Possibilities of Using Electroencephalography in Cerebral Dominance Study

2009 ◽  
Vol 24 (S1) ◽  
pp. 1-1
Author(s):  
S. Danoiu ◽  
M. Danoiu
Keyword(s):  
Right Hemisphere ◽  
Average Frequency ◽  
Cerebral Dominance ◽  
International Standards ◽  
Noninvasive Method ◽  
Left Handed ◽  
Left And Right ◽  
Beta Rhythms ◽  
Dominance Study ◽  
Beta Frequency

Aims:The purpose of this study was to distinguish electroencephalographic possible typical features at left handed children as against to right children, and also to find out possible range aspects which can suggests the central dominance for language.Method:Electroencephalographic (EEG) band was recorded on an EEG device (Pegasus Digital EEG-EMS GmbH - Austria) according to the international standards.Subjects:Sample I: 8 left handed children (av. 9.38 SD 3.53 yrs); Sample II: 18 right handed children (av. 11.06 SD 2.48 yrs).Using the data obtained by Fast Fourier Transform (FFT), we performed comparisons regarding the index, and the average frequency for delta, theta, alpha, and beta bands. The comparisons was performed for each subject, for each band, and pair of electrode between left and right hemisphere, between left and right children for every electrode, and for the two hemispheres.Results:We have found significant differences on EEG features between left and right children regarding both index, and frequency of the main cerebral rhythm, the most meaningful been at alpha, and beta rhythms. For instance the beta frequency was higher on the left recordings, mostly at right children, where seven of the electrode pairs presents significant differences.Conclusions:In contrast with classical, and virtual analysis the Digital EEG, and FFT test is a method that can be useful to study the cerebral dominance. The advantage of this method pleads the fact that firstly it is a noninvasive method, and despite other sophisticated functional techniques remains the most inexpensive.

Asymmetries in Ear Movements and Eyebrow Raising in Men and Women and Right- and Left-Handers

1995 ◽  
Vol 80 (3_suppl) ◽  
pp. 1147-1154 ◽  
Author(s):  
Chris Code
Keyword(s):  
Sex Differences ◽  
Right Hemisphere ◽  
The Other ◽  
Modern Humans ◽  
Environmental Sounds ◽  
Men And Women ◽  
Left Handed ◽  
Left And Right ◽  
By Products

The abilities to move ears and eyebrows were examined in 442 subjects (204 men, 238 women) categorized as right-handed ( n = 382) and left-handed ( n = 60, including mixed and ambidextrous-handed subjects). Approximately 22% could move one or the other ear and about 18% could move both ears simultaneously, but significantly more men could move both ears simultaneously. Significantly more men than women were able to move both the left and right eyebrow and the left ear. No differences were observed between right- and left-handers. Significant contingency correlations were observed between raising eyebrows and moving ears. Results are discussed with reference to a possible left ear-right hemisphere advantage for localising environmental sounds, primitive ear-moving abilities no longer functional in modern humans, and epiphenomenal by-products of other adaptive sex differences.

Cerebral Lateralization of Global-Local Processing in Left- and Right-Handed People

2005 ◽  
Vol 100 (3) ◽  
pp. 734-742 ◽  
Author(s):  
Mohammad Ali Goodarzi ◽  
Mohammad Reza Taghavi ◽  
Mohammad Reza Zoughi
Keyword(s):  
Visual Field ◽  
Left Visual Field ◽  
Right Hemisphere ◽  
Local Processing ◽  
Cerebral Lateralization ◽  
Left Handed ◽  
Left And Right ◽  
The Right ◽  
Paradigm Analysis ◽  
Local Superiority

Cerebral lateralization of global-local processing of 70 left-handed and 70 right-handed students was compared using a computerized global-local task in a half-visual field paradigm. Analysis showed that left-handed individuals were slower than right-handed individuals in processing Globally Directed stimuli presented to the left visual field (right hemisphere). In addition, left-handed individuals showed smaller local superiority in the left hemisphere to the right-handed individuals. These findings are more consistent with Levy's prediction of spatial inferiority of left-handed individuals than Geschwind and Galaburda's or Annett's hypotheses.

Postcallosotomy language impairments in patients with crossed cerebral dominance

1990 ◽  
Vol 72 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Kimberlee J. Sass ◽  
Robert A. Novelly ◽  
Dennis D. Spencer ◽  
Susan S. Spencer
Keyword(s):  
Left Hemisphere ◽  
Verbal Memory ◽  
Right Hemisphere ◽  
Cerebral Dominance ◽  
Language Impairments ◽  
Content Type ◽  
Left Handed ◽  
Buccofacial Apraxia ◽  
Clinically Significant ◽  
Fine Print

✓ Language impairments were reviewed retrospectively in patients who underwent partial or total corpus callosum section for medically refractory secondary generalized epilepsy. Postoperatively, four of 32 patients had clinically significant language impairments that were not present prior to the operation. All involved primarily verbal output (speech and writing) and spared verbal comprehension. Written language skills (reading and spelling), verbal memory, and verbal reasoning abilities were impaired to varying degrees. These impairments were associated with crossed cerebral dominance. Three patients with severe speech difficulties after surgery were right hemisphere-dominant for speech and were right-handed. One left hemisphere speech-dominant, left-handed patient was agraphic after surgery, but spoke normally. It is concluded from these data and from other reports in the literature that three syndromes of language disturbance may follow callosotomy. The first, involving speech difficulty but sparing writing, is attributable to buccofacial apraxia. The second involves speech and writing difficulties and occurs in right hemisphere-dominant right-handed patients. The third involves dysgraphia with intact speech and occurs in left hemisphere-dominant left-handed patients.

