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We present two experiments demonstrating that: (i) the latency of perception of the position of a small visual target moving towards the fovea is shorter than that of the same target moving away from the fovea; (ii) the reaction time (RT) to onset of motion of the same type of target is also shorter when it moves towards the fovea; and (iii) the RT to onset… (More)
Eye fixation duration during discrimination of pairs of simultaneously presented computer generated random textures differing in 'grain' has been analyzed. Of the shortest duration are fixation periods preceded and followed by local saccades over the same texture and those preceded by local saccade and followed by crossing saccade shifting the eye to the… (More)
Tracing movements (hand-following the stationary contours of three two-dimensional figures: square, triangle and circle by means of a computer mouse-operated lightspot) were analyzed during five consecutive days. All three figures consisting of four (square, circle) or three (triangle) segments had the same circumference. Three parameters were chosen to… (More)
The process of selection of target points during voluntary eye movements when contoured polygonal shapes with open and closed angles are observed was analysed in humans by means of an eye recording technique. It has been found for both types of stimuli that the majority of fixation points where located at angles and that the mean value of distribution was… (More)
Central and occipital EEGs were recorded during one-dimensional eye-hand tracking in humans. A negative slow potential shift followed the commitment of tracking errors at electrode O1 and their correction both at O1 and C3. Error commitments were also followed by a relative decrease in alpha and beta-band power at O1, whereas their corrections followed a… (More)
In relaxed subjects sitting in darkness no difference in the duration of EEG alpha and non-alpha (mostly desynchronized) periods were found under conditions of open and closed eyes.
In humans sitting in darkness with open eyes the presence of EEG alpha and non-alpha epochs was detected automatically and the threshold of detection of a dim visual stimulus was measured under both conditions. No differences in threshold were found. However, the reaction times for stimulus detection during alpha epochs were significantly longer than during… (More)