scholarly journals Left‐handed musicians show a higher probability of atypical cerebral dominance for language

2020 ◽  
Vol 41 (8) ◽  
pp. 2048-2058 ◽  
Author(s):  
Esteban Villar‐Rodríguez ◽  
María‐Ángeles Palomar‐García ◽  
Mireia Hernández ◽  
Jesús Adrián‐Ventura ◽  
Gustau Olcina‐Sempere ◽  
...  
Keyword(s):  
Cerebral Dominance ◽  
Left Handed

scholarly journals Dichotic words listening test: technical aspects and results in normal right-handed individuals

1994 ◽  
Vol 52 (2) ◽  
pp. 204-209 ◽  
Author(s):  
Ana Regina Caner-Cukiert ◽  
Arthur Cukiert
Keyword(s):  
Cerebral Dominance ◽  
Listening Test ◽  
Left Handed ◽  
Listening Tests ◽  
Msec Interval ◽  
Normal Individuals ◽  
Hemisphere Dominance ◽  
Four Blocks ◽  
Right Ear Advantage ◽  
The Right

Dichotic listening tests have been being used in an increasing frequency to determine in a non-invasive way the cerebral dominance in right- and left-handed patients. This is especially relevant when surgery in eloquent brain areas is being contemplated. A Portuguese version of the dichotic words listening test was developed based mainly on Wexler's protocol. It consisted of 15 pairs of words with a stimulus dominance lower than 50%. They were recorded using natural voice and time and intensity synchronization by means of a specialized software. Each pair of words was presented twice in different channels within each block. The items were randomized and presented with a 300 msec interval between each trial. Four blocks of 30 pairs of words each were created, totalizing 120 trials. In the scoring process, the words heard over the right and left ears were wrote down. The number of times each word was heard over each ear was computed and their values subtracted yielding a partial score for each specific word pair. This process was repeated for all stimuli pair and a final score for right and left predominance was then reached. Thirty-two right handed normal individuals underwent the test 93.8% showed a right ear advantage. These results are very similar to the actual left hemisphere dominance rate in a right-handed population.

Cerebral Dominance and Its Relation To Psychological Function

PEDIATRICS ◽  
1963 ◽  
Vol 31 (3) ◽  
pp. 395-395
Author(s):  
RANDOLPH K. BYERS
Keyword(s):  
Left Hemisphere ◽  
Cerebral Dominance ◽  
Language Function ◽  
Psychological Function ◽  
Language Functions ◽  
Left Handed ◽  
The Subject

This little book is a review of and contribution to the subject of language and its relationship to cerebral dominance. In general it emphasizes that in right-handed people language function is nearly regularly and fairly strictly localized to the left hemisphere. In left-handed and clearly ambidextrous people there is still a tendency for language to be localized in the left hemisphere, but its localization is not as complete, and various language functions may escape in injury to one hemisphere. Recovery tends to be more complete following acute lesions of the left hemisphere in predominantly left-handed individuals.

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.

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.

scholarly journals Cerebral Dominance in Left-Handed Subjects

Cortex ◽  
1971 ◽  
Vol 7 (1) ◽  
pp. 19-48 ◽  
Author(s):  
H. Hécaen ◽  
J. Sauguet
Keyword(s):  
Cerebral Dominance ◽  
Left Handed

Lateralization of Sensory and Motor Functions in Human Neonates

1982 ◽  
Vol 54 (3_suppl) ◽  
pp. 1151-1158 ◽  
Author(s):  
Giovanni Cioni ◽  
Graziella Pellegrinetti
Keyword(s):  
Genetic Factors ◽  
Cerebral Dominance ◽  
Left Handed ◽  
The Family ◽  
Group A ◽  
Group B ◽  
The Right ◽  
Human Neonates ◽  
Sensory Functions ◽  
Marked Tendency

Lateral differences in some motor and sensory functions were examined in 89 full-term normal newborns, 2 to 4 days old. They were divided in two groups, according to the cerebral dominance in the family: Group A (70 subjects), offspring of right-handed parents and siblings, and Group B (19 subjects), with at least one parent or sibling left-handed or ambidextrous. Only subjects of Group A showed a marked tendency to spend more time with the head to right as opposed to the left, to turn right after release from the midline position, to have their heads right 5 min. later, to lead with the right leg on the placing response. The two groups were significantly different from each other on these tests. Differences were not observed for stepping, tactile responses, asymmetrical tonic neck reactions in either of the two groups. The results confirm the existence of lateral differentiations of neurological functions in the newborn and stress the presence of genetic factors in these phenomena.

Single molecule optical diffraction: A tool for understanding the structure of triple stranded left-hand helical cellulose

1989 ◽  
Vol 47 ◽  
pp. 1024-1025
Author(s):  
George C. Ruben ◽  
William Krakow
Keyword(s):  
Single Molecule ◽  
Helical Structure ◽  
Optical Diffraction ◽  
Maximum Diameter ◽  
Primary Cell Wall ◽  
Cellulose Synthesis ◽  
Left Hand ◽  
Left Handed ◽  
Freeze Dried ◽  
Diffraction Patterns

Tobacco primary cell wall and normal bacterial Acetobacter xylinum cellulose formation produced a 36.8±3Å triple-stranded left-hand helical microfibril in freeze-dried Pt-C replicas and in negatively stained preparations for TEM. As three submicrofibril strands exit the wall of Axylinum , they twist together to form a left-hand helical microfibril. This process is driven by the left-hand helical structure of the submicrofibril and by cellulose synthesis. That is, as the submicrofibril is elongating at the wall, it is also being left-hand twisted and twisted together with two other submicrofibrils. The submicrofibril appears to have the dimensions of a nine (l-4)-ß-D-glucan parallel chain crystalline unit whose long, 23Å, and short, 19Å, diagonals form major and minor left-handed axial surface ridges every 36Å.The computer generated optical diffraction of this model and its corresponding image have been compared. The submicrofibril model was used to construct a microfibril model. This model and corresponding microfibril images have also been optically diffracted and comparedIn this paper we compare two less complex microfibril models. The first model (Fig. 1a) is constructed with cylindrical submicrofibrils. The second model (Fig. 2a) is also constructed with three submicrofibrils but with a single 23 Å diagonal, projecting from a rounded cross section and left-hand helically twisted, with a 36Å repeat, similar to the original model (45°±10° crossover angle). The submicrofibrils cross the microfibril axis at roughly a 45°±10° angle, the same crossover angle observed in microflbril TEM images. These models were constructed so that the maximum diameter of the submicrofibrils was 23Å and the overall microfibril diameters were similar to Pt-C coated image diameters of ∼50Å and not the actual diameter of 36.5Å. The methods for computing optical diffraction patterns have been published before.

Left handed GDPs and students

BDJ ◽  
1995 ◽  
Vol 178 (12) ◽  
pp. 448-448 ◽  
Author(s):  
J M Brown
Keyword(s):  
Left Handed

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20502
Author(s):  
Behrokh Beiranvand ◽  
Alexander S. Sobolev ◽  
Anton V. Kudryashov
Keyword(s):  
Transmission Line ◽  
Terahertz Radiation ◽  
Transmission Lines ◽  
Software Package ◽  
Optical Pulses ◽  
Capacitively Coupled ◽  
Voltage Difference ◽  
Left Handed ◽  
Microwave Transmission ◽  
Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

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