Letter identification declines with increasing retinal eccentricity at the same rate for normal and dyslexic readers
| Autor: | Mary E. Farmer, Glen Berry, Barbara D’Entremont, Kevin Briand, Raymond M. Klein |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Adult
Male medicine.medical_specialty Visual acuity media_common.quotation_subject Experimental and Cognitive Psychology Fixation Ocular Audiology Developmental psychology Dyslexia Perception medicine Humans Attention General Psychology media_common medicine.disease Gaze Sensory Systems Retinal eccentricity Fixation point Form Perception Pattern Recognition Visual Reading Peripheral vision Fixation (visual) Female medicine.symptom Visual Fields Psychology |
| Zdroj: | Perceptionpsychophysics. 47(6) |
| ISSN: | 0031-5117 |
| Popis: | It has recently been claimed (Geiger & Lettvin, 1987; Perry, Dember, Warm, & Sacks, 1989) that the acuity/eccentricity function is flatter in dyslexics than in normal subjects, with dyslexics showing better performance in the periphery and worse performance-at-fixation. In these studies, all target letters were presented to the right of fixation, a procedural flaw inviting subjects to optimize performance by directing attention and/or gaze to the right of the designated fixation point. It is suggested that dyslexic and normal readers may differ in the degree to which they might adopt the optimal strategy in this situation. To overcome this problem, target letters were briefly presented at 16 randomly intermixed locations derived from the orthogonal combination of four eccentricities and four directions from fixation (above, below, right, left). The accuracy of letter identification declined with increasing eccentricity at the same rate for good and poor adult readers and dyslexic teenagers. This finding provides no support for the view that the acuity/eccentricity function might vary with and possibly cause differences in reading level. |
| Databáze: | OpenAIRE |
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