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PubMed1977

Cerebral dominance in disabled readers, good readers, and gifted children: search for a valid model.

A group of 10 reading-disabled children with average intelligence were compared with 11 good readers of average intelligence and 12 academically accelerated, gifted children on their recognition of words presented tachistoscopically under simultaneous, bilateral viewing conditions. The poor readers were inferior in right-field performance compared with the gifted children and good readers. With IQ as a covariate, the poor readers produced a higher left-field score and a lower visual-field difference score in comparison with the gifted children. It is argued that the skills needed to become literate are not isomorphic biologically with general linguistic competence. The results suggest (1) that reading acquisition involves enhanced left-hemisphere decoding of written language and (2) that reading disability is related to the prevalence of a right-hemisphere-based perceptual coding strategy.

Child↗
PubMed1976

Making sense of cerebral dominance and syndromes of the nondominant hemisphere.

Knowing the special function of each half of the brain is important to the clinician. If he doesn't understand what damage to the nondominant hemisphere can do, he may mistake the resulting syndrome for a psychiatric illness or generalized dementia, and the patient won't get proper treatment and counseling. The tendency is to think of dominance in terms of language, but other functions are asymmetrically located even though their input and output are bilateral. Generally, lesions in the left hemisphere cause problems with language and those in the right disrupt visual and spatial skills, attention, and emotional behavior. By far the most common syndrome in right hemisphere lesions is neglect of the left side. A patient may show lack of concern about his illness or he may deny that he is sick or even that the left side of his body belongs to him. Patients with left hemisphere lesions may neglect the right side but rarely to this extreme.

Aged↗
PubMed1983

Tickle perception as micro-experience of pleasure: its phenomenology on different areas of the body and relation to cerebral dominance.

We examined the tickle sensitivity of 46 female psychology students with reference to different areas of the body and cerebral dominance. Analysis indicated a significant difference between two halves of the body for latency and not for duration. The dimensional approach, as we have suggested for other research on cerebral dominance, singled out for both latency and duration of tickle three groups of dominance: right, left, and nondominant subjects.

Adult↗
PubMed1977

Handedness in relation to direction and degree of cerebral dominance for language.

In so far as ear asymmetries on dichotic listening reflect cerebral dominance for language, the present evidence indicates a progressively decreasing incidence of left hemisphere dominance in right handed, mixed handed and left handed individuals. In the absence of a family history of sinistrality there are no indications that the degree of dominance is reduced in left handers or mixed handers when compared to right handers, nor that right hemisphere dominance is less securely established than left hemisphere dominance. Among strong left handers with a family history of sinistrality, however, ear difference scores are significantly smaller, indicating reduced lateralization or bilateral representation of language in such individudals. This applies equally in left dominant and right dominant left handers.

Adolescent↗
PubMed1993

Hypopigmentation, anomalous cerebral dominance and seasonality.

This paper proposes a prenatal seasonal hypopigmentation influence associated with anomalous cerebral dominance that occurs during the winter or early spring. A possible mechanism would be seasonal changes in sex hormone levels that affect the activation and inactivation of DNA by reversible methylation. The proposed prenatal seasonal hypopigmentation effect might be relevant to dyslexia, Prader-Willi syndrome, breast cancer, Alzheimer's and Parkinson's disease. Putative chromosomal loci associated with the proposed seasonal mechanism would be 15q11-13 (dyslexia and Prader-Willi syndrome), 21q region (breast cancer and Alzheimer's disease) and 19p region (pigmentation gene).

Alzheimer Disease↗
PubMed1976

Integration of post-exposural directional scanning and cerebral dominance explanations of lateral differences in trachistoscopic recognition.

