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Akinetopsia

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by

Cynthia Frick

on 29 November 2012

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Transcript of Akinetopsia

CEREBRAL
AKINETOPSIA Cynthia Frick
and
Destiny Madewell A defect in the perception
of visual motion. http://www.youtube.com/watch?v=QW53fRQv3Zo Aka: Motion Blindness It is caused by injury
to the occipital lobe Sight consists of light reflected into the retina of the eye. That light is translated into images by the occipital lobe. In order to perceive depth and motion, the retina is constantly scanning the image. These movements are called saccades. In between each saccade, the brain links the eye movement and is perceived as motion. If the visual cortex is damaged,
the information between saccades
no longer constructs motion; only
still images refreshing sporadically. It would be like looking through a viewfinder In 1983 Josef Zilh treated a
woman who suffered a stroke
that damaged the middle
temporal area of her brain.
She then discovered that
she had the rare disease
of akinetopsia. Since then, scientist have
discovered that even
temporary inactivation
of this part of the brain
(by transcranial magnetic
stimulation) can cause
temporary motion blindness It can be caused by a side effect
of antidepressant drugs, a stroke,
or brain surgery. Ironically, it can
be corrected through brain surgery
or the discontinuation of
antidepressants.
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