Exp. Brain Res. 36, R1-R25 (1979) Experimental Brain Research @ Springer-Verlag 1979 European Brain and Behaviour Society (EBBS) Abstracts of the Annual General Meeting in Paris, September 22-26, 1979 R3 Sigma-Movement Perception and Optokinetic Nystagmus Elicited by Stroboscopically Illuminated Stereopatterns B. Adler and O.-J. Griisser Department of Physiology, Freie Universit/it Berlin, D-1000 Berlin Stroboscopically illuminated periodic visual patterns seen with one or both eyes elicit an apparent movement perception (Sigma-movement) and an optokinetic nystagmus (Sigma-OKN) when eye pursuit movements are initiated at an angular speed Ve = Ps- fs [degrees. s - q Ps is the period of the stimulus pattern, fs the flash frequency. The Sigma-movement is attributed to the interaction between efference copy signals and the afferent visual information. One of the levels of interaction of these two signals was assumed to be beyond the level of retinotopic projection. (1) Sigma-phenomena are also present with periodic spatial stimulus patterns seen only with the cyclopean retina (24 vertical stereostripes). The random dot patterns presented to the left and the right eye were stroboscopically illuminated by polarized light and seen through glasses with crossed polarization filters (flash frequency fs, 1-40 flashes, s-l). The angular speed Ve of the
Experimental Brain Research – Springer Journals
Published: Aug 1, 1979
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