Vision After Early-Onset Lesions of the Occipital Cortex: I. Neuropsychological and Psychophysical Studies
We analyzed the visual functions of two patients (MS, FJ) with bilateral lesion of the primary visual cortex, which occurred at gestational age 33 wk in MS and at postnatal month 7 in FJ. In both patients basic visual functions— visual acuity, contrast sensitivity, color, form, motion perception—are...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2002-01-01
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| Series: | Neural Plasticity |
| Online Access: | http://dx.doi.org/10.1155/NP.2002.1 |
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| Summary: | We analyzed the visual functions of two
patients (MS, FJ) with bilateral lesion of the
primary visual cortex, which occurred at gestational
age 33 wk in MS and at postnatal month 7
in FJ. In both patients basic visual functions—
visual acuity, contrast sensitivity, color, form,
motion perception—are similarly preserved or
modestly impaired. Functions requiring higher
visual processing, particularly figure-ground
segregation based on textural cues, are severely
impaired. In MS, studied longitudinally, the
deficits attenuated between the ages of 4.5 and 8
y, suggesting that the developing visual system
can display a considerable degree of adaptive
plasticity several years after the occurrence of a
lesion. In FJ (age 18:9 to 20:6 y), who is more
impaired, the recovery, if any, was less. |
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| ISSN: | 2090-5904 1687-5443 |