Summary
Quantitative studies of latencies and trajectories of eye-head movements during visual search and fixation in patients with occipital hemianopia show that (1) the latency of head movement is bilaterally increased, with significantly greater delays in movements toward the blind side; (2) the compensatory eye movements (CEMs) during head movements toward the blind side have increased velocity; (3) these CEMs entail a non-vestibular anticipatory component; and (4) head movements toward the blind side are comprised of multiple steps similar to staircase eye movements documented in previous studies. Hemianopic patients seemingly simplify search and fixation strategies by minimizing or entirely eliminating head movements and relying on eye movements instead.
Zusammenfassung
Quantitative Untersuchungen der Augen- und Kopfbewegungen, die von Patienten mit occipitaler Hemianopsie zum Erfassen und Fixieren visueller Ziele verwendet werden, zeigen: (1) beidseits verlängerte Latenzen für Kopfbewegungen, bei einer signifikant zusätzlich verlängerten Latenz für Kopfbewegungen zum blinden Halbfeld; (2) erhöhte Geschwindigkeit der kompensatorischen Augenbewegungen für Kopfbewegungen zum blinden Halbfeld; (3) eine nicht-vestibuläre, antizipatorische Komponente dieser kompensatorischen Augenbewegungen bei Kopfwendungen zum blinden Halbfeld, und (4) multiple treppenförmige Kopfbewegungen, ähnlich den treppenförmigen sakkadischen Augenbewegungen dieser Patienten bei Wendungen zum blinden Halbfeld. Patienten mit homonymer Hemianopsie vereinfachen und sichern offenbar ihre Strategien zum Aufsuchen und Fixieren visueller Ziele dadurch, daß sie ihre Kopfbewegungen zugunsten von Augenbewegungen eliminieren.
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On leave from the Department of Neurology, University of Hamburg, FRG, with support from Deutsche Forschungsgemeinschaft Bonn, FRG
On leave from the Department of Neurology, University of Bern, Switzerland, with support from Geigy Jubilaeumsstiftung Basel and Schweizerische Stiftung für Medizinisch-Biologische Stipendien
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Zangemeister, W.H., Meienberg, O., Stark, L. et al. Eye-head coordination in homonymous hemianopia. J Neurol 226, 243–254 (1982). https://doi.org/10.1007/BF00313397
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DOI: https://doi.org/10.1007/BF00313397