A Dissociation between the Representation of Tool-use Skills and Hand Dominance: Insights from Left- and Right-handed Callosotomy Patients

2005 ◽  
Vol 17 (2) ◽  
pp. 262-272 ◽  
Author(s):  
Scott H. Frey ◽  
Margaret G. Funnell ◽  
Valerie E. Gerry ◽  
Michael S. Gazzaniga
Keyword(s):  
Left Hemisphere ◽  
Tool Use ◽  
Right Hemisphere ◽  
Hand Dominance ◽  
Conceptual Level ◽  
Left Hand ◽  
Left Handed ◽  
Contralateral Hand ◽  
Left And Right ◽  
The Right

The overwhelming majority of evidence indicates that the left cerebral hemisphere of right-handed humans is dominant both for manual control and the representation of acquired skills, including tool use. It is, however, unclear whether these functions involve common or dissociable mechanisms. Here we demonstrate that the disconnected left hemispheres of both right- and left-handed split-brain patients are specialized for representing acquired tool-use skills. When required to pantomime actions associated with familiar tools (Experiment 2), both patients show a right-hand (left hemisphere) advantage in response to tool names, pictures, and actual objects. Accuracy decreases as stimuli become increasingly symbolic when using the left hand (right hemisphere). Tested in isolation with lateralized pictures (Experiment 3), each patient's left hemisphere demonstrates a significant advantage over the right hemisphere for pantomiming tool-use actions with the contralateral hand. The fact that this asymmetry occurs even in a left-handed patient suggests that the left hemisphere specialization for representing praxis skills can be dissociated from mechanisms involved in hand dominance located in the right hemisphere. This effect is not attributable to differences at the conceptual level, as the left and right hemispheres are equally and highly competent at associating tools with observed pantomimes (Experiment 4).

Differentiation Between Left and Right Hemisphere Forms of Intelligence

2006 ◽  
Author(s):  
Cristina Isaacs ◽  
Nichole McWhorter ◽  
Teri McHale ◽  
Lorrie N. Shiota ◽  
Henry V. Soper
Keyword(s):  
Right Hemisphere ◽  
Left And Right

Patterns of Cognitive Test Performance As Functions of the Lateral Localization of Cerebral Abnormalities in the Temporal Lobe

1957 ◽  
Vol 103 (433) ◽  
pp. 758-772 ◽  
Author(s):  
Victor Meyer ◽  
H. Gwynne Jones
Keyword(s):  
Test Performance ◽  
Right Hemisphere ◽  
Cognitive Test ◽  
Temporal Relationships ◽  
Verbal Tasks ◽  
Specific Locus ◽  
Left And Right ◽  
Spatio Temporal ◽  
Cognitive Test Performance ◽  
Lateral Localization

Various investigations into the effects of brain injury on psychological test performance (Weisenburg and McBride, 1935; Patterson and Zangwill, 1944; Anderson, 1951; McFie and Piercy, 1952; Bauer and Becka, 1954; Milner, 1954) suggest the overall conclusion that patients with left hemisphere lesions are relatively poor at verbal tasks, while those with right-sided lesions do worst at practical tasks, particularly the manipulation of spatial or spatio-temporal relationships. Heilbfun's (1956) study confirmed that verbal deficits result from left-sided lesions but his left and right hemisphere groups produced almost identical scores on spatial tests. In so far as these workers paid attention to the specific sites of the lesions, their findings indicate that the pattern of test performance is a function of the hemisphere in which the lesion occurs rather than of its specific locus.

Lifted-Weight Difference Thresholds as a Function of Hand

1978 ◽  
Vol 46 (1) ◽  
pp. 175-178 ◽  
Author(s):  
William A. Siders ◽  
Harry Hoffman ◽  
Bradley B. Glanville
Keyword(s):  
College Students ◽  
Weight Changes ◽  
Weight Difference ◽  
Left Handed ◽  
Perceived Weight ◽  
Left And Right ◽  
Difference Thresholds

A study was conducted to determine if the two hands of right-handers are differentially sensitive to changes in perceived weight. Using the method of limits, the left and right hands of 20 college students were tested at each of three reference weights: 90, 100, and 110 gm. Results indicated that, over-all, difference thresholds for the two hands were not reliably different, though a trend did emerge toward greater right-handed sensitivity to weight changes at smaller weights and greater left-handed sensitivity at greater weights.

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