Format

Send to

Choose Destination
PLoS One. 2014 Jul 7;9(7):e100898. doi: 10.1371/journal.pone.0100898. eCollection 2014.

An eye movement study on the role of the visual field defect in pure alexia.

Author information

1
Neurologische Universitätsklinik Freiburg, Freiburg, Germany.
2
Kognitionswissenschaft, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany; Institut für Deutsche Sprache (IDS), Mannheim, Germany.
3
Università degli Studi di Trento, Scienze della Cognizione e della Formazione, Trento, Italy.
4
Universitäts-Augenklinik Freiburg, Freiburg, Germany.
5
Kognitionswissenschaft, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany.

Abstract

Pure alexia is a severe impairment of word reading which is usually accompanied by a right-sided visual field defect. Patients with pure alexia exhibit better preserved writing and a considerable word length effect, claimed to result from a serial letter processing strategy. Two experiments compared the eye movements of four patients with pure alexia to controls with simulated visual field defects (sVFD) when reading single words. Besides differences in response times and differential effects of word length on word reading in both groups, fixation durations and the occurrence of a serial, letter-by-letter fixation strategy were investigated. The analyses revealed quantitative and qualitative differences between pure alexic patients and unimpaired individuals reading with sVFD. The patients with pure alexia read words slower and exhibited more fixations. The serial, letter-by-letter fixation strategy was observed only in the patients but not in the controls with sVFD. It is argued that the VFD does not cause pure alexic reading.

PMID:
24999811
PMCID:
PMC4085070
DOI:
10.1371/journal.pone.0100898
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Public Library of Science Icon for PubMed Central
Loading ...
Support Center