipital_lobe.htm
http://brainmind.com/Dyslexia43.html
http://brainmind.com/Agraphia.html
http://library.thinkquest.org/19910/data/occipital_lobe.htm
http://www.drugs.com/dict/color-agnosia.html
http://www.neuroskills.com/images/occipital.jpg