Poggel D A, Müller-Oehring E M, Kasten E, Bunzenthal U, Sabel B A, 2002, "Training-induced patterns of visual-field recovery: changes of objective and subjective visual-field size in brain-lesioned patients" Perception 31 ECVP Abstract Supplement
Training-induced patterns of visual-field recovery: changes of objective and subjective visual-field size in brain-lesioned patients
D A Poggel, E M Müller-Oehring, E Kasten, U Bunzenthal, B A Sabel
Topographical patterns of functional recovery over six months of visual restitution training were observed, and changes of objective and subjective visual-field size were compared.
Nineteen patients with post-genicular lesions of the visual system performed visual restitution training. During pre-training and post-training baseline measurements, objective visual-field size was determined by perimetric tests, and subjective scotoma size was specified in a standardised chart of the right and left eye. Correlations between objective and subjective visual-field size and changes in both variables over the treatment period were determined.
Even before training, subjective visual-field size correlated with perimetric measurements. Stimulus detection in objective visual-field tests increased over the training period, while subjective defect size decreased. Form and size of the scotoma were adequately represented in most patients, with foveal defects being perceived as larger than more peripheral parts of the scotoma. Training-induced improvement could also be recognised in patients' drawings. Thus, visual restitution training increases intact visual-field size in objective visual-field tests but also affects the subjective representation of the defect. Both measures reflect the architecture of the visual system because patterns of recovery follow the laws of the cortical magnification factor.
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