Post-exposural directional scanning and cerebral dominance are major postualtes which account for lateral differences in tachistoscopic perception. These ideas can be intergrated when tachistoscopic perception is viewed as a short-term memory task. Briefly exposed stimuli not only have to be scanned, but also rehearsed, subvocally, before they can be encoded. Since most Ss are left-hemisphere dominant for language, scanned information arriving in the right hemisphere has to be sent to the left hemisphere for rehearsal. This transmission effects a loss of scanned information because it is held in a rapidly dissipating storage. These ideas account for lateral differences found with vertically and horizontally oriented targets, but methodological considerations are discussed which indicate that these notions are more clearly demonstrable with the former than latter displays .

Dominance, Cerebral↗
PubMed1999

Stuttering children and the probability of remission--the role of cerebral dominance and speech production.

OBJECTIVE: The identification of critical characteristics which might predict whether childhood stuttering will become chronic. Part of the study investigates the relationship between hearing and central processing of acoustic stimuli, cerebral dominance and the clinical course of the stuttering. METHODS: A prospective study of 79 stuttering children aged 3-9 years. The subjects were examined with regard to their cerebral dominance in various tests of laterality, their peripheral hearing and their ability to discriminate sound using the dichotic discrimination test according to Uttenweiler (V. Uttenweiler, Dichotischer Diskriminationstest für Kinder, Sprache Stimme Gehör 4 (1980) 107-111). Results were correlated with the probability of remission of stuttering. Comparisons were made with a control group of 18 children of kindergarten age with normal speech. The period of investigation was 18 months. RESULTS: Seventy-two children underwent follow-up examinations. Of these, 36 achieved fluency of speech. The results of the dichotic discrimination test showed no relation to the rate of remission. When the relationship between handedness and stuttering was investigated, it was found that left-handed children had a significantly poorer chance of attaining speech fluency. CONCLUSIONS: The Uttenweiler test allowed no prognostic evaluation of the future course of stuttering in the age group studied, though auditory dominance was not completely developed in a majority of the 3-6 year-old children. Handedness, however, appears to be related to the probability that stuttering will become chronic.

Case-Control Studies↗
PubMed1980

Does the 'torque test' measure cerebral dominance in adults?

The direction of drawing a circle, labeled the 'torque test' (Blau, 1977), was evaluated in 74 normal adults (age 14 to 44 yr.) as a predictor of both handedness and cerebral dominance on the dichotic listening test. The results indicate that torque is related to handedness but not to lateralization of language. We suggest that circle-drawing by adults is dependent more on the muscle mechanics of the hand than on cerebral dominance.

Adolescent↗
PubMed1983

Muscular tone at rest: relationship with cutaneous pleasurable experience, an interpretation according to the dimensional approach to cerebral dominance.

This study examined some aspects of the relationship between muscular tone at rest and a particular kind of pleasurable tactile stimulation (tickle) in the light of the dimensional approach to cerebral dominance. Electromyographic scores, latencies, and tickle durations for six muscles and corresponding skin areas were taken both on the right and left sides of the body from 40 female students in psychology. There was an inverse relationship between muscular tone at rest and sensitivity to tickle stimulation, which is lower (long latency and brief duration of perception) when the levels of muscular tone increase. So we hypothesize that the muscular system (especially because the correlations of tone and latency are positive) plays a role through the afferents of inhibition of tactile pleasurable experience. This role is more evident for the left side of the body. The dimensional approach to cerebral dominance on the basis of myographic score identified three groups of subjects (right, left, and non-dominant). The subjects classified as right-dominant on the basis of myographic score show a longer duration of tickle on the right half of the body than on the left and longer latency on the left. The left-dominant subjects do not show any difference between the two halves of the body in duration of tickle but show longer latency on the left side. The non-dominant subjects show also no difference between the two sides of the body for both tickle duration and latency.

Adult↗
PubMed1984

Writing hand posture and cerebral dominance for speech.

Levy and Reid's claim (1976, 1978) that writing hand/posture is predictive of cerebral dominance was examined in patients who had undergone bilateral sodium Amytal speech testing. Contrary to their prediction, inverted writers showed the same pattern of speech representation as did straight writers.

Adolescent↗