Alexia and quadrant-amblyopia: Reading disability after a minor visual field deficit
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Alexia and quadrant-amblyopia : Reading disability after a minor visual field deficit. / Habekost, Thomas; Starrfelt, Randi.
I: Neuropsychologia, Bind 44, Nr. 12, 2006, s. 2465-2476.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Alexia and quadrant-amblyopia
T2 - Reading disability after a minor visual field deficit
AU - Habekost, Thomas
AU - Starrfelt, Randi
PY - 2006
Y1 - 2006
N2 - Reading difficulties caused by hemianopia are well described. We present a study of alexia in a patient (NT) with a milder visual field deficit. The patient had suffered a cerebral haemorrhage causing damage to the left occipital cortex and underlying white matter. NT's text reading was slow and prone to error, but recognition of single letters was preserved. Single word reading was accurate, but slower than normal. On perimetric testing NT initially showed an upper right quadrantanopia, but by attending covertly to this quadrant he could achieve luminance detection except in a small scotoma above the reading line. A whole report experiment showed that letter perception was severely compromised in the quadrant, consistent with cerebral amblyopia. On follow-up testing one and a half year post stroke, a clear spontaneous recovery had occurred, reflected in improved text reading with close to normal eye movements. Still, subtle reading difficulties and oculo-motor abnormalities remained. Overall, the study shows how amblyopia in one quadrant can lead to a characteristic form of alexia.
AB - Reading difficulties caused by hemianopia are well described. We present a study of alexia in a patient (NT) with a milder visual field deficit. The patient had suffered a cerebral haemorrhage causing damage to the left occipital cortex and underlying white matter. NT's text reading was slow and prone to error, but recognition of single letters was preserved. Single word reading was accurate, but slower than normal. On perimetric testing NT initially showed an upper right quadrantanopia, but by attending covertly to this quadrant he could achieve luminance detection except in a small scotoma above the reading line. A whole report experiment showed that letter perception was severely compromised in the quadrant, consistent with cerebral amblyopia. On follow-up testing one and a half year post stroke, a clear spontaneous recovery had occurred, reflected in improved text reading with close to normal eye movements. Still, subtle reading difficulties and oculo-motor abnormalities remained. Overall, the study shows how amblyopia in one quadrant can lead to a characteristic form of alexia.
KW - Faculty of Social Sciences
KW - Capacity
KW - Extinction
KW - Putamen
KW - Subclinical
KW - TVA
U2 - doi:10.1016/j.neuropsychologia.2006.04.007
DO - doi:10.1016/j.neuropsychologia.2006.04.007
M3 - Journal article
VL - 44
SP - 2465
EP - 2476
JO - Neuropsychologia
JF - Neuropsychologia
SN - 0028-3932
IS - 12
ER -
ID: 1097397