Short Communication: How low can you go: Spatial frequency sensitivity in a patient with pure alexia  

Oleh:

Starrfelt, Randi ; Nielsen, Simon ; Habekost, Thomas ; Andersen, Tobias S.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 126 no. 2 (2013), page 188-192.
Topik: Pure alexia; Word length effect; Word reading; Case study; LBL-reading; Spatial frequency sensitivity; Contrast sensitivity
Fulltext: 126_02_Starrfelt.pdf (803.44KB)

Isi artikel

Pure alexia is a selective deficit in reading, following lesions to the posterior left hemisphere. Writing and other language functions remain intact in these patients. Whether pure alexia is caused by a primary problem in visual perception is highly debated. A recent hypothesis suggests that a low level deficit – reduced sensitivity to particular spatial frequencies – is the underlying cause. We tested this hypothesis in a pure alexic patient (LK), using a sensitive psychophysical paradigm to examine her performance with simple patterns of different spatial frequency. We find that both in a detection and a classification task, LK’s contrast sensitivity is comparable to normal controls for all spatial frequencies. Thus, reduced spatial frequency sensitivity does not constitute a general explanation for pure alexia, suggesting that the core deficit in this disorder is at a higher level in the visual processing stream.

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