Level of Processing Effects on Hemispheric Asymmetries With Kana (Japanese Phonetic Symbols) Words

Hatta, Takeshi

doi:10.1080/00207598308247480

Cited by 8 publications

(3 citation statements)

References 20 publications

(18 reference statements)

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“…In contrast to CVC stimuli in English, a three-character kana string need not be encoded as a single unit because it is pronounced exactly as it is spelled, character by character. Although there was a robust RVF-LH advantage for identifying these kana stimuli in Japanese speakers (see also Hatta, 1983; Ohtani, 1984), there were no hemispheric differences in QE scores. Instead, the QE scores were equally high on LVF-RH, RVF-LH, and redundant bilateral trials, consistent with sequential processing of the individual letters and with the results for nonletter symbols reported in the present experiment.…”

Section: Resultsmentioning

confidence: 99%

Are hemispheric strategy differences independent of the level of performance?

Hellige¹,

Marks²

2001

Neuropsychology

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Studies requiring identification of consonant-vowel-consonant (CVC) nonwords have suggested that attention is distributed more slowly or sequentially across the letters when they are presented to the right hemisphere than to the left hemisphere. Two experiments investigated whether hemispheric differences in processing strategy would be reduced with reductions of hemispheric differences in accuracy. The magnitude of visual field differences in accuracy was controlled by manipulating exposure duration, and the effect was observed on visual field differences in processing strategy. For both CVC identification (Experiment 1) and identification of nonletter symbols (Experiment 2), hemispheric strategy differences were independent of differences in accuracy. Both quantitative and qualitative hemispheric differences in processing visual displays appear to depend on the nature of the stimuli and the nature of the processes they invoke.

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Section: Resultsmentioning

confidence: 99%

Are hemispheric strategy differences independent of the level of performance?

Hellige¹,

Marks²

2001

Neuropsychology

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“…Hatta postulated two types of visual tasks which involve different levels of information processing, one referred to as a simple recognition task and the other referred to as a higher-order processing task. Hatta (1982Hatta ( , 1983b hypothesized that there are two types of higher-order information processing, one relying more on the linguistic code (L-type) and the other relying on the nonlinguistic (imagery) code (I-type). The former calls for stronger engagement of the left hemisphere while the latter calls for a greater contribution from the right hemisphere.…”

Section: Discussionmentioning

confidence: 99%

Effects of Perceptual Quality and Task Difference on the Hemispheric Processing of Word Stimuli

Hatta¹

1986

Int J Psychol

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Three experiments were conducted to examine the effects of stimulus exposure duration, retinal eccentricity, visual noise and task differences (physical classification and semantic classification) on the processing of Kana (Japanese phonetic symbol) words presented to the left and right visual fields. The primary findings of the three experiments were as follows. The right visual field advantage was found in the shorter exposure duration but no visual field difference was shown in the longer exposure duration condition (experiment 1). Stimulus presentation to large and small retinal eccentricity conditions revealed similar visual field difference (experiment 2). No significant visual field difference was shown in both clear and blurred stimulus presentation conditions (experiment 3). Semantic classification task revealed a right visual field advantage in all experiments whereas no visual field difference was shown in physical classification task in experiments 2 and 3. These results were dmussed in terms of spatial frequency hypothesis and levels of processing hypothesis.The technique of lateral tachstoscopic presentation is generally employed as a means of assessing functional hemispheric asymmetries. This involves inherent sensory limitations. Stimuli have to be projected to retinal areas of reduced acuity for a duration less than the critical duration over which the time-intensity reciprocity holds in visual acuity tasks. Sergent (1982aSergent ( , b, 1983 and Sergent and Bindra (1984) proposed that the cerebral hemispheres are preferentially sensitive to different spatial frequency spectral components of stimuli. For example, Sergent (1983) reported a series of experiments using a Posner-type letter matchmg task which examined this stimulus spatial frequency hypothesis more systematically. She manipulated stimulus exposure duration, Requests for reprints should be sent to T. Hatta,

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“…The Mixed condition seemed to require a much deeper level of processing compared to the Kanji and the Arabic conditions. A number of the previous research has clarified the effect of levels of processing on hemispheric asymmetry (e.g., Bryden & Allard, 1976;Cohen, 1983;Hatta, 1983;Moscovitch, 1979Moscovitch, , 1986. In addition, a number of research have reported that a right hemisphere more involved in recognizing Kanji characters (e.g., Endo, Shimizu, & Nakamura, 1981;Hatta, 1977Hatta, , 1978Hatta, Katoh, & Aitani, 1983;Sasanuma, Itoh, Mori, & Kobayashi, 1977), compared to that for recognizing other scripts (e.g., alphabets, Arabic numerals and Kanas).…”

mentioning

confidence: 99%