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Correlations Between Different Aspects of Lateralization, and with Gender
Published in Robert Miller, Axonal Conduction Time and Human Cerebral Laterality, 2019
In auditory tests of lateralization a variety of the relationships with handedness are reported. Several studies show, as with visual tests, that there is a reduced left hemisphere advantage in left handers. Zurif and Bryden (1969), using two different dichotic tests found that right handers, and left handers without familiar sinistrality had the expected left hemisphere advantage. Left handers with a family history of left handedness were equally divided between left and right hemisphere dominance. In other words, as with several results with visual stimuli, there was a shift to the right hemisphere but no overall majority of right hemisphere dominance even in this selected group. A similar result was obtained with accuracy of report as the dependent measures as when using the percentage of subjects with advantage to each hemisphere. Shankweiler and Studdert-Kennedy (1975) found that the degree of right ear advantage for CV syllable recognition correlated with measures of the degree of right handedness. Natale (1977) used a dichotic listening test involving short rhythms, with recognition of already-presented rhythms as the response measure. Male and female subjects were graded according to their degree of handedness. A right ear advantage was detected correlating in degree with degree of dexterity. Graves (1983) and Iaccino and Sowa (1989) also found that right ear advantages in dichotic tests were reduced in left handers.
Autism Spectrum Disorder
Published in Ivanka V. Asenova, Brain Lateralization and Developmental Disorders, 2018
Most studies have reported not only a greater frequency of left-handedness but also of mixed-handedness. In a series of studies, Bishop [10] found dramatically increased incidence of left- and mixed-handedness in autistic children in comparison with typically developing children of the same age. Similar results of increased incidence of non-right-handedness (left- and/or mixed-handedness) have been obtained by other researchers [8, 14, 22, 23, 110, 113].
Whiz kids and learning curves
Published in Allan Peterkin, Alan Bleakley, Staying Human During the Foundation Programme and Beyond, 2017
In addition, some learners are verbal (all about meaning making through words) others favour learning through the senses; for example, visual sources of information. Learning styles also include differences such as left-handedness. Here is an account from a Canadian trainee:
Handedness of healthy elderly and patients with Alzheimer’s disease
Published in International Journal of Neuroscience, 2020
Joseph J. Ryan, David S. Kreiner, Anthony M. Paolo
Worldwide estimates of hand dominance reflect a greater right- (85% to 90%) compared to left-hand (10% to 15%) preference among humans, with males showing higher rates of left-handedness than females [1]. In the United States between 1910 and 1980 the rate of left-handedness increased among the general population and different prevalence rates were documented across ethnicities. After 1970 the highest rate of left-handedness was recorded for Native Americans followed in descending order by Hispanics, Caucasians, Blacks, and Asians [2]. It is important to keep in mind that responses to multi-item questionnaires indicate that hand preference ranges along a continuum. When a strict classification standard is utilized to identify strongly right- and strongly left-handed individuals, a substantial number of persons are classified as mixed-handers [1].
Left-handedness in cardiac surgery: who’s right?
Published in Acta Chirurgica Belgica, 2020
K. Cathenis, J. Fleerakkers, W. Willaert, P. Ballaux, D. Goossens, R. Hamerlijnck
The exact percentage of people that are left-handed is unknown, but is estimated at 10% [1]. The distribution of left-handedness in medical disciplines is also unknown but is believed to be less common among surgeons [2]. Anecdotal evidence indicates that left-handedness can produce problems that are not always understood or accepted by right-handed surgeons, especially during surgical training [3]. Nonetheless, there is a paucity of literature describing potential issues regarding left-handedness in surgery. A survey by Adusumilli et al. highlights that inconveniences related to laterality may have important consequences. Ten out of 68 surgeons felt that they were at a disadvantage during their career with regards to hiring or promotion because of their laterality. Three surgeons considered leaving surgery at some point in their career, and 1 out of the 68 left-handed surgeons considered changing specialty (cardio-thoracic surgery) because of laterality related frustrations [3]. Another recently published survey among surgeons showed significantly more difficulty and less comfort in training left-handed trainees. Main reasons were translating right-handed techniques and physical limitations of an environment optimized for right-handed mechanics [4].
Hair Whorl Direction: The Association with Handedness, Footedness, and Eyedness
Published in Developmental Neuropsychology, 2020
Murat Çetkin, Selin Bayko, Tunç Kutoğlu
The human body demonstrates asymmetric features in a structural and functional sense. Handedness, footedness, and eyedness constitute the functional symmetric differences in humans. Handedness (hand preference) is an evident marker of cerebral dominance (Misra, 2007). Handedness, defined as an individual’s preference to use one of his/her hands more than the other hand in special tasks, may have a natural or biological basis (Ghayas & Adil, 2007). In humans, right-handedness is more common than left-handedness. This is a universal reality that does not depend on racial and geographical variables (McManus, 2009). Another parameter considered in the representation of cerebral dominance is footedness (foot preference) (Elias, Bryden, & Bulman-Fleming, 1998; Kalaycıoğlu, Kara, Atbaşoğlu, & Nalçacı, 2008). Footedness is the preference of one lower limb more than the other one in a motor activity (Grouios, Hatzitaki, Kollias, & Koidou, 2009). Footedness was reported to be less affected by social training (Gabbard & Iteya, 1996). The functional mechanism and neural origin of eyedness (ocular dominance) is relatively less known. The brain receives image-related impulses from the binocular visual field. However, an individual usually prefers to use one of his/her eyes more than the other one in certain tasks. This tendency is called eyedness and while performing certain tasks that require the use of one eye, those with right eye dominance prefer to use their right eyes, and those with left eye dominance prefer to use their left eyes (Maples, 2002; Suttle et al., 2009).