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Previous research has shown that decisions about odd numbers take longer than decisions about even numbers (the "odd efect"). It has also been shown that females are better at processing linguistic stimuli and males are better at processing spatial stimuli. In the present experiment, male and female subjects made odd versus even the classification judgments on numbers presented visually in three different formats: digits, number words, and dot patterns. Males showed longer decision times for odd numbers only when the numbers were presented in dot pattern format. Females showed this effect only when the stimuli were presented in the word format. These results suggest that differential speed of respose to odd and even numbers is found most strongly when the stimuli are presented in a format which is processing more efficiently by the subjects. This finding may imply that the effect is being produced by some higher order cognitive process, based on higher order representations that do not necessarily involve linguistic or verbal coding.
EN
Our previous study performed on subjects with no brain damage suggested that processes involved in the storage of sensory information are lateralized to the right hemisphere. The present research aimed at verifying this hypothesis by studying the effect of unilateral temporal lobe lesion on performance in a sensory information storage test. Seventeen patients who had undergone a unilateral temporal lobectomy for the relief of intractable epilepsy (8 subjects - left hemisphere damage, 9 subjects - right hemisphere damage) and 11 normal control subjects with no brain damage were tested. The subjects were presented with geometrical Vanderplas type figures exposed in pairs, each for 100 ms, one afther another, with short (50 ms and 500 ms) and long (3,000 ms) interstimulus intervals (ISI). The task of the subjects was to judge whether the second stimulus was the same as, smaller or bigger then the first one. The first stimulus in each pair was exposed unilaterally, randomly in the left (LVT) or right (RVT) visual field, and the second one in the center of the screen. In short ISI condition the RH-damaged group performed worse then both the control group and the LH-damaged group. In long ISI condition the RH-damaged group did not differ from the controls .On the contrary th LH-damaged group did not differ significantly from the controls in any ISI condition. The results shows that temporal lobe structures are involved in time limited storage of sensory information. Moreover, they provide further evidence for the right-hemispheric locus of this storage.
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