Visual laterality and the acuity gradient: potential artifacts and control procedures |
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| Authors: | J B Hellige |
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| Institution: | 1. Institute of International Rivers and Eco-Security, Yunnan University, Kunming 650500, China;2. Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China;3. Yunnan Key Laboratory of International Rivers and Transboundary Eco-security, Kunming 650091, China;4. School of Geography and Tourism, Qufu Normal University, Rizhao 276826, China;1. Hamilton Glaucoma Center, Shiley Eye Institute, Viterbi Family Department of Ophthalmology, University of California San Diego, La Jolla, California;1. LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. DWI - Leibniz Institute for Interactive Materials and Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Forckenbeckstraße 50, 52074 Aachen, Germany;1. NIHR Biomedical Research Centre for Ophthalmology, Moorfields Eye Hospital and University College London, London, United Kingdom;2. Allergan plc, Irvine, California;3. Medisoft Limited, Leeds, United Kingdom;4. Allergan Singapore Pte. Ltd., Singapore;5. Allergan plc, Marlow, United Kingdom;6. Allergan plc, Madison, New Jersey;7. Gloucestershire Hospitals NHS Foundation Trust, Cheltenham, United Kingdom;8. Medical Sciences, Plymouth University, Plymouth, United Kingdom |
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| Abstract: | As visual stimuli are moved away from the fixation point toward either side, perceptibility falls off rapidly. This acuity gradient can influence visual half-field differences if the two sides (or ends) of a stimulus do not provide equal amounts of task-relevant information. In general, performance should be better in the visual field with the more informative side of the stimulus closer to the fixation point. Kirsner and Schwartz (1986, Brain and Cognition, 5, 354-361) discuss implications for experiments using words. The present article considers the assumptions involved in an explanation of visual half-field differences in terms of the visual acuity gradient and offers guidelines for the design of experiments using letters, faces (and other nonverbal stimuli), and words. Special attention is given to the interpretation of Visual Field X Task Variable interactions and to the use of words with letters arranged vertically. It is concluded that, with sufficient care in their design and interpretation, visual laterality experiments are an important converging operation for the study of cerebral hemisphere asymmetry. |
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