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Biomedical subjects

T Hatta

Publications and source records attributed to T Hatta.

At least 163 records · Page 9Linked to original sources
PubMed1981

Development of hemisphere specialization for tactile recognition in normal children.

8 boys and 8 girls at each three age levels (2nd-, 4th-, and 6th grade) performed a tactile-visual recognition task, in which a tactually palpated object shape had to be matched with its analogue on a visual display. The performances of the left and right hand were compared. The results indicated that the performance of the left hand was more accurate than that of the right hand for 6th grade children while no significant difference between hands emerged in 2nd- and 4th grade children. A sex difference was found, with the right hand superior to the left hand in females but not significantly different in males. These results are discussed in relation to the development of hemisphere specialization.

Child↗
PubMed1981

[Task differences in the tachistoscopic Kanji recognition and their relations to hemisphere asymmetries (author's transl)].

Two experiments were conducted to explore the hemispheric specialization for the visual recognition of Kanji. In Exp. I, effects of different processing strategies were examined. Reaction times obtained neither from physical identity matching nor phonological identity matching condition revealed any significant visual field differences. In Exp. II, hemispheric specialization for different levels of Kanji processing was investigated by those subjects who made both physical identity matching and semantic categorization matching. Results showed that RTs to the right visual field were shorter than that of the left in the semantic categorization matching, while no such significant visual field difference was revealed in the physical identity matching. Identical Kanji stimuli were used in both experiments to compare the relative strengths of the levels of processing and the effects of strategy on Kanji recognition. It is suggested from the present study that the effects of strategy in information processing is not strong enough to overcome the visual field difference while the visual field difference is strongly influenced by the levels of Kanji processing.

Cognition↗
PubMed1980

Comparison of lateral differences for digit and random form recognition in Japanese and Westerners.

In this study, a cross-cultural comparison reveals differences in lateralization of hemisphere functions, Japanese students showed visual field symmetry for random shape recognition, whereas English students showed a highly significant left visual field advantage. Both groups showed better right visual field identification for numbers, and for these stimuli no differences between the groups were found.

Adult↗
PubMed1980

Hemispheric asymmetries in a tactile thought task for normal subjects.

14 normal subjects were given two tactile-recognition tasks. Subjects were asked to match the tactually presented nonsense figures to the visual-recognition display on a Non-rotation task. On the Mental-rotation task subjects matched the tactile figures which were presented in various directions by means of mental rotation to the visual display. A greater superiority of the left hand on the Mental-rotation task was noted while on the Non-rotation task no differences between hands were shown. The right hemisphere may contibute more strongly to higher thought processes especially those which do not need verbal mediation.

Adolescent↗
PubMed1977

Lateral recognition of abstract and concrete Kanji in Japanese.

Abstract and concrete non-phonetic logographic symbols (Kanji) were unilaterally presented in either the left or right visual field. Subsequent recognition performance of 15 male and 15 female students was superior for both abstract and concrete Kanji in the left visual field. Concrete Kanji were more correctly recognized than abstract Kanji in the left visual field. These results suggest that the right hemisphere possesses some ability to process verbal materials.

Adult↗
PubMed1977

Hemispheric differences in a categorization matching task.

The laterality difference in the execution of the higher-order cognitive task, categorization utilizing a superordinate concept, was examined. The subjects decided whether the two stimuli serially presented in the right or left visual field came under an identical category. In Exp. I, outline drawing stimuli were used and the RVF condition superiority in latency in the "same" response and LVF condition superiority in the "different" responses were demonstrated. These results were similar to those in the previous physical matching task and suggested that a superordinate concept was not in use to execute the present task. In Exp. II, vertically written verbal stimuli were used and the RVF condition superiority in both the "same" and the "different" responses were demonstrated. These results would suggest the superiority of the left hemisphere in the higher-order cognitive tasks.

Cognition↗