[The estimation of the direction of uniform and nonuniform movement and the alpha-rhythm EEG]

In experiments with 7 human observers the recognition of side and direction of the even and non-even (compensating the magnification factor) light motion in the left or right visual hemifield and to or from the fixation point was studied. The onset of the movement coincided with different phases of the EEG alpha-wave in the occipital region. In a control study stimuli were presented irrespectively to alpha-wave phases. Synchronization of non-even motion with some of the alpha-wave phases lead to an increase of its recognition probability and relative shortening of the response latency for directions from the center of gaze, while opposite directions became worse recognized and evoked relatively long-latency responses. Recognition of the even motion was not changed in experiment in compare with control. The obtained date are discussed in relation to Pitts and McCulloch (1947) hypothesis on a periodical (with alpha-wave frequency) scanning wave spreading over the visual cortex.