Profiles in visual movement detection and discrimination in dyslexics
Keywords:
motion detection and discrimination profile, dyslexia, magnocellular visual deficit.Abstract
Introduction: Visual processing in dyslexia may compromise reading development, this relationship is not adequately argued and inconsistencies in its interpretation still persist.
Objective: To characterize visual movement detection and discrimination profiles in dyslexics from a psychophysical and behavioral point of view.
Methods: The sample was defined as two groups of dyslexics and non-dyslexics. Assessment of motion detection and discrimination was carried out to characterize the visual perception of dyslexics.
Results: A profile of deficit in visual motion detection and discrimination and its components was found, which was characterized by a higher number of errors than successes during the detection and discrimination of orientation, speed and direction for very low spatial frequencies. Success in the task depended on the horizontality and orthogonal components of the movement. Psychophysical profiles were determined in which difficulties in orientation discrimination may include a deficit in shape detection and difficulties in speed discrimination include a deficit in visual sensitivity to motion detection. Both profiles were statistically inconsistent with difficulties in motion direction discrimination.
Conclusions: Movement detection and discrimination in dyslexics presents a profile that has no statistical implication or coherence with difficulties in movement direction discrimination. The difficulties found in dyslexics indicate not only a phonological deficit but also a deficit in the visual processing of movement.
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References
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