By Alexander Leff, Randi Starrfelt (auth.)
This e-book is a finished evaluation of the most got issues of studying: hemianopic, natural and valuable alexia. The authors overview the diagnostic standards for every of the different sorts of ailment, and the efficacy of the healing experiences that experience tried to remediate them. the various theoretical versions of grownup interpreting, which principally leisure on how the studying process responds to damage, also are mentioned and evaluated. Focal mind harm because of stroke and mind tumors are mentioned extensive as are the results of dementia on reading.
This e-book begins with a bankruptcy on common studying, by way of chapters on hemianopic alexia, natural alexia and principal alexia, every one established within the comparable manner, with: an outline of the situation; a historic overview of circumstances thus far; psychophysics; attention of the causative lesions; proof from useful imaging experiences on sufferers and, most significantly, a evaluate of the proof base for treating every one situation. eventually, there's a bankruptcy on how sufferer facts has expert how we predict approximately reading.
Alexia: analysis, remedy and Theory is aimed toward neuropsychologists (both experimental and clinical), neurologists, speech therapists and others who care for sufferers whose examining has been tormented by an obtained mind harm, in addition to scholars learning language disorders.
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Extra resources for Alexia: Diagnosis, Treatment and Theory
Below are two visual field plots from a patient with an incomplete, homonymous hemianopia, using the HAF 10-2 threshold test. 6 show the printouts from the two visual fields of a single subject with a right-sided hemianopia. Both eyes were tested in turn, and visual acuity was corrected for near vision using a lens placed in front of the test eye while the other eye was masked with a patch. The 10-2 notation means that the extent of the field tested was 10° around the fixation point with a grid that is offset from both the horizontal and vertical meridians.
2°. The test is thresholded, and the numbers are in a log scale. That is, each test point is visited more than once with different intensities of light being used. 90 DB P < 1 % PATTERN DEVIATION <5% NEURO-OPHTHALMOLOGY <2% NATIONAL HOSPITAL <1% QUEEN SQUARE LONDON WC1N 3BG © 1994–98 HUMPHREY SYSTEMS HFA II 750-6314-REV. 2 Fig. 6 10° left eye assessment for a patient (same as Fig. 5) with an incomplete, right-sided homonymous hemianopia at each point, and these numbers appear in the top row of field maps in numerical form (a) and are interpolated to produce a grayscale plot (b).
This patient is likely to have a more severe form of hemianopic alexia than the patient with the leftsided complete homonymous hemioanopia  (Fig. 8), at least when reading English. Description and Diagnosis 43 a LE RE b c Lt Lt d Fig. 9 Patient with a very focal (cortical) left occipital stroke causing a right, paracentral homonymous scotoma. (a) 30° visual fields (HFA) from the patient’s left (LE) and (RE) right eyes. Note the normal blind spots ~15° to the left and right of fixation (crosshair) and the small, homonymous scotoma affecting the right, parafoveal inferior quadrant.
Alexia: Diagnosis, Treatment and Theory by Alexander Leff, Randi Starrfelt (auth.)